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Nauplius, Volume: 30, Published: 2022
  • Description of a new species of brackish-water crab of the genus Ptychognathus Stimpson, 1858 (Crustacea: Brachyura: Varunidae) from southern Taiwan Original Article

    Hsu, Jhih-Wei; Shih, Hsi-Te; Li, Jheng-Jhang

    Abstract in English:

    Abstract The brackish-water crabs of the genus Ptychognathus Stimpson, 1858, the most diverse genus in the family Varunidae, inhabit the estuaries or seashores influenced by freshwater. Ptychognathus sakaii, a new species from Kenting, southern Taiwan, is described in this study, with a comprehensive key to the ten species of this genus from Taiwan. This new species is similar to its congeners, but can be distinguished mainly by the features of the carapace, ambulatory legs, and male first gonopods.
  • Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context Original Article

    Kawai, Tadashi; Kouba, Antonín

    Abstract in English:

    Abstract Detailed morphology of the first three postembryonic developmental stages (Stages I-III juvenile) in representatives from all four crayfish families, Austropotamobius torrentium (von Paula Schrank, 1803) (Astacidae), Procambarus virginalis Lyko, 2017 (Cambaridae), Cambaroides japonicus (De Haan, 1841 [in De Haan, 1833-1850]) (Cambaroididae) and Cherax destructor Clark, 1936 (Parastacidae) are described and the diagnostic characters for each family are indicated. A phylogenetic tree of freshwater Astacidea, based on these new diagnostic juvenile characters is constructed to suborder, superfamily and family levels, and compared with a molecular phylogenetic tree. The evolutionary history of maternal care in freshwater crayfish is discussed based on particular features of the postembryonic stages of each family. Using comparisons between the phylogenetic tree and global geo-history, the location and timing of the early evolution of maternal care in postembryonic development and the extension of this care are estimated.
  • Catalogue of terrestrial isopods (Isopoda, Oniscidea) from Peru, with new records of Circoniscus ornatus (Scleropactidae) and Ethelum americanum (Eubelidae) Original Article

    Ocampo-Maceda, Ana Teresa; Ruelas-Cabana, Carlos Miguel; López-Orozco, Carlos Mario; López-Tejeda, Evaristo Luciano

    Abstract in English:

    Abstract This work aims to list all known species of terrestrial isopods from Peru until September, 2020. Also, Circoniscus ornatus (Verhoeff, 1941) (Scleropactidae) and Ethelum americanum (Dollfus, 1896) (Eubelidae) are recorded for the first time from Nueva Alianza and Nuevo Sucre, Contamana, Loreto department, Peruvian Amazon rainforest.
  • Filling gaps in the biology of the endemic and threatened freshwater shrimp Macrobrachium candango (Caridea: Palaemonidae) through basic morphometric and reproductive approaches Original Article

    Nogueira, Caio Santos; Mossolin, Emerson Contreira; Ribeiro, Mauro César Lambert Brito; Mantelatto, Fernando Luis

    Abstract in English:

    Abstract Macrobrachium candango Mantelatto, Pileggi, Pantaleão, Magalhães, Villalobos and Álvarez, 2021 is an endemic shrimp species to the Brazilian Central-West region (Brasília, Federal District). The present study aims to analyze the relative growth, morphometry, morphological sexual maturity, and fecundity of this species. Specimens were collected from tributaries of the Paranoá Lake hydrographic basin, Brasília, during sporadic periods between 1983 and 2012. Relative growth was analyzed for different structures (carapace, abdomen, second abdominal pleura, merus, carpus, and propodus). The laterality and heterochely patterns were evaluated based on the dimensions of the propodus length. Fecundity was calculated as the average total number of eggs per female and egg size was measured to obtain the volume. There were differences in relative growth (p < 0.05) of the structures analyzed between juveniles and adults, and distinct allometric patterns were observed between the life stages, which could reflect the habit of these animals at each developmental stage. No pattern of laterality and heterochely was observed between the chelipeds of the animals analyzed (p > 0.05). The lack of laterality may indicate that this species directs energy to the smallest propodus when the largest propodus is injured. Egg volume ranged from 4.41 to 7.71 mm3, and fecundity ranged from 38 to 61 eggs, indicating a life cycle with abbreviated larval development. The characteristics presented herein are unprecedented for M. candango and present relevant information needed to assess the conservation status of this species, which is currently threatened.
  • Presence of the Pink shrimp Farfantepenaeus brasiliensis (Latreille, 1817) in the coastal lagoons of Uruguay (Crustacea: Decapoda: Penaeoidea) Original Article

