Trypauchen Valenciennes in Cuvier & Valenciennes,

Edward O. Murdy, 2006, A revision of the gobiid fish genus Trypauchen (Gobiidae: Amblyopinae)., Zootaxa 1343, pp. 55-68: 55-56

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Trypauchen Valenciennes in Cuvier & Valenciennes


[[ Trypauchen Valenciennes in Cuvier & Valenciennes  ZBK  ]]


Gobius vagina  ZBK  was described by Bloch and Schneider (1801) from a single specimen collected in Tranquebar, India. The original description was brief, but stated that an ovalshaped opening was present on the dorsal edge of the operculum. Because of this unusual, pouch-like structure at the dorsal margin of the operculum, Valenciennes in Cuvier and Valenciennes (1837) erected the genus Trypauchen  ZBK  [from the Greek trypa (hole) and auchen (neck)] for Gobius vagina  ZBK  . The function of the opercular pouch is not known, but this structure is only found in the following genera of Amblyopinae: Amblyotrypauchen  ZBK  , Ctenotrypauchen  ZBK  , Trypauchen  ZBK  , and Trypauchenichthys  ZBK  .

Trypauchen vagina  is locally abundant in certain regions and is even used as a food source (Rainboth, 1996), but it has been little studied. However, records and brief descriptions of T. vagina  are numerous: India (Day, 1878; Hora, 1924); Thailand (Fowler, 1935; H.M. Smith, 1945); Singapore (Larson and Lim, 2005); Mekong River (Rainboth, 1996); various parts of Indonesia (Bleeker, 1860; Kottelat et al., 1993); China (Richardson, 1844; Günther, 1861; Rendahl, 1924; Herre, 1927); and Taiwan (Chen and Fang, 1999).

In addition to T. vagina  , four other species were described and assigned to Trypauchen  ZBK  : T. microcephalus Bleeker, 1860  ZBK  ; T. raha Popta, 1922  ZBK  ; T. taenia Koumans, 1953  ZBK  ; and T. wakae Jordan & Snyder, 1901  ZBK  . All were described from Indonesian specimens, except for T. wakae  ZBK  , which was described from Japan.

In his major work on the gobioid fishes of the Indo-Australian Archipelago, Koumans (1953) provided the only systematic review of Trypauchen  ZBK  to date. Koumans (1953) included T. raha  ZBK  , T. taenia  ZBK  , and T. vagina  in his treatment of Trypauchen  ZBK  . Trypauchen wakae  ZBK  was likely excluded because it was only known from Japan and T. microcephalus  ZBK  was placed in Ctenotrypauchen  ZBK  by Koumans. Koumans (1953) separated the three species of Trypauchen  ZBK  by numbers of longitudinal and transverse scale rows. However, based on examination of the types and/or images of the types, differences in pelvic fin structure, scalation, and osteology between T. vagina  and its putative congeners are evident. Consequently, I propose herein a new diagnosis for Trypauchen  ZBK  and that Trypauchen  ZBK  comprises only two species: T. vagina  and an undescribed species from Myanmar, Malaysia, Thailand, Vietnam, and China.