Gatunek typowy
Holynetes holynensis Havliček et Racheboeuf, 1979; Mid Devonian, Eifelian; Czech Republic

Opis

Shell weakly to strongly concavoconvex and transversely elongate; spines orthomorph perpendicular on right side of ventral valve only; dorsal interior without median septum and cardinal process pit small, deep and narrow; one pair of narrow, bladelike accessory septa extending from cardinal process pit almost to anterior margin; anderidia isolated on valve floor, anteriorly divergent at 50° to 60°.

Synonimy

Zasięg czasowy

Mid Devonian (Eifelian–Givetian): Europe (Spain, France, Germany, Poland, Bohemia) and Asia (Vietnam).

Literatura