Pseudoscopelus bothrorrhinos Melo, Walker Jr. & Klepadlo 2007

Melo, Marcelo R. S., 2019, A revision of the genus Pseudoscopelus Lütken (Chiasmodontidae: Acanthomorphata) with descriptions of three new species 2710, Zootaxa 2710 (1), pp. 1-78 : 47-49

publication ID

https://doi.org/ 10.11646/zootaxa.2710.1.1

DOI

https://doi.org/10.5281/zenodo.5459821

persistent identifier

https://treatment.plazi.org/id/852E9C20-FFDC-FFDE-FF3C-F95E4F676600

treatment provided by

Felipe

scientific name

Pseudoscopelus bothrorrhinos Melo, Walker Jr. & Klepadlo 2007
status

 

Pseudoscopelus bothrorrhinos Melo, Walker Jr. & Klepadlo 2007 View in CoL

Figures 18 B View FIGURE 18 , 20 C–D View FIGURE 20 , 21 B View FIGURE 21 , 28 J; Table 7.

Pseudoscopelus bothrorrhinos Melo et al. 2007: 41–44 View in CoL View Cited Treatment , figures 7, 8, and 9 [type locality: western Central Pacific   GoogleMaps , 2°51’S, 169°55’ E, holotype LACM 31502-2 View Materials , 45.9 mm].

Pseudoscopelus legandi Lavenberg 1974:197–210 , figures 42–44 [Indian and Pacific Oceans; name not available in accordance to the ICZN 1999].

Pseudoscopelus scutatus View in CoL (non Krefft) Prokofiev and Kukuev 2008: 127–136, figures 184–186 [in part].

Diagnosis. A species of the Pseudoscopelus scutatus species group, which can be distinguished from its congeners by a unique characteristic of photophore pattern: lpf present (vs. lpf absent).

Description. Small-sized species of Pseudoscopelus , largest specimen 55.1 mm SL. Morphometric data summarized in Table 7. General body shape as described for genus with diagnostic characteristics of species and species group.

First dorsal-fin rays vii (11*); second dorsal-fin rays ii+20 (1), ii+21 (8*), ii+22 (2); anal-fin rays ii+20 (1), ii+22 (1), iii+20 (3), iii+21 (6*); pectoral-fin rays 12 (1), 13 (2), 14 (8*); pelvic-fin rays I+5 (11*); caudalfin rays i+7+7+i (1*), i+7+8+i (10). Branchiostegal rays 7 (11*). Pre-caudal vertebrae 17 (1), 18 (9); total vertebrae 35 (1), 36 (13*).

Lateral line complete; lateral-line pores 73 (1), 74 (2), 75 (2), 76 (5*), 77 (1). Pores in temporal canal 2 (11*); supratemporal canal 3 (11*); otic canal 2 (11*); supraorbital canal 6 (11*); supranasal pore 3 (11*); epiphyseal branch 2 (1), 3 (10*); infraorbital canal 12 (10*), 13 (1); preopercular canal 5 (11*); mandibular canal 6 (11*); fifth pore of mandibular canal 1 (11*).

Dentition. Enlarged teeth on premaxilla, dentary and palatine. Teeth arrangement illustrated in Melo et al. (2007). Premaxilla narrow, widest point of premaxillary body 12–14 % in premaxillary length.

Premaxillary teeth on head, neck, body and caudal process. Lateral series of teeth in single longitudinal row, along lateral edge of premaxillary head, neck, body and caudal process; teeth slightly curved. Canine and fang on ventral shelf of premaxillary head. Middle and mesial series on ventral shelf of premaxillary body. Middle series in two irregular, longitudinal rows; teeth needle-like, straight, gradually increasing in size from lateral to medial. Mesial series in single, longitudinal row; teeth needle-like, slightly curved.

Dentary teeth in lateral and mesial series. Lateral series along lateral shelf of dentary, in single, longitudinal row, extending from symphysis to posterior tip; teeth conical, slightly curved. Mesial series on dorsal shelf of dentary, in two, longitudinal rows; teeth straight, needle-like. Palatine teeth 4 (1), 5 (5*), 6 (2), 7 (2), 8 (1); in single, longitudinal row.

Teeth on infrapharyngobranchials and fifth ceratobranchial, conical, curved. Teeth on second basibranchial 5 (1), 6 (3), 7 (2), 8 (2*), 9 (1), 10 (1), 11 (1), conical, in V-shaped or single, irregular row. Teeth absent on basihyal and other basibranchials. Gill rakers on first epibranchial 0 (11*); first ceratobranchial 6 (2*), 7 (5*), 8 (2), 9 (2); first hypobranchial 1 (1), 2 (9*), 4 (1). Gill rakers absent on other elements.

Luminescent organs. Luminescent organs present as discrete photophores on head and body ( Fig. 21 B View FIGURE 21 ). Photophores on head: apf, dnf, inof 1–2, lpf, mxf, vnf, opf, pof and ppf absent; lpf at anterior edge of preopercle, extending dorsally to middle of preopercle; amf in two to three rows, medial to mandibular canal, between second and third pores; pmf in single row, anteriorly medial to mandibular canal, posteriorly lateral to mandibular canal, from forth pore to halfway between fifth and sixth pores.

Photophores on body: lvf, pf, paf, vaf, vf, trf, rtf, scf, and spf absent; if in two rows, from isthmus to ventral edge of cleithrum; prvf in single row, from posterior to cleithrum, connected to ptvf, posteriorly and extending to slightly anterior to anus; svf triangular, anterodorsal to pelvic-fin; free photophores between svf and pectoral fin present or absent; saf in single row, oval, not extending anteriorly to anus, and disconnected posteriorly; prcf two-pronged, prongs extending laterally on lower procurrent rays.

Color. No freshly collected specimen known, most specimens faded to light brown; Body brown or dark brown, except for triangular area on epiphyseal branch. Pectoral, pelvic first and second dorsal, anal and caudal fins hyaline. Internal area of mouth and gill arches pale.

Distribution. In the Equatorial western Central Pacific, off the Gilbert Islands, Papua New Guinea, and Indonesia; from 1° to 4° S, 169° to 129° E. A single record in the western Indian, off the Comoros Islands; from 12° S, 44° E ( Fig. 18 B View FIGURE 18 ).

Bathymetric distribution. Meso- to bathypelagic, from 146 to 1200 m (mean 719 m).

Remarks. Prokofiev and Kukuev (2008) fail to include this species in their revision but listed and illustrated the lot IORAN uncatalogued (1, 27.0, figures 184–186) under P. scutatus , even though the photophores clearly stand for P. bothrorrhinos .

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Perciformes

Family

Chiasmodontidae

Genus

Pseudoscopelus

Loc

Pseudoscopelus bothrorrhinos Melo, Walker Jr. & Klepadlo 2007

Melo, Marcelo R. S. 2019
2019
Loc

Pseudoscopelus scutatus

Prokofiev, A. M. & Kukuev, E. I. 2008: 127
2008
Loc

Pseudoscopelus bothrorrhinos Melo et al. 2007: 41–44

Melo, M. R. S. & Walker Jr., H. J. & Klepadlo, C. 2007: 44
2007
Loc

Pseudoscopelus legandi

Lavenberg, R. J. 1974: 210
1974
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