Celsiorthis, Paterson & Brock, 2003

Paterson, John R. & Brock, Glenn A., 2003, Early Ordovician Orthide Brachiopods from Mount Arrowsmith, Northwestern New South Wales, Australia, Records of the Australian Museum 55 (2), pp. 221-230 : 223

Celsiorthis n.gen.

Type species. Celsiorthis bulancis n.gen. and n.sp.

Etymology. Latin, m., celsus, high, upright; referring to the high, steeply apsacline to catacline ventral valve interarea.

Diagnosis. Shell ventribiconvex. Ventral valve interarea wide, high, steeply apsacline to catacline. Finely costellate becoming ramicostellate anteriorly, with costellae arising mainly by bifurcation (number of costellae ranges from 80– 90 at anterior margin). Ventral valve with large dental plates and bilobed muscle field. Dorsal valve with broad, welldeveloped notothyrial platform occupied by ridge-like cardinal process. Brachiophores tusk-like with thick bases, weakly divergent (40–60°). Dental sockets large. Fulcral plates absent.