Hymenocephalus (fish)

Hymenocephalus is a genus of rattails.

Species
There are currently 27 recognized species in this genus:
 * Hymenocephalus aeger C. H. Gilbert & C. L. Hubbs, 1920 (Plain-tail whiptail)
 * Hymenocephalus antraeus C. H. Gilbert & Cramer, 1897
 * Hymenocephalus aterrimus C. H. Gilbert, 1905 (Blackest whiptail)
 * Hymenocephalus barbatulus C. H. Gilbert & C. L. Hubbs, 1920
 * Hymenocephalus billsam N. B. Marshall & Iwamoto, 1973
 * Hymenocephalus fuscus P. J. McMillan & Iwamoto, 2014 (Black membranehead)
 * Hymenocephalus grimaldii M. C. W. Weber, 1913
 * Hymenocephalus hachijoensis Okamura, 1970
 * Hymenocephalus heterolepis (Alcock, 1889)
 * Hymenocephalus italicus Giglioli, 1884 (Glass-head grenadier)
 * Hymenocephalus iwamotoi Schwarzhans, 2014 (Iwamoto's whiptail)
 * Hymenocephalus lethonemus D. S. Jordan & C. H. Gilbert, 1904
 * Hymenocephalus longibarbis (Günther, 1887) (Long-barb whiptail)
 * Hymenocephalus longipes H. M. Smith & Radcliffe, 1912
 * Hymenocephalus maculicaudus P. J. McMillan & Iwamoto, 2014 (Spotty-tail membranehead)
 * Hymenocephalus megalops Iwamoto & Merrett, 1997 (Big-eye whiptail)
 * Hymenocephalus nascens C. H. Gilbert & C. L. Hubbs, 1920 (Nascent membranehead)
 * Hymenocephalus neglectissimus Sazonov & Iwamoto, 1992
 * Hymenocephalus nesaeae Merrett & Iwamoto, 2000
 * Hymenocephalus papyraceus D. S. Jordan & C. H. Gilbert, 1904
 * Hymenocephalus punt Schwarzhans, 2014
 * Hymenocephalus sazonovi Schwarzhans, 2014
 * Hymenocephalus semipellucidus Sazonov & Iwamoto, 1992
 * Hymenocephalus striatissimus D. S. Jordan & C. H. Gilbert, 1904
 * Hymenocephalus striatulus C. H. Gilbert, 1905
 * Hymenocephalus torvus H. M. Smith & Radcliffe, 1912
 * Hymenocephalus yamasakiorum Nakayama, Endo & Schwarzhans, 2015 (Black-tailed membranehead)