Crassirensselaeria, Schemm-Gregory & Jansen, 2007

Schemm-Gregory, Mena & Jansen, Ulrich, 2007, A new genus of terebratulid brachiopod from the Siegenian of the Rheinisches Schiefergebirge, Acta Palaeontologica Polonica 52 (2), pp. 413-422 : 415

Genus Crassirensselaeria nov.

Derivation of the name: Combination of the genetive of Latin crassus (coarse, thick) with the generic name Rensselaeria .

Type species (by monotypy): Rensselaeria crassicosta Koch, 1881 ; Siegenian (middle Lower Devonian), Rheinisches Schiefergebirge, Germany .

Diagnosis.— Crassirensselaeria differs from the other genera of the family by more globular shells, coarser and less numerous costae (20 to 24 on internal moulds), thicker and longer dental plates, and more strongly developed cardinalia. Ventral muscle field more deeply impressed and basally more narrow. It differs from Lievinella Boucot, 1975 by the absence of a sulcus in both valves and the presence of a dorsal median septum.