Hymenogadus Gilbert & Hubbs, 1920

Schwarzhans, Werner, 2014, Head and otolith morphology of the genera Hymenocephalus, Hymenogadus and Spicomacrurus (Macrouridae), with the description of three new species, Zootaxa 3888 (1), pp. 1-73 : 23-24

publication ID

https://doi.org/10.11646/zootaxa.3888.1.1

publication LSID

lsid:zoobank.org:pub:1B437AE1-CF28-4C1B-95B6-C31A295905A0

DOI

https://doi.org/10.5281/zenodo.10238815

persistent identifier

https://treatment.plazi.org/id/463A8F36-FFA6-FFEF-1297-9EA9E3F2FD50

treatment provided by

Felipe (2021-06-15 04:07:37, last updated 2023-12-01 02:02:54)

scientific name

Hymenogadus Gilbert & Hubbs, 1920
status

 

Hymenogadus Gilbert & Hubbs, 1920 View in CoL View at ENA

Hymenogadus Gilbert & Hubbs, 1920: 521 View in CoL , as subgenus of Hymenocephalus Giglioli, 1884 View in CoL , type species by original designation Hymenocephalus gracilis Gilbert & Hubbs, 1920 View in CoL .

Hymenogadus: Okamura, 1970: 58 View in CoL .

Hymenocephalus: Marshall & Iwamoto, 1973: 602 View in CoL ; Sazonov & Iwamoto, 1992: 55; Iwamoto & Merrett, 1997: 518.

Diagnosis. Modified from Okamura (1970). First spine of dorsal fin serrated. Ventral striae consisting of fine parallel lines of dark, alternating with silvery pigment associated with a light-producing function on abdominal wall, parts of chest, and shoulder girdle, not joint at median line behind pelvic fin bases. Head cavernous, with moderately thin skin cover. Median and lateral processes of snout sharply pointed, not plate-like. Gill rakers 10–19. Additional diagnostic features from axial skeleton and head morphology are: 11–12 precaudal vertebrae (based on radiographs). Widening of sensory canal systems on head; development of incipient infranasal, infraorbital and preopercular supporters; Hymenocephalus -like snout with broad, blunt, soft tip. Additional diagnostic features from otolith morphology are: Moderately elongate shape of otoliths (OL:OH = 1.25–1.55); elevated, but short predorsal lobe; ventral sulcus margin at collum indented; pseudocolliculum indistinct, short.

Comparison. Hymenogadus resembles Spicomacrurus in a number of aspects, such as body shape, extent of ventral striae not joined behind the pelvic fin bases, otolith with an indented ventral sulcus margin at the collum, and short, indistinct pseudocolliculum. Certain other characters remind of the status seen in Hymenocephalus , such as the widening of the sensory canal system on the head, albeit covered by a thicker more robust skin than in Hymenocephalus , the lack of the spatulate nasal bones, the incipient developments of infranasal, infraorbital and preopercular supporters and the expanded, though short predorsal lobe in the otoliths.

Species. Two species, one nearly cosmopolitan ( H. gracilis ), except for Hawaii, where it is replaced by the second, probably endemic species ( H. tenuis ).

Giglioli, E. H. (1884) Issel Pelagos. Saggi sulla vita e sui prodotti del mare. Tipografia del R. Istituto de' Sordo-Muti, Genoa, 436 pp. http: // dx. doi. org / 10.5962 / bhl. title. 42527

Gilbert, C. H. & Hubbs, C. L. (1920) The macrouroid fishes of the Philippine Islands and the East Indies. United States National Museum Bulletin, 100 (1), 369 - 588. http: // dx. doi. org / 10.5962 / bhl. title. 13637

Iwamoto, T. & Merrett, N. R. (1997) Pisces Gadiformes: Taxonomy of grenadiers of the New Caledonian region, southwest Pacific. Memoires du Museum national d'Histoire naturelle, 176, 473 - 570.

Marshall, N. B. & Iwamoto, T. (1973) Genus Hymenocephalus. In: Cohen, D. M. (Ed.), Fishes of the Western North Atlantic. Memoires of the Sears Foundation Marine Research, 1 (6), 601 - 612.

Okamura, O. (1970) Fauna Japonica. Macrourina (Pisces). Academic Press of Japan, Tokyo, pp. 1 - 216.

Sazonov, Y. I. & Iwamoto, T. (1992) Grenadiers (Pisces, Gadiformes) of the Nazca and Sala y Gomez Ridges, southeastern Pacific. Proceedings of the California Academy of Sciences, 48 (2), 27 - 95.

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Gadiformes

Family

Macrouridae