Squalus bucephalus Last, Séret & Pogonoski, 2007

Viana, Sarah T. F. L. & De Carvalho, Marcelo R., 2018, Squalus rancureli Fourmanoir, 1979, a new junior synonym of the blacktailed spurdog S. melanurus Fourmanoir, 1979, and updated diagnosis of S. bucephalus Last, Séret & Pogonoski, 2007 from New, Zoosystema 40 (9), pp. 159-177: 168-171

publication ID

http://doi.org/ 10.5252/zoosystema2018v40a9

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:9D8598BA-0709-4C94-A156-D5BC6D8DA523

DOI

http://doi.org/10.5281/zenodo.3811335

persistent identifier

http://treatment.plazi.org/id/03E487D4-FF92-FFDF-FC8E-2ACDFBB1F838

treatment provided by

Felipe

scientific name

Squalus bucephalus Last, Séret & Pogonoski, 2007
status

 

Squalus bucephalus Last, Séret & Pogonoski, 2007 

Bighead spurdog; Aiguillat à grosse tête

( Figs 9-15View FIGView FIGView FIGView FIGView FIGView FIGView FIG; Tables 2-3)

Squalus bucephalus Last, Séret & Pogonoski, 2007: 23-29  (original description; illustrated. Type by original designation. Type locality Norfolk Ridge, south of New Caledonia, 405-411 m depth). — Ebert et al. 2013: 78, 86 (cited, description; Southwest Pacific Ocean). — Weigmann 2016: 903 (listed; Southwestern Pacific Ocean). — Bernot & Boxshall 2017: 275-276, 288 (cited, listed; New Caledonia).

Squalus  sp. – Séret 1994: 7 (listed; New Caledonia).

MATERIAL EXAMINED. — MNHN-IC-1997-3634, juvenile ♂, 520 mm TL, Norfolk Ridge, New Caledonia, 24°43’1”S, 168°6’0”E, 500-600 m depthGoogleMaps  ; MNHN-IC-1997-3635, juvenile ♀, 476 mm TL, Norfolk Ridge, New Caledonia, 24°43’1”S, 168°6’0”E, 500- 600 m depthGoogleMaps  ; MNHN-IC-1997-3636, juvenile ♀, 495 mm TL, Norfolk Ridge, New Caledonia, 24°43’1”S, 168°6’0”E, 500-600 m depthGoogleMaps  ; MNHN-IC-1997-3641 (paratype of S. bucephalus  ), juvenile ♀, 430 mm TL, Norfolk Ridge, New Caledonia, 23°39’0”S, 167°43’59”E, 420-470 m depthGoogleMaps  ; MNHN-IC-1997-3657, adult ♂, 705 mm TL, New Caledonia, 23°43’1”S, 168°15’0”E, 405-411 m depthGoogleMaps  ; MNHN-IC-1997-3659, adult ♂, 805 mm TL, Stylaster Seamount, Norfolk Ridge, New Caledonia, 23°37’1”S, 167°39’0”E, 486-962 m depthGoogleMaps  ; MNHN-IC-1997-3662, adult ♂, 795 mm TL, Stylaster Seamount, Norfolk Ridge, New Caledonia, 23°36’0”S, 167°40’59”E, 448-880 m depthGoogleMaps  ; MNHN-IC-1998-1017, adult ♂, 810 mm TL, New Caledonia, 23°43’1”S, 168°15’0”E, 405-411 m depthGoogleMaps  ; MNHN-IC-2006-1754 (holotype of S. bucephalus  ), juvenile ♂, 550 mm TL, Norfolk Ridge, south of New Caledonia, 23°43’S, 168°16’E, 405-411 m depth, collected on 28.XI.1993GoogleMaps  ; NMNZ P 34030View Materials (paratypes of S. bucephalus  ), two adult ♂, 787-802 mm TL, Stylaster Seamount, Norfolk Ridge, New Caledonia, 23°35’S, 167°42’E, 448-880 m depthGoogleMaps  .

GEOGRAPHICAL DISTRIBUTION. — Squalus bucephalus  is endemic to New Caledonia in the Southwestern Pacific Ocean ( Fig. 15View FIG).

DIAGNOSIS. — Short-snouted dogfish shark from New Caledonia that it is distinguished from its congeners by: head conspicuously humped dorsal-posteriorly and wide, its width at mouth 13.5% (12.1-13.9%) TL; anterior margin of nostrils conspicuously bilobate and broad; mouth straight and wide, its width 8.7% (7.6-8.8%) TL; caudal fin very slender on upper and lower lobes; caudal fin elongate, its dorsal caudal margin length 24.2% (21.7-23.9%); smaller pelvic-caudal space 24.9% (23.1-

26.3%) TL. It is clearly separated from S. melanurus  by snout conspicuously short, its prenarial length 1.0-1.1 times distance nostril-upper labial furrow (vs snout conspicuously elongate, its prenarial length 1.4-1.7 times distance nostril-upper labial furrow in S. melanurus  ), prespiracular length (12.2-14.0% TL for S. bucephalus  vs 14.7-16.8% TL for S. melanurus  ), and preoral length (9.2-10.9% TL for S. bucephalus  vs 12.6-14.3% TL for S. melanurus  ). It is further distinct from this species by having lower caudal lobe conspicuously white (vs conspicuously black), and dermal denticles unicuspidate and lanceolate (vs tricuspidate and rhomboid). Squalus bucephalus  is also separated from S. melanurus  by number of monospondylous (49 vs 41 for S. melanurus  ), caudal (31 vs 26-29 for S. melanurus  ), and total vertebrae (124 vs 114-120 for S. melanurus  ).

REMARKS

Squalus bucephalus  is a deep-water dogfish shark that occurs in the continental slope between 405-962 m depth, although it is often caught at depths between 405-600 meters. It is a species with very restrict geographical distribution and whose biology is totally unknown. Females are rarely caught in New Caledonia, arousing attention for conservation and fisheries management. Studies on population size and trends, maturation, feeding and reproduction are imperative for threatened assessments of this species.

NMNZ

New Zealand, Wellington, Museum of New Zealand

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Squaliformes

Family

Squalidae

Genus

Squalus

Loc

Squalus bucephalus Last, Séret & Pogonoski, 2007

Viana, Sarah T. F. L. & De Carvalho, Marcelo R. 2018
2018
Loc

Squalus bucephalus Last, Séret & Pogonoski, 2007: 23-29

Last, Seret & Pogonoski 2007: 23 - 29
2007
Loc

Squalus

Linnaeus 1758
1758