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Neotropical Ichthyology

Print version ISSN 1679-6225

Neotrop. ichthyol. vol.13 no.1 Maringá Jan./Mar. 2015

http://dx.doi.org/10.1590/1982-0224-20140034 

Articles

A new deep-sea species of Barathronus Goode & Bean from Brazil, with notes on Barathronus bicolor Goode & Bean (Ophidiiformes: Aphyonidae)

Jørgen G. Nielsen 1  

Michael M. Mincarone 2  

Fabio Di Dario 2  

1Natural History Museum of Denmark, Universitetsparken 15, DK-2100 Copenhagen, Denmark. jgnielsen@snm.ku.dk

2Universidade Federal do Rio de Janeiro (UFRJ), Núcleo em Ecologia e Desenvolvimento Socioambiental de Macaé (NUPEM), CP 119331, 27910-970 Macaé-RJ, Brazil. mincarone@macae.ufrj.br; didario@macae.ufrj.br

ABSTRACT

A new species of Barathronus (Ophidiiformes: Aphyonidae) is described from a single, mature male specimen (101 mm SL) bottom trawled on the continental slope of Rio Grande do Norte, northeastern Brazil, between 1,964 and 2,045 m depth. The new species is diagnosed among congeners by the following combination of characters: peritoneum transparent, deep-set eyes not visible, eight fangs on vomer, anal fin rays 69, predorsal length 42.0% SL, preanal length 49.5% SL, penis long, slender, and lacking a pair of lobes at its base, and presence of a ventral flexure of the anterior 2-3 vertebrae. Additionally, morphological data of three specimens of Barathronus bicolor collected in Brazilian waters are presented and compared with those from 51 specimens from the western Central Atlantic.

Key words: Teleostei; Deep-sea diversity; Potiguar Basin; Western South Atlantic; Brazilian EEZ

RESUMO

Uma nova espécie de Barathronus (Ophidiiformes: Aphyonidae) é descrita a partir de um único exemplar macho (101 mm CP) coletado com arrasto de fundo no talude continental do Rio Grande do Norte, nordeste do Brasil, entre 1.964 e 2.045 m de profundidade. A espécie nova é diagnosticada entre as congêneres pela seguinte combinação de caracteres: peritônio transparente, olhos alojados profundamente e não distinguíveis, oito presas no vômer, nadadeira anal com 69 raios, comprimento pré-dorsal 42,0% CP, comprimento pré-anal 49,5% CP, pênis longo, afilado e sem um par de lobos em sua base, e presença de flexão ventral nas 2-3 vértebras anteriores. Adicionalmente, dados morfológicos dos três espécimes de Barathronus bicolor coletados em águas brasileiras são apresentados e comparados com aqueles de 51 espécimes do Atlântico Central ocidental.

Introduction

The Aphyonidae (Ophidiiformes) is composed of six genera and 22 valid species of mostly small to medium-sized, viviparous, bathypelagic and benthopelagic fishes. Diagnostic features of the family include a loose, transparent and gelatinous skin, poorly developed (or not visible) eyes, basibranchial tooth patches absent, and long dorsal and anal fins joined to the caudal fin (Nielsen et al., 1999). Previous records of the family in the western South Atlantic are restricted to two specimens of Barathronus bicolor Goode & Bean, 1886 and three specimens of Aphyonus gelatinosus Günther, 1878, all collected off southeastern Brazil (Séret & Andreata, 1992; Franco et al., 2007; Franco, 2010).

Barathronus Goode & Bean, 1886 is characterized by having a combination of a scaleless, loose, transparent skin, 29-38 precaudal vertebrae, deep-set eyes, first gill arch with 13-35 long rakers, 9-10 caudal fin rays, and one ray in each pelvic fin. The genus currently includes ten valid species (Nielsen et al., 1999; Nielsen & Møller, 2008).