    Silveira, Santiago; Fabiano, Graciela; Pereyra, Inés; Laporta, Martin; Scarabino, Fabrizio; Santana, Orlando; Márquez, Alejandro; Errico, Eugenia

    Abstract in English:

    Abstract Farfantepenaeus brasiliensis (Latreille, 1817) and Farfantepenaeus paulensis (Pérez Farfante, 1967), commonly known as pink shrimps, are two commercially important penaeid species caught by artisanal and industrial fisheries in the Southwestern Atlantic Ocean. The currently known southern distribution for F. brasiliensis extends to Rio Grande do Sul (Brazil), while F. paulensis reaches the coastal waters of Buenos Aires (Argentina), although Uruguay represents the southern limit of commercial captures for the latter. In the shrimp season of 2019 (February-May) the presence of F. brasiliensis was recorded together with F. paulensis in the brackish coastal lagoons of Uruguay (34º30’ to 34º50’S). A total of 143 specimens of F. brasiliensis and 152 of F. paulensis were analyzed evaluating morphological, morphometric and genetic differences. The presence of both species was validated based on morphological differences and sequencing the Cytochrome Oxidase I (COI) mitochondrial gene. Significant morphometric differences were found between both species, particularly, the larger rostral length in relation to the carapace and cephalothorax length in F. paulensis compared to F. brasiliensis. To our knowledge, this is the first confirmed record and commercial catch of F. brasiliensis in Uruguayan waters. This southwards expansion could be explained by extending climatic variability events associated with prolonged periods of positive sea surface temperature anomalies in the region. Given the potential commercial relevance of the species, a better understanding of the southward expansion of F. brasiliensis into Uruguayan waters would be helpful in developing efficient management and conservation strategies under a scenario of increasing water temperatures.
  • Effects of methyl farnesoate injection on spermatozoa number and reproductive indices in the narrow-clawed crayfish Pontastacus leptodactylus Original Article

    Bal, Mehmet; Harlıoğlu, Ayşe Gül

    Abstract in English:

    Abstract In this study, the effect of methyl farnesoate (MF) injection on haemolymph MF levels, spermatozoa production and the reproductive indices of gonadosomatic index (GSI), testicular index (TI) and vasosomatic index (VSI) were investigated in males of Pontastacus leptodactylus (Escholtz, 1823). Sixty male P. leptodactylus were used for the study. They were housed in a total of twelve tanks in their normal reproductive season in 2018 and were fed ad libitum with a pelleted food. Animals were injected once a week for five consecutive weeks, at doses of 250 (G2), 500 (G3) and 1000 (G4) ng MF g-1 of body weight. The doses of the injections, the durations used, and the frequency of administration were determined according to the literature. An increase was observed in gonadosomatic index and spermatozoal number of crayfish injected with 1000 ng of MF g-1 of body weight when compared to control (G1, no MF injection applied) and other experimental groups. In addition, the present study indicated that G4 crayfish had a higher GSI, TI and VSI than control crayfish. There was no difference in the level of hemolymph MF between control and MF injected crayfish. In conclusion, MF injection is effective for inducing increased gonadasomatic index and spermatozoal number in P. leptodactylus.
  • Sperm viability in wild-caught males of Macrobrachium tenellum (Smith, 1871) (Decapoda: Caridea: Palaemonidae) fed with different diets Original Article

    Peña-Almaraz, Omar Alejandro; Cortés-Jacinto, Edilmar; Vega-Villasante, Fernando; Arcos-Ortega, G. Fabiola; Badillo-Zapata, Daniel; Vargas-Ceballos, Manuel Alejandro

    Abstract in English:

