Abstract
A series of specimens of the fish external parasite Rocinella murilloi Brusca and Iverson, 1985, is reported from 12 localities off western Mexico. These records are the first for southwestern Mexico (four) and add six new localities off the west coast of the Baja California Peninsula where the species was known from a single record. The specimens were recovered from bottom-operated nets, between 700 and 1235 m, slightly shallower than previous records. Environmental conditions confirm the presence of R. murilloi below the core of the Oxygen Minimum Zone, and this species appears to be highly tolerant to moderate to severe hypoxic conditions. General distribution of the species in the eastern Pacific is presented.
Keywords
Isopods; deep sea; eastern Pacific; environmental parameters
Introduction
Species of the genus RocinelaLeach, 1818Leach, W.E. 1818. Cymothoadées. p. 338-358. In: (editor unknown), Dictionnaire des Sciences Naturelles, vol. 12. Paris, Strasbourgs et Levrault., in the eastern tropical Pacific were reviewed by Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.). The deep-water isopod Rocinela murilloi Brusca and Iverson, 1985, was originally described from material collected by the “Velero IV” off Punta Guiones on the coast of Costa Rica at 1,866 m depth. Later records by Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.) indicated that this is a widely distributed species, occurring in Californian waters, particularly from the San Diego area, off the Baja California west coast (one locality at Punta Descanso), Mexico, off Peru (near Lobos de Tierra and Lobos de Afuera Islands), and off Arica, Chile. Until 2008 the only locality reported for the Gulf of California was at 21°19'N 106°24'W, at 1201 m depth, but a series of specimens was reported in six new localities in the southern Gulf (Hendrickx, 2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.). Despite its wide distribution, R. murilloi has been scarcely reported from the eastern Pacific except from off California (Brusca and France, 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.), and there are large latitudinal intervals with single or no records, e.g., the SW coast of Mexico, south of the Gulf of California, off Central America except Costa Rica, and off Pacific Colombia and Ecuador.
During exploratory cruises off the west coast of the Baja California Peninsula and off SW Mexico, more material of R. murilloi was collected in 12 localities, thus extending our knowledge on the distribution and occurrence of this large species of Aegidae off western Mexico. Additional information on its ecology was also obtained. Two additional records from the Gulf of California are also included in this report.
Material and Methods
The specimens on which this study is based were collected during the TALUD VIII (April 2005), X (February 2007; Gulf of California), XII (April 2008; SW Mexico), XV (July -August 2012), and XVI-B (May 2014) (both off Baja California west coast) cruises aboard the R/V "El Puma" of the Universidad Nacional Autónoma de México (UNAM). Material was collected in depths of 700-1235 m with a benthic sledge operating in a global depth interval of 300-2300 m. Environmental data near the bottom (epibenthic) were obtained with a Seabird CTD (water temperature) and by direct titration of oxygen concentration in water samples collected with General Oceanic Niskin bottles. Sediments were collected with a multicore meiofauna sampler. Organic matter was determined by the ignition method. Depth was measured with ship echosounders (see Papiol et al., 2016Papiol, V.; Hendrickx, M.E. and Serrano, D. 2016. Effects of latitudinal changes in the oxygen minimum zone of the northeast Pacific on the distribution of bathyal benthic decapod crustaceans. Deep Sea Research Part II: Topical Studies in Oceanography, 137: 113-130. for further details). The material has been deposited in the Regional Invertebrate Collection (ICML-EMU), UNAM, in Mazatlán, Mexico. Abbreviations: St., station; spec., specimen(s); TL, total length (± 0.1 mm). SEM (Scanner Electron Microscope) photographs of appendages were obtained during this study.
Systematics
Family Aegidae White, 1850
Genus Rocinela Leach, 1818Leach, W.E. 1818. Cymothoadées. p. 338-358. In: (editor unknown), Dictionnaire des Sciences Naturelles, vol. 12. Paris, Strasbourgs et Levrault.
Rocinella murilloi Brusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.
Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77., female, 33.6 mm (ICML-EMU-9973), dorsal view.
Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77., female, 33.4 mm (ICML-EMU-9973), SEM photographs of pereopods. A, pereopod I; B, same, detail of propodus; C, same, detail of carpus and distal part of merus; D, pereopod II; E, same, detail of propodus; F, same, detail of carpus and merus; G, pereopod III; H, same, detail of propodus; I, same, detail of carpus and merus.
Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77., female, 33.6 mm (ICML-EMU-9973), mandible. A, mandibular palp; B, same, detail of distal two articles; C, mandible, general view; D, detail of molar process; E, detail of incisor; F, detail of lacina mobilis (see text for explanations).
Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.. A, female, 33.4 mm; B, C, female, 33.6 mm (ICML-EMU-9973). A, ventral view of the frontal part; B, scales on second article of pereopod III; C, same, magnified.
Rocinella murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.: 44, fig. 14 a-j.- Brusca and France, 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.: 258, figs. 1A-B, 2, 4A, 5H, 15-17. - Espinosa-Pérez and Hendrickx, 2001Espinosa Pérez, Ma. C. and Hendrickx, M.E. 2001. Checklist of isopods (Crustacea: Peracarida: Isopoda) from the eastern tropical Pacific. Belgian Journal of Zoology, 131: 41-54., 47 (list). - Hendrickx, 2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.: 1260.
Material examined. TALUD VIII, St. 20 (25º56'56"N 110º43'W), Apr 19, 2005, 1 spec. (TL 14.1 mm), BS, 700-750 m (ICML-EMU-9971).
TALUD X, St. 9 (27º52'51"N 112º15'53"W), Feb 10, 2007, 1 spec. (TL 18.5 mm), BS, 1205-1215 m (ICML-EMU-9969).
TALUD XII. St. 13 (17°45'16"N 102°0'29" W), Mar 30, 2008, 1 spec. (TL 34.5 mm), BS, 1198 m (ICML-EMU-10630-A); St. 23 (18º33'43"N 103º57'45"W), Abr 1, 2008, 50 spec. (TL 25.4-34.4 mm), BS, 1058-1088 m (ICML-EMU-9973); St. 27 (18º40'28"N 104º35'51"W), Abr 2, 2008, 4 spec. (TL 16.2-34.8 mm), BS, 1040-1095 m (ICML-EMU-9972); St. 28 (18º50'19"N 104º34'14"W), Apr 2, 2008, 1 spec. (TL 33.7 mm), BS, 1101-1106 m (ICML-EMU-9970).
TALUD XV. St. 1 (23°18' 40"N 111°19' 37"W), Aug 4, 2012, 4 spec. (TL 11.9-14.1 mm), BS, 750-850 m (ICML-EMU-10630-B); St. 5C (23º16'42"N 110º54'55"W), Aug 5, 2012, 4 spec. (TL 25.8-34.7 mm), BS, 980-1036 m (ICML-EMU-10632-A); St. 5E (23º05'22"N 110º27'54"W), Aug 5, 2012, 1 spec. (TL 34.8 mm), BS, 948-954 m (ICML-EMU-10630-C); St. 8 (24º54'48"N 112º38'06"W), Jul 30, 2012, 1 spec. (TL 33.3 mm), BS, 1212-1235 m (ICML-EMU-10631-B); St. 24 (27°5'42"N 114°35'30"W), Aug 1, 2012, 1 spec. (TL 32.1 mm), BS, 772-786 m (ICML-EMU-10631-A).
TALUD XVI-B, St. 5 (28º48'6"N 115º24'6"W), May 24, 2014, 1 spec. (TL 31.6 mm), BS, 772-776 m (ICML-EMU-10632-B).
Taxonomic remarks. The material examined fits well with the original description of the body of Rocinela murilloi by Brusca and Iverson (1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.) and Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.): cephalon about twice as wide as long; eyes large, dark, widely separated; antenna 1 short, antenna 2 extending to pereonite III; pereonite I the longest; coxae of pereonites V-VII extending posteriorly; pleotelson with a pair of submedian pits (Fig. 1). The original description (Brusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.) also included illustrations of the pereopods I, IV and VII, the maxilliped, the pleopods 1-5, and a dorsal view of the female holotype. Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.) completed the illustration series by adding drawings of the frontal margin of the carapace (ventral view), the mandible, the maxillule, the maxilla, the pereopod III, and the uropod (all from the holotype). SEM photographs of selected appendages and of the frontal portion of the carapace of R. murilloi (Figs. 2-4) are provided here for the first time. The shape and ornamentation of pereopods I-III of the material examined (Fig. 2A, D, G) perfectly match the illustrations and descriptions provided by Brusca and Iverson (1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.) and Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.), with the inferior margin of the propodus featuring a distally expanded, broadly-rounded lobe, with 5-5-5 (pereopods I-II-III) stout, recurved spines (Fig. 2B, E, H). In the pereopod I, the carpus has one stout spine (Fig. 2C), and the merus features 2 distal spines (Fig. 2C) and 1 subbasal, shorter spine. Pereopod II (not described previously) (Fig. 2D-F) is similar to pereopod I but with two stout spines on the carpus (Fig. 2F). The merus of pereopod III (Fig. 2G, I) has 3 long, distal stout spines, decreasing in length towards the proximal margin, and one shorter, proximal spine.