Four species of Barathronus are reported from the Atlantic Ocean: B. bicolor in the West Atlantic from off South Carolina to off Rio de Janeiro State; B. multidens Nielsen, 1984 from off Florida and Morocco; B. unicolor Nielsen, 1984 from the western North Atlantic (38°28'N, 70°52'W); B. parfaiti (Vaillant, 1888) from between the Azores and France. Nielsen (1969: 53) listed two specimens of B. parfaiti, the holotype (MNHN 86-554) and a 100-mm SL specimen collected in the Azores in 1896 (MOM, uncatalogued). The holotype of B. parfaiti is a poorly preserved 40-mm SL specimen, and few characters stated in the original description of this species can be verified today from examination of the specimen. Additional specimens of Barathronus strongly indicate that the MOM specimen does not belong to B. parfaiti, but rather to an undescribed species of the genus not treated herein. Six species of Barathronus are reported from the Indian and Pacific oceans: B. affinis Brauer, 1906, from off the Maldive Islands, Indian Ocean; B. bruuni Nielsen, 1969, from the western South Indian Ocean; B. diaphanus Brauer, 1906 and B. maculatus Shcherbachev, 1976, both from the Indian and western Pacific oceans; B. pacificus Nielsen & Eagle, 1974, from the eastern North Pacific; B. solomonensis Nielsen & Møller, 2008, known from the Solomon Sea, Pacific Ocean (Nielsen et al., 1999; Nielsen & Møller, 2008).

In 2011, a deep-sea expedition performed by the R/V Seward Johnson on the continental slope off Rio Grande do Norte State, northeastern Brazil, collected several deep-sea fishes, including one specimen of Barathronus taken at approximately 2,000 m depth. Comparison with all valid species of the genus (Tables 1-2) revealed that this specimen belongs to a new species, which is described herein. In addition, a 117-mm male specimen of B. bicolor collected off Rio de Janeiro State, between 990 and 994 m depth, represents the third specimen of the species from the western South Atlantic. The three specimens of B. bicolor from Brazilian waters are compared to specimens from the western Central Atlantic.

Table 1. Meristic and morphometric characters for the western Atlantic species of Barathronus. * From Nielsen (1969; 42 specimens) and Rannou et al. (1975; 9 specimens). ** Based on 10 specimens; tip of rays often broken. 

Species B. linsi B. bicolor B. multidens B. unicolor
Number of specimens holotype 51* 3 holotype + paratype holotype +
17 paratypes
Distribution Brazil western Central Atlantic Brazil North Atlantic western North Atlantic
Standard Length (SL in mm) 101 58-140 73-117 72-83 72-113
Counts
Dorsal-fin rays 78 62-78 70-72 72-ca.75 63-78
Caudal-fin rays 11 9-10 10 10 10
Anal-fin rays 69 51-59 55-58 63- ca.65 55-71
Pectoral-fin rays 21 22-25 22-23 23-24 23-25
Pelvic-fin rays 1 1 1 1 1
Long rakers on anterior gill arch 25 28-33 28-30 23-24 26-29
Precaudal vertebrae 33 31-35 34 32-33 35-38
Total vertebrae 78 70-75 70-71 77-79 78-86
Origin of dorsal fin above vertebra no. 29 23-26 23-25 29-31 29-33
Anterior anal ray below dorsal ray no. 12 15-20 14-18 8-10 7-11
Anterior anal ray below vertebra no. 35 32-35 32-34 36 35-39
Measurements in % SL
Head length 16.0 18.5-22.5 18.0-20.5 17.5 16.0-19.5
Upper-jaw length 9.3 10.0-12.5 10.0-11.0 9.7 9.5-11.5
Predorsal length 42.0 43.5-50.0 42.5-46.0 46.5-51 48.0-54.0
Preanal length 49.5 53.0-60.0 54.0-61.0 55.0 54.0-59.0
Base of pelvic to origin of anal fin 40.5 39.0-49.5 39.5-45.0 34.5-39.0 42.5-48.5
Pectoral-fin length 11.5+ 12.5-20.5** 12.5-14.5 - 15.0-21.5
Pelvic-fin length 14.5 11.0-15.5** 13.0-15.0 - 9.6-11.5

Table 2. Selected diagnostic characters of all valid species of Barathronus. * Specimen is severely damaged, therefore numbers presented are approximations. ** P = Pigmented; T = Transparent. 

