Channelaxinus, Valentich-Scott & Coan, 2012

Kiel, Steffen, Sami, Marco & Taviani, Marco, 2023, Mollusks (Gastropoda, Bivalvia) from Miocene cold-seep deposits in northern Italy: revisions and additions, European Journal of Taxonomy 910, pp. 115-160 : 142

Channelaxinus ? sp.

Fig. 9D–E

Material examined

ITALY – Emilia-Romagna • 1 spec.; Caselle A; NRM Mo 204840 (L = 20 mm) .

Description

Moderately inflated shell; umbones elevated, small, pointed, prosogyrate; posterior sulcus very close to posterodorsal margin, deep, bordered by sharp ridge; two faint, posterodorsal ridges.

Remarks

With its sharp posterior ridge and groove, and the faint, radial posterodorsal ridge, this specimen resembles Channelaxinus sp. from the Middle Miocene Ca’ Cavalmagra seep deposit ( Kiel & Taviani 2017: 450, fig. 5), and is hence tentatively place in Channelaxinus . With about 20 mm in length Channelaxinus sp. is notably larger than Thyasira sp. 1 and 2 reported above.

Stratigraphic and geographic range

Middle Miocene, northern Italy.

Figures

Fig. 9. Thyasirid bivalves from Calcari a Lucina seep deposits in northern Italy. A–B. Thyasira sp. 1, Castiglione dei Pepoli (MGGC 22311). C. Thyasira sp. 2, Casola (MGGC 22312). D–E. Channelaxinus? sp., Caselle A (NRM Mo 204840).