The mandible of the examined material (Fig. 3A-F) also closely matches the description and illustrations provided by Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.), with a 3-articulated palp (Fig. 3A, B), the second article about twice as long as first, and with a distal row of about 10 serrate spines and 2 distal, single setae (Fig. 3B); the strongly projecting linguiform molar process (Fig. 3C) also matches the description, and is covered by regularly spaced rows of minute spines (Fig. 3D); the claw-like incisor is spoon-like, ending in a rather sharp tip (Fig. 3E), and the lobe between the molar process and the incisor (the lamina mobilis of Brusca and France, 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.) seems to be an isolated process surrounded by a field of numerous, sharp spinules (Fig. 3F).
Brusca and France (1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.) also provided an illustration and a SEM photograph of the ventral view of the frontal part of R. murilloi carapace, with a narrow, arrowhead shape frontal lamina that perfectly matches the material examined (Fig. 4A).
The surface of the pereopods I-III articles is covered by minute scales (Fig. 4B, C), not illustrated previously.
Discussion
Rocinela murilloi is a widely distributed deep-water aegid, ranging from California to Chile (Brusca and France, 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.; Hendrickx, 2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.). It was reported for this geographical range by Espinosa-Pérez and Hendrickx (2001Espinosa Pérez, Ma. C. and Hendrickx, M.E. 2001. Checklist of isopods (Crustacea: Peracarida: Isopoda) from the eastern tropical Pacific. Belgian Journal of Zoology, 131: 41-54.) but inadvertently omitted by the same authors for polar and temperate waters of the East Pacific (Espinosa-Pérez and Hendrickx, 2006Espinosa-Pérez, M.C. and Hendrickx, M.E. 2006. A comparative analysis of biodiversity and distribution of shallow water marine isopods (Crustacea: Isopoda) from polar and temperate waters in the East Pacific. Belgian Journal of Zoology, 136: 219-247.).
Hendrickx (2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.) reported a total of 11 specimens from seven localities in the southern Gulf of California. The material examined in the present study amounts to two additional specimens from the southern Gulf of California (2 localities), 56 specimens from SW Mexico (4 localities), and 12 specimens from off the west coast of the Baja California Peninsula (6 localities) (Fig. 5). With a total of 81 specimens found in 19 localities, R. murilloi appears to be a widespread and relatively common species of fish parasite in deep-water off western Mexico. When considering new and previous records for this species (Tab. 1), there is a clear lack of data for very wide areas in the eastern Pacific (Fig. 5), particularly between SW Mexico (17°45'16"N) and Costa Rica (ca. 09°36.7'N), between Costa Rica and northern Peru (7°07'S), and between northern Peru and Chile (only two records in ca. 18°40'S and 33°39'S).
Sampling localities in the eastern Pacific where Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77. has been collected.
Previous and present records of Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77. in the eastern Pacific. N, number of specimens; LACM-AHF, Los Angeles County Museum of Natural History, ex-Allan Hancock Foundation, California; AMS, The Australian Museum, Sydney; SIO, Scripps Institution of Oceanography, California; USNM, United States National Museum, Washington D.C. Some closely set records overlap.
The material reported by Hendrickx (2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.) for the southern Gulf of California was collected at depths of 890 to 1274 m, with an epibenthic dissolved oxygen range of 0.20 to 0.76 ml/l, and a bottom temperature range of 3.6 to 5.3 ºC. Overall depth range of the additional material examined herein is 700 to 1235 m, thus slightly shallower than previously known (768 to 1866 m; Brusca and France 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.). The new material reported herein was collected in a lower dissolved oxygen concentrations range (i.e., 0.11-0.65 ml/l) and a slightly different temperature range (i.e., 3.44-5.75 ºC). Salinity data at sampling localities, not available in Hendrickx (2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.) report, were 34.42-34.60 ups. Additional information shows a strong variation in sediments composition and in % of organic carbon content (Tab. 2). This differs from the muddy environment previously reported by Hendrickx (2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.). Sediment type at sampling localities, however, might not be directly related to the presence of the isopods, which are temporary external parasites of fishes.