Atlantic Indo-Pacific
B. linsi B. bicolor B. multidens B. parfaiti B. unicolor B. affinis B. bruuni B. diaphanus B. maculatus B. pacificus B. solomonensis
Number of specimens 1 51 2 1 18 1 1 6 11 3 1
Sex ♂+♀ juvenile ♂+♀ juvenile ♀ juvenile ♀ ♂+♀ ♂+♀ ♂+♀
Standard Length (SL in mm) 101 58-140 72-83 40 72-113 47 39 59-117 137-230 66-128 100
Dorsal-fin rays 78 62-78 72-ca.75 80-85* 63-78 77 81 64-73 75-82 71-75 -
Anal-fin rays 69 46-59 63-ca.65 60-65* 55-71 67 73 50-59 57-67 62-69 -
Pectoral-fin rays 21 22-25 23-24 21 23-25 22 25 22-23 23-25 25-26 -
Precaudal vertebrae 33 31-35 32-33 37 35-38 34 36 32-33 33-35 37-38 29
Total vertebrae 78 70-75 77-79 84 78-86 78 86 67-75 74-81 83-89 63
Long gill rakers on first gill arch 25 28-33 23-24 27 26-29 20 - 25-30 25-35 28-30 13-14
Total gill rakers on first gill arch 26 - - 29-30* - 24 33 28-31 25-35 31-35 20
Fangs on vomer (right side) 8 1-5 11 - 4 - - 2-4 2-5 6-8 -
Paired lobes at base of penis no no no - yes - - no no yes -
Ventral flexure of anterior vertebrae yes no no - yes yes no no no no -
Peritoneum** T P T - T T P P P P -

Material and Methods

Material examined includes 95 specimens of all valid species of Barathronus and the holotype of the new species described herein (see Comparative Material for a complete list). Measurements and counts (Tables 1-2) follow those of Nielsen et al. (1999). Counts of vertebrae and vertical fin-rays are based on radiographs. Abbreviations: AMS - Australian Museum, Sydney; ASIZP - Academia Sinica, Biodiversity Research Museum, Taipei; BSKU - Kochi University, Department of Natural Science, Faculty of Science, Kochi; CSIRO - Commonwealth Scientific and Industrial Research Organization, Hobart; MNHN - Muséum national d'Histoire naturelle, Paris; MNRJ - Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro; MOM - Musée Oceanographique de Monaco, Monaco; MOVI - Museu Oceanográfico Univali, Piçarras; NPM - Coleção de Peixes, Núcleo em Ecologia e Desenvolvimento Socioambiental de Macaé, Universidade Federal do Rio de Janeiro, Macaé; SAM - South African Museum, Cape Town; USNM - National Museum of Natural History, Washington, D.C.; USU - Universidade Santa Úrsula, Rio de Janeiro; ZIN - Zoological Institute, Russian Academy of Sciences, St. Petersburg; ZMA - Zoölogisch Museum, Universiteit van Amsterdam, Amsterdam; ZMB - Zoologisches Museum, Humboldt-Universität, Berlin; ZMUC - Zoological Museum, Natural History Museum of Denmark, Copenhagen.

Results

Barathronus linsi, new species

urn:lsid:zoobank.org:act:83B15B91-D5A3-4285-90F4-B9AAE6AC9060

Figs. 1-4

Figure 1. Barathronus linsi, new species, holotype, MNRJ 41723, 101 mm SL: (A) recently collected; (B) after two years in preservative (horizontally inverted, right side depicted). 

Figure 2. Sagittal otolith of Barathronus linsi, holotype, MNRJ 41723: (A) median view; (B) ventral view. 

Figure 3. Radiograph of Barathronus linsi, holotype, MNRJ 41723, 101 mm SL. 

Figure 4. Records of Barathronus linsi, holotype (triangle) and Barathronus bicolor (squares) in the western South Atlantic. Selected Brazilian states: RN - Rio Grande do Norte, and RJ - Rio de Janeiro. 

Holotype. MNRJ 41723, 101 mm SL, male with fully developed testes, Brazil, Potiguar basin, off Rio Grande do Norte, 04°25.83'S, 36°37.38'W - 04°25.87'S, 36°36.48'W, 1,964-2,045 m depth, RV Seward Johnson, sta. ArMT84, bottom trawl, 5 June 2011.