    Abstract The relationship of body weight and length with sperm load and spermatophore weight was evaluated in wild males of Macrobrachium tenellum (Smith, 1871). In addition, the influence of a commercial and natural feed on the load and viability of sperm was determined in wild males. In 28 wild males spermatophore extraction was performed by electrostimulation 24 h after capture to analyze the relationship between body length/weight and sperm load and viability, respectively. Spermatophore weight (SW), total number (TS), dead (DS) and abnormal sperm cells (AS) were used as indicators of sperm viability. The results obtained show that there is a positive correlation between TS per spermatophore compared to body length and weight of the male. To study the effect of different diets on sperm load, three diets were employed: Diet A, commercial shrimp feed; Diet B, natural feed (mixture of squid, sardine and clam); and Diet C, combination of natural and commercial diet. To assess the initial reproductive status of the males at the beginning of the experiment, sperm viability was determined in a subsample of specimens after capture. Broodstock were fed ad libitum once a day during 70 days. TS, DS, AS and SW were evaluated. The results of the bioassay did not show differences between treatments in the parameters analyzed, except DS, which was higher in the initial group. In conclusion, the present work suggests that it is feasible to substitute fresh feed for an artificial diet for the maintenance in captivity of male M. tenellum broodstock shrimp.
  • A new species of the genus Actinimenes Ďuriš and Horká, 2017 (Crustacea: Decapoda: Palaemonidae) from the Arabian Sea, Lakshadweep Islands, India Original Article

    Paramasivam, Purushothaman; Dhinakaran, A.; Kumar, T. T. Ajith; Lal, Kuldeep K.

    Abstract in English:

    Abstract A new species, Actinimenes koyas sp. nov. (Decapoda: Palaemonidae) was collected at a depth of 1.0-2.0 m from the coral atoll of Agatti Island, Lakshadweep, Arabian Sea. The species was associated with the sea anemone, Heteractis magnifica (Quoy and Gaimard, 1833). It is the second representative of the genus Actinimenes Ďuriš and Horká, 2017 described from the Arabian Sea. Actinimenes koyas sp. nov. is closely related to A. ornatellus in terms of morphological traits. Actinimenes koyas sp. nov. is distinguished from Actinimenes ornatellus (Bruce, 1979) by the presence of a biramous outer antennular flagellum with three proximal segments fused, a shorter free ramus consisting of 7 to 8 segments with 12-14 groups of aesthetascs, a fourth thoracic sternite with V-shaped median incision and features of the telson and third maxilliped. The present new species is easily distinguished from the other three described species in the genus Actinimenes by the structural variation in the fourth sternal plate with a median notch. Additionally, a phylogenetic analysis inferred by Maximum Likelihood using the mitochondrial genes COI and 16S rRNA shows a close relationship of Actinimenes koyas sp. nov. with Actinimenes inornatus (Kemp, 1922). Pairwise genetic distances estimated using the COI and 16S data provided divergences between A. koyas sp. nov. and other congeneric species.
  • Sphaeromopsis jayaraji sp. nov. (Crustacea: Isopoda), a new species of intertidal Sphaeromatidae from the Andaman Islands, northern Indian Ocean Original Article

    Anil, Pathan

    Abstract in English:

    Abstract Sphaeromopsis jayaraji sp. nov. is described from intertidal habitats on the coast of South Andaman, Andaman Islands, the second record of the genus from India. Sphaeromopsis jayaraji sp. nov. is characterized by the following: epistome being widest anteriorly, with a broadly rounded anterior margin and sub-parallel lateral margins, anterior margin with widely spaced plumose setae; pleotelson posterior margin produced to narrowly rounded apex with five setae; uropodal exopod dorsal surface with two deep longitudinal mesial grooves; endopod lateral margin weakly sinuate with long setae, apex with deep mesial groove with plumose setae.
  • A new species of the troglobitic genus Spelaeogammarus da Silva Brum, 1975 (Amphipoda: Artesiidae) from a cave in the Brazilian semi-arid region, with new records of its congener, Spelaeogammarus spinilacertus Koenemann and Holsinger, 2000 Original Article

    Bueno, Alessandra Angélica de Pádua; Bichuette, Maria Elina; Zepon, Tamires; Penoni, Ludmila Rocha

    Abstract in English:

