Channelaxinus Valentich-Scott & Coan, 2012

Oliver, P. Graham & Frey, Melissa A., 2014, Ascetoaxinus quatsinoensis sp. et gen. nov. (Bivalvia: Thyasiroidea) from Vancouver Island, with notes on Conchocele Gabb, 1866, and Channelaxinus Valentich-Scott & Coan, 2012, Zootaxa 3869 (4), pp. 452-468 : 466-467

Genus Channelaxinus Valentich-Scott & Coan, 2012 in Coan and Velentich-Scott, 2012

Type species. Channelaxinus oliveri Valentich-Scott & Coan, 2012 in Coan and Velentich-Scott , 2012

Type locality. Bahía Santiago , Colima, México; 19°06´24´´N, 104°22´28´´W; 10fm (= 18m) .

Species included. Channelaxinus oliveri Valentich-Scott & Coan, 2012 ; Thyasira excavata Dall, 1901 [= Conchocele excavata ( Dall, 1901) in Coan & Valentich-Scott, 2012]; Thyasira perplicata Salas, 1996 ; Cryptodon investigatoris Smith, 1895 (tentative placement).

Diagnosis. Moderate to large shells. Polygonal, higher than long. Beaks small, pointed, strongly prosogyrous. Anterior margin sloping long with a deeply impressed lunule, filling much of the anterior area. Posterior sulcus prominent and deep; submarginal sulcus well developed, very narrow to prominent. Median slope flattened, bounded by low ridges. Sculpture of commarginal striae. Hinge edentulous. Ligament long, narrow, sunken.

Anatomy of type species unknown. Following diagnosis based on C. excavata and C. perplicata . Anterior adductor muscle much longer than posterior; mantle unfused except for a small exhalant aperture; foot vermiform with a bulbous toe; ctenidia of two fully reflected demibranchs, filaments laminar with fully ciliated frontal faces, abfrontal surfaces lined with bacteriocytes; lateral body pouches densely arborescent; dorsal digestive gland slightly protruding.