Diagnosis. Barathronus linsi can be distinguished from all congeners by the following combination of characters: peritoneum transparent, deep-set eyes not visible, eight fangs on vomer, anal fin rays 69, predorsal length 42.0% SL, preanal length 49.5% SL, penis long, slender, and lacking a pair of lobes at its base, and the ventral flexure of anterior 2-3 vertebrae. Regarding the other Atlantic species of the genus, B. linsi differs from B. multidens by the presence of a ventral flexure of the anterior 2-3 vertebrae (vs. no flexure), eight fangs on vomer (vs. 11), penis in mature males long and slender (vs. short and thick), predorsal length 42.0% SL (vs. 46.5-51.0%), and preanal length 49.5% SL (vs. 55.0%). Barathronus linsi differs from B. bicolor by the number of fangs on vomer (8 vs. 1-5), the ventral flexure of the anterior vertebrae (vs. no flexure), a transparent (vs. bluish) peritoneum, eyes not visible (vs. eyes most often visible), and anal fin rays 69 (vs. 46-59). Barathronus linsi differs from B. unicolor by the number of fangs on vomer (8 vs. 4), predorsal length 42.0% SL (vs. 48.0-54.0% SL), preanal length 49.5% SL (vs. 54.0-59.0% SL), and by the long and slender penis without paired lobes at its base (vs. short and thick penis with lobes). Barathronus parfaiti is known only from a single, poorly preserved, juvenile specimen. However, B. linsi and B. parfaiti are clearly distinct by the number of precaudal (33 vs. 37) and total (78 vs. 84) vertebrae.

Barathronus linsi and the six Indo-Pacific congeners differ in a series of features, which are summarized in Table 2. In addition, no species of Barathronus have so far been recorded in both the Atlantic and Indo-Pacific oceans. Among Indo-Pacific species, B. linsi is most similar to B. affinis (known from a single juvenile specimen) in meristic characters, by the presence of a ventral flexure of the anterior vertebrae, and the transparent peritoneum, but they differ by the number of fangs on vomer (8 vs. 2) and the number of long gill rakers (25 vs. 20).

Description. Meristic and morphometric data of holotype are presented in Tables 1 and 2. Scales absent, skin loose, gelatinous and translucent, sensory pores highly indistinct. Head down-bent, slightly thicker than body. Dorsal, caudal and anal fins united. Dorsal-fin origin well anterior to vertical through midpoint of body, anal-fin origin at midpoint of body. Pelvic fins each with a single, slender ray; pelvic-fin base below hind part of operculum. Pectoral peduncle as broad as long. Eyes not visible. Mouth opening oblique. Nostrils with low rim. Opercular spine covered by skin. Musculi infracarinalis mediales yellowish white; ratio between length and height of "middle fields" (Nielsen, 1969: 9) ca. 0.5. Anterior gill arch with 26 prolonged rakers (up to 2.2% SL): four on upper branch, one in the angle and 21 on lower branch. About 30 very small gill filaments (0.6% SL). Pseudobranchial filaments apparently absent. Testes large (22% SL), nearly filling abdominal cavity. Intromittent organ a 9-mm long slender penis, covered proximally by urogenital hood. Lobes at base of penis absent.

Otolith: Otolith 2.2 mm long, compact, with nearly flat inner face and strongly convex outer face. Outline round, with somewhat depressed predorsal rim. Otolith height 1.2 in length; otolith thickness 1.7 in height. Sulcus moderately large, positioned centrally on inner face and terminating at some distance from otolith rims. A single, undivided, small, narrow colliculum located in anterior part of sulcus. Small bulge on inner face in front of sulcus (Fig. 2).

Dentition: Palatines edentate. Vomer with two small teeth located between eight distally placed fangs (three broken). Premaxilla with 1-2 rows of small teeth in its full length. Dentary with seven fangs on posterior half and small teeth on anterior half.

Axial skeleton: Precaudal vertebrae 33, all centrae short and high, anterior 2-3 vertebrae ventrally flexed. First vertebra with very short neural spine. Vertebrae 2-8 with long and slightly laterally compressed neural spines decreasing in length posteriorly. Short parapophyses developed on vertebrae 4-33. Pleural and epipleural ribs absent. Vertebral centrae hourglass-shaped (Fig. 3).

