Gatunek typowy
Skenidioides billingsi Schuchert et Cooper, 1931; near the Ottawa River, (Québec), Canada; Late Ordovician, Sandbian.

Opis

Shell usually planoconvex an coarsely costellate; ventral interarea apsacline to catacline; cardinal process commonly differentiated into shaft and compressed myophore and continuous with median septum that bisects sporadically impressed, subequal quadripartite dorsal adductor scars.

Synonimy

Zasięg czasowy

Early Ordovician (Arenig) to Early Devonian (Lochkovian); cosmopolitan

Literatura