Pseudoscopelus astronesthidens Prokofiev & Kukuev, 2006
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publication ID |
https://doi.org/ 10.26028/cybium/2021-453-001 |
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persistent identifier |
https://treatment.plazi.org/id/F625A326-FFF1-E658-4539-FEA1FD42FECD |
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treatment provided by |
Felipe |
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scientific name |
Pseudoscopelus astronesthidens Prokofiev & Kukuev, 2006 |
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Pseudoscopelus astronesthidens Prokofiev & Kukuev, 2006 View in CoL
A linebelly, Chiasmodontidae ( Fig. 6 View Figure 6 ), was collected on 24 Oct 2019 during the EVHOE survey, using a pelagic trawl. The specimen was collected in the southern Bay of Biscay (45.8346 / 45.7998 °N, 3.8477 / 3.9131 °W), at Station X0453, at 670-716 m depth above a 1506-1758 m depth continental slope. The fresh specimen measured 220 mm TL, 202 mm FL, 185 mm SL, 58 mm HL and weighed 58.5 g. It is characterized by a relatively elongate head. D1: VIII, D2: 27, P: 12, V: I+5, A: 29. Orobranchial cavity dark; teeth in the marginal row on the premaxilla inclined and increased in size in the postorbital portion of the bone; teeth on the tongue present ( Fig. 6C View Figure 6 ); maxillary (suborbital) photophores (mxf) well developed, mxf disconnected with anteropreopercular photophores (apf), apf and posteropreopercular photophores (ppf) well developed ( Fig. 6B View Figure 6 ), transverse ventral (interventral) photophores (trf) absent, isthmus photophores (if) present, prepelvic-fin photophores (prvf) well developed, ventral axillary photophores (vaf) and postpelvic-fin photophores (ptvf) well developed, anal-fin photophores (saf) forms Y-shaped aggregation of organs behind the anus, disconnected from the linear groups of organs along the base of the anal fin ( Fig. 6D View Figure 6 ); precaudal (infracaudal) photophores (prcf) in a well-developed horseshoe shaped group of organs ( Fig. 6E View Figure 6 ); mandibular photophores consist of two groups: a short group of anteromaxillary photophores (amf) at the level of second and third pores of the mandibular laterosensory canal, and a long posterior group of posteromandibular photophores (pmf) ( Fig. 6F View Figure 6 ); cranial roofing bones thin, group of three pores above the second nare ( Fig. 6G View Figure 6 ); upper jaw long, 67.0% head length; pectorals moderately long, 16.9% SL; The specimen was preserved with the collection No. MNHN-IC 2021-0148 and a tissue sample was preserved under No. BPS-4262. Recorded by J. Spitz and S.P. Iglésias. The present species is clearly distinct from Pseudoscopelus altipinnis Parr, 1933 recorded for the first time in French waters in 2018 ( Iglésias et al., 2020), Pseudoscopelus obtusifrons (Fowler, 1934) listed in the “Checklist of the marine fishes from metropolitan France ” ( Béarez et al., 2017) and Pseudoscopelus pierbatus Spitz, Quéro & Vayne, 2007 described from the Bay of Biscay, all of them characterized by a relatively round head. The maximumrecorded length for the species was 170.2 mm SL ( Melo, 2010). Thus, the present specimen constitutes a new maximum size for the species. Pseudoscopelus astronesthidens is mostly known from the western North Atlantic Ocean, off USA and Canada. The current specimen is the second record for European waters and the northeastern Atlantic Ocean. A specimen (paratype, AtlantNIRO nr. 26) was previously recorded at Rockall Bank, in the UK EEZ (57.6250°N, 15.7861°W), at 610 m depth ( Prokofiev and Kukuev, 2006). This species is an addition to the “Checklist of the marine fishes from metropolitan France ” ( Béarez et al., 2017).
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