    Abstract We propose a new species of the troglobitic genus Spelaeogammarus da Silva Brum, 1975, with data on its distribution, ecology, aspects of behavior, and conservation status. Spelaeogammarus ginae sp. nov. occurs in a single cave in the Serra do Ramalho karst area, of the northeastern Brazilian semi-arid region. We also provide new data on the distribution and conservation status of its congener, Spelaeogammarus spinilacertus Koenemann and Holsinger, 2000 that occurs in the upper phreatic aquifer inside caves from Chapada Diamantina domain. Both species occur in caves in the state of Bahia, northeastern Brazil.
  • Rediscovery and redescription of Entoniscus creplinii Giard and Bonnier, 1887 (Isopoda: Bopyroidea: Entoniscidae) parasitizing Polyonyx gibbesi Haig, 1956 (Decapoda: Anomura: Porcellanidae), a symbiotic crab from the tubes of Chaetopterus cf. variopedatus (Annelida), from North Carolina and Florida, U. S. A. Original Article

    McDermott, John J.; Williams, Jason D.; Boyko, Christopher B.

    Abstract in English:

    Abstract The porcellanid crab Polyonyx gibbesi Haig, 1956, an obligate symbiont of Chaetopterus cf. variopedatus (Renier, 1804) in the western Atlantic, is parasitized by a rare entoniscid isopod. Crabs from coastal North Carolina and Florida, U.S.A., were dissected and examined for this internal parasite in 1966 and 1967. Two of 83 crabs (2.4 %) and 3 of 100 (3.0 %) crabs from North Carolina and Florida, respectively, were parasitized. Only female parasites were found, including five immature and three mature specimens; one host was parasitized by three immature entonicisds simultaneously. One of the mature parasites was liberating epicaridium larvae and the others had developing eggs or larvae. Parasitized female crabs were all ovigerous; the parasites did not castrate the hosts. The parasite is identified as Entoniscus creplinii Giard and Bonnier, 1887, previously known only from Brazil, and the female is redescribed.
  • Biology, trophic chain, and ethnobiological calendar of the mangrove crab, Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae), according to the perception of catchers in Itanhaém, São Paulo, Brazil Original Article

    Souza, Fernanda Vargas Barbi de; Pinheiro, Marcelo Antonio Amaro

    Abstract in English:

    Abstract Ethnobiology helps to better understand research processes involving humans and nature. It produces important information for the management of ecosystems and their natural resources. The mangrove crab (Ucides cordatus) is an endemic mangrove crustacean that lives in close association with arboreal vegetation and whose distribution extends throughout this ecosystem along the Brazilian coast. It plays an important role in ecosystem processes, actively participating in sediment bioturbation and the flow of organic matter and energy, affecting the entire trophic chain of coastal environments. This study compiles ethnobiological data from catchers in the Itanhaém River Estuary (SP) on the biology of the mangrove crab according to morphotype (male and female), biological cycle (growth and reproductive period), fishing season, and its participation in the trophic chain of mangroves. Thus, this study serves as a basis for education and environmental management actions. The authors conducted interviews using the snowball technique and applied a semi-structured questionnaire with open and closed questions for catchers. We submitted the data to qualitative and quantitative analysis and compared it with data from the available literature. We interviewed the entire sample universe of catchers in the study area. Ethnobiological data referring to the periods of growth and reproduction coincided with literature data in the following proportions: 66.8 % for Brazil and 82.5 % for the southeast-south region. The results reinforce the relevance and accuracy of local ecological knowledge in the interpretation of data from nature. Moreover, the results show gaps in compliance with the norms for the protection of this species.
  • A new species of Spelunconiscus (Isopoda: Oniscidea: Styloniscidae) for Brazilian caves: new record for the type species and an emended diagnosis for the genus Original Article

    Bastos-Pereira, Rafaela; Souza, Leila A.; Sandi, Beatriz de S.; Ferreira, Rodrigo L.

    Abstract in English:

    Abstract Spelunconiscus Campos-Filho, Araujo and Taiti, 2014 is a monotypic genus of the family Styloniscidae represented by a troglobitic species, Spelunconiscus castroi Campos-Filho, Araujo and Taiti, 2014, from the cave MOC-32, in the state of Minas Gerais, southeastern Brazil. New representatives of this family were found in three additional caves, which revealed a new species, Spelunconiscus septemlacuum sp. nov., from Taboa and Tatuzinhos caves and a new occurrence for the type-species in Retiro cave. The original diagnosis of Spelunconiscus is emended due to the discovery of a spur-like structure in the male pereopod VII ischium, as well as some supplementary traits that have not been previously considered. Spelunconiscus septemlacuum sp. nov. differs from S. castroi in the number of articles of the antennal flagellum, in the proportion between this flagellum and 5th article of peduncle of antenna, in the size of maxilliped endite, in the morphology of male pleopod II and in body size. A discussion is provided for both taxonomic and ecological concerns.
  • Simultaneous double parasitism by the parasitic cymothoids (Crustacea: Isopoda) of two genera on a single host fish Tenualosa toli from India Original Article