Color. Recently collected specimen (Fig. 1A) overall yellowish to reddish white due mostly to the underlying, somewhat darker, muscle coloration and blood vessels (mostly skin capillaries). No black pigmentation observed either in skin or on peritoneum. Preserved specimen (Fig. 1B) yellowish white (no evidence of bleaching after two years of preservation).

Distribution. Known from the holotype, collected between 1,965 and 2,045 m depth in the Potiguar basin, of Rio Grande do Norte, northeastern Brazil (Fig. 4).

Etymology. Named after Prof. Jorge Eduardo Lins de Oliveira (Universidade Federal do Rio Grande do Norte - UFRN), in recognition of his lifetime commitment to the understanding of marine biodiversity of northeastern Brazil. A noun in genitive case.

Notes on Barathronus bicolor in the western South Atlantic. A female specimen (73 mm SL) of B. bicolor, collected in 1987 at 610 m depth off Rio de Janeiro State, southeastern Brazil (Séret & Andreata, 1992), represented until recently the single record of this species in the western South Atlantic. Twenty years later, Franco et al. (2007) reported an additional specimen (98 mm SL, male) collected between 1,605 to 1,640 m off Rio de Janeiro State. Meristic and morphometric data of these two specimens and of one additional specimen reported herein (NPM 1243; Fig. 5) are compared to those from the currently known 51 specimens of B. bicolor collected in the western Central Atlantic (Table 1). Morphological characters examined are highly congruent between the two clusters, even though the geographic distance between southeastern Brazil and the western Central Atlantic is more than 5,000 km. The only significant difference between examined characters occurs in the penis length, which measures about 4% SL in the only fully mature male collected off southeastern Brazil (NPM 1243), vs. 10-14% SL in specimens from the western Central Atlantic.

Figure 5. Barathronus bicolor, NPM 1243, 117 mm SL, collected off Rio de Janeiro State, Brazil. Photo taken just after collection. 

Discussion

Records from both the north and south hemispheres show that B. bicolor is widely distributed in the western Atlantic, although a disjunctive distribution cannot be ruled out given that the species has not been recorded in the South Atlantic north of Rio de Janeiro State. The geographic distribution of B. linsi is obviously highly speculative, as the species is known from the holotype. However, it seems reasonable to suppose that B. bicolor occurs off northeastern Brazil, and that therefore the distributions of B. linsi and B. bicolor probably overlap partially. Barathronus linsi was collected at a depth of approximately 2,000 m, whereas B. bicolor is more commonly collected between 500 and 900 m, at least in the western Central Atlantic (Nielsen, 1969; Rannou et al., 1975). If those two benthopelagic species are partially sympatric, it is possible that they might live in different depths on the continental slope.

In the last five years, two new deep-sea species of the Ophidiiformes have been described from Brazilian waters (Nielsen, 2009; this paper), and more than a dozen species of the group were recorded for the first time in the region (Franco et al., 2007; Mincarone et al., 2008; Nielsen et al., 2009). There is also an increase in the knowledge on the diversity of several Brazilian deep-sea fish groups in addition to the Ophidiiformes (e.g., Carvalho et al., 2005; Anderson & Mincarone, 2006; Mincarone & Anderson, 2008; Franco et al., 2009; Melo et al., 2009, 2010; Lima et al., 2011; Mincarone et al., 2014 ). That situation results largely from the fact that only in the last decade collections made in recent fishing surveys performed offshore Brazil started to be properly studied. There is still an immense potential for biological discoveries if those collections are further examined, but more collecting efforts in the region are necessary. However, the relatively few deep-sea fishing surveys conducted in Brazilian waters in the last years, especially after the end of REVIZEE (Program for Assessment of the Sustainable Yield of Living Resources of the Exclusive Economic Zone, Brazilian Government), have been totally focused in regions of deep-water oil drilling, such as the Campos Basin, off Rio de Janeiro State. That situation is not negative in itself, but the knowledge on the Brazilian deep-sea diversity will continue to be geographically fragmented and mostly restricted to the few regions were offshore oil drilling is conducted if more encompassing surveys are not planned for the next years.