Environmental data associated with the capture of Rocinela murilloiBrusca and Iverson, 1985Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77. (present study).
Present information and previous records (Hendrickx, 2008Hendrickx, M.E. 2008. Rediscovery of Rocinela murilloi Brusca and Iverson, 1985 (Crustacea: Isopoda: Aegidae) in the Gulf of California, Mexico, and ecological data associated with its capture. Crustaceana, 81: 1259-1262.) indicate that R. murilloi is highly tolerant to oxygen depletion and is a member of the deep-water fauna inhabiting below the lower boundary of the Oxygen Minimum Zone (OMZ) occurring off western Mexico (see Hendrickx and Serrano, 2010Hendrickx, M.E. and Serrano, D. 2010. Impacto de la zona de mínimo de oxígeno sobre los corredores pesqueros en el Pacífico mexicano. Interciencia, 35: 12-18.). This OMZ is particularly wide, deep, and with anoxic core-values off the west coast of Baja California (Papiol et al., 2016Papiol, V.; Hendrickx, M.E. and Serrano, D. 2016. Effects of latitudinal changes in the oxygen minimum zone of the northeast Pacific on the distribution of bathyal benthic decapod crustaceans. Deep Sea Research Part II: Topical Studies in Oceanography, 137: 113-130.) and off SW Mexico (Serrano, 2012Serrano, D. 2012. La zona de mínimo oxígeno en el Pacífico mexicano. p. 105-119. In: P. Zamorano, M.E. Hendrickx and M. Caso (eds), Biodiversidad y comunidades del talud continental del Pacífico mexicano. México D.F., Mexico, Secretaría del Medio Ambiente y Recursos Naturales (SEMARNAT), Instituto Nacional de Ecología (INE).). Although R. murilloi is presumably attached in a permanent way to their hosts and might therefore move over long distance over the sea floor, environmental conditions prevailing close to the bottom below the OMZ core, in a similar depth range, are considered stable, particularly in what concerns dissolved oxygen concentration and water temperature (Hendrickx and Serrano, 2010Hendrickx, M.E. and Serrano, D. 2010. Impacto de la zona de mínimo de oxígeno sobre los corredores pesqueros en el Pacífico mexicano. Interciencia, 35: 12-18.; Serrano, 2012Serrano, D. 2012. La zona de mínimo oxígeno en el Pacífico mexicano. p. 105-119. In: P. Zamorano, M.E. Hendrickx and M. Caso (eds), Biodiversidad y comunidades del talud continental del Pacífico mexicano. México D.F., Mexico, Secretaría del Medio Ambiente y Recursos Naturales (SEMARNAT), Instituto Nacional de Ecología (INE).).
Species of Rocinela are blood-sucking temporary parasites of marine fishes. They can easily detach from their host, swim and reattach to a new host. However, very little is known about the fish-parasite relationship (Brusca and France, 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.). Rocinela murilloi and other species of the genus may abandoned their host once they are captured in bottom trawls or slegdes (see Brusca and France, 1992Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.; Wing and Moles, 1995Wing, B. L. and Moles, D. A. 1995. Behavior of Rocinela angustata (Isopoda, Aegidae), an ectoparasite of Alaskan marine fishes. Journal of Aquatic Animal Health, 7: 34‒37.), thus making the identification of hosts very difficult. Cruz-Acevedo et al. (2018Cruz-Acevedo, E.; Tolimieri, N. and Aguirre-Villaseñor, H. 2018. Deep-sea fish assemblages (300-2100 m) in the eastern Pacific off northern Mexico. Marine Ecology Progress Series, 592: 225-242.) reported 50 species of bathypelagic and bathydemersal deep-water fishes between 300 and 2100 m off western Baja California, the area where most specimens of R. murilloi were collected in the present survey. Of these, 27 species were captured in depths that match the depths at which the isopods were caught, thus leaving unclear possible associations. However, based on the list of species of fishes captured in the same samples (Cruz-Acevedo et al., 2018Cruz-Acevedo, E.; Tolimieri, N. and Aguirre-Villaseñor, H. 2018. Deep-sea fish assemblages (300-2100 m) in the eastern Pacific off northern Mexico. Marine Ecology Progress Series, 592: 225-242.), R. murilloi could be a parasite of BathypteroisGünther, 