    Aneesh, Panakkool Thamban; Kottarathil, Helna Ameri; Kumar, Appukuttannair Biju

    Abstract in English:

    Abstract Members of the fish parasitic isopod family Cymothoidae usually parasitize a host fish by a single species infestation. For the first time from Indian waters two species of cymothoids, the body surface infesting Anilocra grandmaae Aneesh, Hadfield, Smit and Kumar, 2021 and the branchial infesting Agarna malayi Tiwari, 1952, were reported simultaneously parasitizing the same individual toli shad, Tenualosa toli (Valenciennes, 1847). Each double-infested T. toli harboured an ovigerous female of A. grandmaae and an ovigerous female and male of A. malayi. Out of 814 host fishes collected from seven different localities, along the Kerala coast, southwest coast and Bay of Bengal coast, 113 fishes were infested with only A. malayi and 71 individuals were infested with only A. grandmaae. Interestingly, nine individuals of T. toli harboured both A. malayi and A. grandmaae simultaneously. Cymothoid co-occurrence is rarely reported, and this is the first report of two cymothoid species infesting a single fish host from India. Globally, it is the third record of simultaneous occurrence of two cymothoids and the first record of body surface and branchial cymothoids parasitising the same individual fish.
  • A new hermit crab of the genus Calcinus from Rapa Island, French Polynesia with affinities to Calcinus dapsiles Morgan, 1989 and Calcinus sirius Morgan, 1991 (Decapoda: Anomura: Diogenidae) Original Article

    Poupin, Joseph; Lemaitre, Rafael

    Abstract in English:

    Abstract A new hermit crab of the genus Calcinus Dana, 1851 is described from a specimen collected at a depth of 100 m near Rapa Island, Austral Islands, French Polynesia. In a previous report, we had reported this specimen provisionally as Calcinus aff. sirius, pending availability of live color data for Calcinus sirius Morgan, 1991. Recently obtained color photographs of live C. sirius from the Solitary Islands, Eastern Australia, has shown that the specimen from Rapa Island is distinct from Morgan’s taxon and represents a new species which is fully illustrated and described herein as Calcinus shawi sp. nov. The morphology and coloration of this new species are compared with the closely allied C. sirius and Calcinus dapsiles Morgan, 1989.
  • Estimation of key population parameters of Penaeus indicus H. Milne Edwards, 1837 (Crustacea: Penaeidae) in the Andharmanik River, southern Bangladesh: implications for sustainable management Original Article

    Ahamed, Ferdous; Ahmed, Zoarder Faruque; Ohtomi, Jun

    Abstract in English:

    Abstract This study was conducted to estimate the key population parameters to understand both the current status and the yield of Penaeus indicus H. Milne Edwards, 1837 in the Andharmanik River, southern Bangladesh, using monthly samples collected from July 2019 to June 2020. We found that the size at first sexual maturity of P. indicus is 15.5 mm CL. The spawning season was August - December with a peak in September. Recruitment occurred at ~8.4 mm CL for an extended period of the year with two pulses: one in November (minor recruitment pulse) and another in February (major recruitment pulse). The von Bertalanffy growth equation gave the following results: CL∞ = 31.9 mm and K = 1.14 year-1. The overall growth performance index was 3.37 and the longevity was 2.6 years. The estimated total, natural, and fishing mortalities were 3.53, 2.15, and 1.38 year-1, respectively. Therefore, the exploitation rate was 0.39 and the maximum sustainable yield was 0.42, indicating that the stock is almost optimally exploited. Hence our work should help improve decisions to (i) conserve the stock, (ii) maximize economic returns from the stock, and (iii) continue ensuring that the stock is exploited in an ecologically sustainable way.
  • Effect of temperature on survival, intermolt period, and growth of juveniles of two mud crab species, Scylla paramamosain and Scylla serrata (Decapoda: Brachyura: Portunidae), under laboratory conditions Original Article