Comparative Material. Barathronus affinis, Indian Ocean: 1 specimen (Nielsen, 1969: 48). Barathronus bicolor, western South Atlantic: USU 01502, 1, 73 mm, 23°46.73'S 42°10.05'W, 610 m, 2 Jun 1987; MOVI 38982, 1, 98 mm, 22°12.059'S 39°47.115'W to 22°08.548'S 39°46.994'W, 1,605-1,640 m, 24 Aug 2003; NPM 1243, 1, 117 mm, 21°40.6019'S 39°58.0555'W to 21°37.4510'S 40°00.0988'W, 989.5-994.0 m, 9 Apr. 2008; western Central Atlantic: 51 specimens (Nielsen, 1969; Rannou et al., 1975). Barathronus bruuni, Indian Ocean: 1 specimen (Nielsen, 1969: 51). Barathronus diaphanus, Indo-Pacific Ocean: ZMB 17699, holotype, 117 mm, female, 02°58.8'N 47°6.1'E, 1,289 m, 28 Mar 1899; ZMA 104467, 1, 59 mm, female, 10°48.6'S 123°23.1'E, 918 m, 30 Jan 1900; ASIZP 59-295, 1, 102 mm, female, South China Sea, 1100 m, 13 Jul 1959; Fisheries Research Station Hongkong (uncat.), 1, 92 mm, male, 19°40'N 115°30'E, 732-796 m, 7 Jan 1964; ZMUC P771585, 1, 96 mm, female, 13°45'S 156°41'E, 2,255-2,283 m, 19 Dec 2006; ZMUC P771586, 112 mm, female, 07°25'S 155°44.7'E, 1,012-1,094 m, 27 Dec 2006. Barathronus maculatus, Indo-Pacific Ocean: ZIN 42298, holotype, 157 mm, male, 26°41'S 34°06'E, 1,000 m, 27 Sep 1973; ZIN 45144, 1, paratype, 182 mm, female, 30°16'S 31°18'E, 950-1,050 m, 26 May 1974; USNM 150285, 1, 156 mm, female, 32°05'40"N 138°29'30"E, 386-430 m, 15 Oct 1906; MNHN 1984-371, 1, 144 mm, male, 13°02'S 48°02'E, 1,000-1,525 m, 21 Jan 1975; BSKU 28689, 1, 137 mm, female, 28°53'N, 127°18'E, 820-830 m, 16 Mar 1978; AMS I 24059-013, 1, 187 mm, female, 33°29'S 152°12'E, 942-978 m, 2 Sep 1983; AMS 27711-001, 1, 163 mm, male, 33°50'S 151°57'E, 960-1,050 m, May 1988; AMS 27638, 1, 230 mm, male, 33°44'S 152°06'E 1,020-1,040 m, Jun 1988; SAM 31499, 1, 166 mm, male, 29°43.2'S 31°43.6'E, 645 m, 23 Aug 1988; CSIRO H 1932-01, 1, 200 mm, female, Great Australian Bight, 16 Mar 1989. Barathronus multidens, Atlantic Ocean: 2 specimens (Nielsen, 1984: 583). Barathronus pacificus, Pacific Ocean: 3 specimens (Nielsen & Eagle, 1974: 1067). Barathronus parfaiti, eastern North Atlantic: 1 specimen (Nielsen, 1969: 53). Barathronus solomonensis, Pacific Ocean: 1 specimen (Nielsen & Møller, 2008: 41). Barathronus unicolor, Atlantic Ocean: 18 specimens (Nielsen, 1984: 579).

Acknowledgments

We thank Rob Robins (UF) and Jules Soto (MOVI) for loan of specimens and for providing morphological data, and Marcelo R. Britto (MNRJ) for curatorial assistance. Werner Schwarzhans (Hamburg) prepared the otolith drawing, and Marcus Krag (ZMUC) provided the photo of the preserved holotype. Two anonymous reviewers provided insightful comments to the manuscript. This study is part of the Talude Project, an initiative coordinated by Universidade Federal do Rio Grande do Norte and CENPES/PETROBRAS. Financial support to MMM and FDD was provided by CAPES, FAPERJ and CNPq.

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Received: March 06, 2014; Revised: October 01, 2014; Accepted: March 31, 2015

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