1878Günther, A. 1878. Preliminary notices of deep-sea fishes collected during the voyage of H.M.S. “Challenger” by Albert Günterm F.R.S, keeper of the Zoological Department, British Museum. Annals and Magazine of Natural History (Series 5), 2 (7/8/9) (art. 2/22/28): 17‒23, 179‒187, 248‒251. (two species), Dicrolene filamentosaGarman, 1899Garman, S. 1899. Reports on an exploration off the west coasts of Mexico, Central and South America, and off the Galapagos Islands, in charge of Alexander Agassiz, by the U.S. Fish Commission Steamer Albatross, during 1891, Lieut. Commander Z.L. Tanner, U.S.N., commanding. The fishes. Memoirs of the Museum of Comparative Zoology at Harvard College, 26: 1‒431., Dibranchus spinosus (Garman, 1899Garman, S. 1899. Reports on an exploration off the west coasts of Mexico, Central and South America, and off the Galapagos Islands, in charge of Alexander Agassiz, by the U.S. Fish Commission Steamer Albatross, during 1891, Lieut. Commander Z.L. Tanner, U.S.N., commanding. The fishes. Memoirs of the Museum of Comparative Zoology at Harvard College, 26: 1‒431.), ParaliparisCollett, 1879Collett, R. 1879. Fiske fra Nordhavs-Expeditionens sidste Togt, Sommeren 1878. Forhandlinger i Videnskabs-selskabet i Christiania, 14: 1-106., SebastolobusGill, 1881Gill, T. N. 1881. A deep-sea rock-fish. Annual Report of the Board of Regents of the Smithsonian Institution, 14: 375., or LycenchelysGill, 1884 Gill, T. N. 1884. On the anacanthine fishes. Proceedings of the Academy of Natural Sciences of Philadelphia, 36: 167‒183. (three species).
Ackowledgements
Ship time aboard the R/V "El Puma" was provided by the Coordinación de la Investigación Científica, UNAM, and partly supported by CONACyT (project 179467 for the TALUD XV and XVI-B cruises). The TALUD project has also received laboratory and field work support from CONACyT (project 179467 for the TALUD XV and XVI-B cruises), Mexico. Thanks to Philippe Willenz, Institut Royal des Sciences Naturelles de Belgique (IRSNB) for his invitation and to Julien Cillis (IRSNB) for his contribution with SEM photographs of figures 2-4. The final edition of the manuscript and of the figures was done by Mercedes Cordero. Photograph of figure 1 was taken and edited by José Salgado-Barragán. Special thanks to J. Goy for reviewing the redaction of the last draft of the manuscript. The author thanks all participants in the TALUD cruises for their help during the sampling operations aboard the R/V "El Puma".
References
- Brusca, R.C. and France, F.C. 1992. The genus Rocinela (Crustacea: Isopoda: Aegidae) in the tropical eastern Pacific. Zoological Journal of the Linnean Society, London, 106: 231-275.
- Brusca, R.C. and Iverson, E.W. 1985. A guide to the marine isopod Crustacea of Pacific Costa Rica. Revista de Biología Tropical, 33: 1-77.
- Collett, R. 1879. Fiske fra Nordhavs-Expeditionens sidste Togt, Sommeren 1878. Forhandlinger i Videnskabs-selskabet i Christiania, 14: 1-106.
- Cruz-Acevedo, E.; Tolimieri, N. and Aguirre-Villaseñor, H. 2018. Deep-sea fish assemblages (300-2100 m) in the eastern Pacific off northern Mexico. Marine Ecology Progress Series, 592: 225-242.
- Espinosa Pérez, Ma. C. and Hendrickx, M.E. 2001. Checklist of isopods (Crustacea: Peracarida: Isopoda) from the eastern tropical Pacific. Belgian Journal of Zoology, 131: 41-54.
- Espinosa-Pérez, M.C. and Hendrickx, M.E. 2006. A comparative analysis of biodiversity and distribution of shallow water marine isopods (Crustacea: Isopoda) from polar and temperate waters in the East Pacific. Belgian Journal of Zoology, 136: 219-247.
- Garman, S. 1899. Reports on an exploration off the west coasts of Mexico, Central and South America, and off the Galapagos Islands, in charge of Alexander Agassiz, by the U.S. Fish Commission Steamer Albatross, during 1891, Lieut. Commander Z.L. Tanner, U.S.N., commanding. The fishes. Memoirs of the Museum of Comparative Zoology at Harvard College, 26: 1‒431.
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Publication Dates
-
Publication in this collection
06 Dec 2018 -
Date of issue
2018
History
-
Received
04 July 2018 -
Accepted
30 Oct 2018