    Sanda, Tetsuya; Shimizu, Tomohito; Iwasaki, Takashi; Dan, Shigeki; Hamasaki, Katsuyuki

    Abstract in English:

    Abstract Temperature affects ectotherm's biological processes and plays a fundamental role in determining their geographical distribution. We elucidated the temperature adaptation of juveniles of two mud crab species in the genus Scylla De Haan, 1833 (in De Haan, 1833-1850): Scylla paramamosain Estampador, 1949 and Scylla serrata (Forskål, 1775), which occur mainly in temperate and subtropical/tropical areas in Japan, respectively. The first instar crabs (C1) were raised from three broods for each species and were individually cultured to molt to C2-C5 at different temperatures (15.2-30.5 °C℃). In S. paramamosain, C1 juveniles could molt to C2 at 15.4 °C and the survival rate was reduced at 29.8 °C through C4-C5. In S. serrata, C1 juveniles could not molt to C2 at 15.2 °C and the survival rate was not affected by temperature thereafter. The intermolt period was shortened at higher temperatures in both species. The carapace width of juveniles increased with increasing temperature but became smaller at 27.6-30.2 °C in S. paramamosain, whereas it appeared to reach a plateau at > 24 °C in S. serrata. The lower threshold temperature (95 % confidence interval) for the development of C1 juveniles was estimated as 13.65 °C (13.51-13.77 °C) for S. paramamosain, and 15.44 °C (15.12-15.72 °C) for S. serrata. Thus, juveniles of S. paramamosain and S. serrata adapted to lower and higher temperature conditions, respectively, reflecting their biogeographical distribution.
  • A new species of Tortanus (Atortus) Ohtsuka, 1992 (Copepoda, Calanoida, Tortanidae) from Great Nicobar Island, north-eastern Indian Ocean Original Article

    Francis, Sanu V.; Jasmine, P.; Nandan, S. Bijoy

    Abstract in English:

    Abstract A new planktonic copepod assigned to the subgenus Tortanus (Atortus) Ohtsuka, 1992 is described from Great Nicobar Island, Andaman and Nicobar archipelago. The new species Tortanus (Atortus) dhritiae sp. nov. belongs to the tropicus-group. The new species can be distinguished from all other species of the tropicus-group by the presence of a notch on the left lateral joining of fourth and fifth pedigerous somites, asymmetrical caudal rami with a rounded process originating from the anterior portion of the left ramus produced over to the right, and an elliptical shaped exopodal lobe of leg 5 with distolateral curved seta in female. In male, serrated ridge on the anterior one-third surface of segment XX of the right antennule, obtuse trapezoid-shaped right leg 5 coxa with triangle-shaped medial process, semi-circular basis with slight curve near base and crocodilian head-shaped medial process with small process distally and bearing one distal and one medial setae.
  • Faunistic and ecological assessment of interstitial Harpacticoida (Crustacea, Copepoda) on a sandy beach in Balıkesir (Turkey) Original Article

    Alper, Alp

    Abstract in English:

    Abstract Interstitial harpacticoids along the mediolittoral zones of Sarımsaklı Beach, Turkey, were sampled monthly between April 2016 and March 2017 in order to reveal the effects of pH, water temperature, salinity, electrical conductivity, dissolved oxygen, and grain size on the occurrence and composition of the harpacticoids. Examination of the samples from nine stations revealed a total of 66 species. In terms of harpacticoid species abundance, Ectinosoma soyeri Apostolov, 1975 was ranked first followed by Sarsamphiascus angustipes (Gurney, 1927) and Leptomesochra eulitoralis Noodt, 1952. The variations in harpacticoid community were estimated by using some ecological indices (Species richness, Shannon’s diversity and Pielou’s evenness). Principal component analysis (PCA) based on the abiotic factors was applied for ordination of the stations. Relationships between environmental and temporal parameters as well as harpacticoid community structure were analyzed using distance-based Linear Models (DistLM). Relationships between environmental variables and most abundant species were determined with the Redundancy analysis (RDA). The abundance of S. angustipes and Klieonychocamptus ponticus (Serban and Plesa, 1957) were positively correlated with all tested variables except water temperature. The abundance of Klieonychocamptus kliei (Monard, 1935) was positively correlated with water temperature, grain size and salinity, while it was negatively correlated with dissolved oxygen and pH. The abundance of Ameira sp. and Microsetella norvegica (Boeck, 1865) were negatively correlated with all tested variables except water temperature. The abundance of E. soyeri and Ameira parvula (Claus, 1866) were negatively correlated with all tested variables except pH. The abundance of Leptomesochra eulitoralis was positively correlated with water temperature and salinity, while it was negatively correlated with grain size, dissolved oxygen and pH.
  • First report of Hyssuridae (Isopoda: Anthuroidea) from Japan, with the description of a new Kupellonura species Original Article

    Shiraki, Shoki; Shimomura, Michitaka; Kakui, Keiichi

    Abstract in English:

    Abstract We describe Kupellonura tamago sp. nov., collected from the North Pacific off the southern coast of the Boso Peninsula, Japan, at a depth of 445-407 m. This is the first record of Hyssuridae not only for Japan but also for the Temperate Northern Pacific ecoregion. Female K. tamago closely resembles Kupellonura gidgee Poore and Lew Ton, 1988 and Kupellonura indonesica Annisaqois and Wägele, 2021 in the shape of the uropodal exopod but differs from them in having a broader uropodal exopod (length/width ratio 1.47), a broader uropodal endopod (length/width ratio 1.64), and the telson margins smooth. We transfer Kupellonura flexibilis (Pasternak, 1982), originally described in Ananthura Barnard, 1925 but provisionally transferred to Kupellonura Barnard, 1925, to Anthelura Norman and Stebbing, 1886 in Antheluridae, as Anthelura flexibilis (Pasternak, 1982) comb. nov.
  • Carapace width/length-weight relationships for portunid crabs (genus Callinectes Stimpson, 1860) in northern Brazilian mangrove estuaries Short Communication

    Oliveira, Rory Romero de Sena; Oliveira, Danielly Brito de; Cordeiro, Ana Patrícia Barros; Cintra, Israel Hidenburgo Aniceto; Klautau, Alex Garcia Cavalleiro de Macedo

    Abstract in English:

    Abstract Carapace width-carapace length (CW/CLRs), carapace width-weight (CW/WRs), and carapace length-weight (CL/WR) relationships are presented for the portunid species Callinectes bocourti A. Milne Edwards, 1879, Callinectes danae Smith, 1869, and Callinectes ornatus Ordway, 1863 from the northern coast of Brazil. A total of 85 crabs were collected between May and October 2015 in intertidal zones of the Caeté, Pirabas and Salinas estuaries. All species had strong relationships between measurements with a coefficient of determination (r 2) ranging between 0.97 and 0.99. The variable most strongly related to CW was CL with 99 % of the variability provided by C. ornatus. These relationships are a useful tool for field ecologists to estimate length and/or mass of portunid species, and it is not necessary to euthanize the organism to collect body measurements. Additionally, this study describes the first reference of CW/CLRs and CL/WRs for these portunid species in the region. The Callinectes species in Amazon estuaries are still poorly studied, and there is a need for monitoring their stocks due to its importance for artisanal fishery. The present data are important for supplying biological information required for an adequate management of this fishery.
  • Observation of a coral-dwelling gall crab (Cryptochiridae) in a dead coral host highlights their vulnerability to reef degradation Short Communication

    Meij, Sancia E.T. van der

    Abstract in English:

    Abstract Coral-associated fauna contributes greatly to coral reef biodiversity. Many species are obligately associated with their hosts on which they depend for food and/or refuge from predators. Their close relationship with their hosts makes them vulnerable to coral mortality. Here I report a coral-dwelling gall crab (Cryptochiridae) inhabiting a partially dead Echinopora Lamarck, 1816 coral, at Magoodhoo Island, Faafu Atoll, Maldives. Cryptochirids are thought to feed off the mucus provided by their coral host, although some questions about their feeding biology remain. This observation highlights that these crabs remain associated with a dead host, even if it can no longer provide nutrients. The strong host association makes gall crabs vulnerable to widespread habitat degradation.
Sociedade Brasileira de Carcinologia Instituto de Biociências, UNESP, Campus Botucatu, Rua Professor Doutor Antônio Celso Wagner Zanin, 250 , Botucatu, SP, 18618-689 - Botucatu - SP - Brazil
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