Hisingerella sp.

Mergl, Michal, 2012, Lingulate And Craniate Brachiopods From The Top Of The Králův Dvůr Formation (Latest Katian) And Their Contribution To Palaeogeography, Acta Musei Nationalis Pragae Series B 68 (1 - 2), pp. 35-46 : 38-39

Hisingerella sp.

Text-fig. 2O

1982 1989

Conotreta sp. ; Havlíček and Mergl, p. 39, pl. 1, fig. 1. Conotreta sp. ; Štorch and Mergl, table 2.

M a t e r i a l: Three dorsal valves, poorly preserved in claystone (VH 3832, PCZCU 1824, 1825).

D e s c r i p t i o n: Dorsal valve is about 1 mm wide, thin-shelled, mildly convex, circular in outline having the dorsal larval shell distinctly overhanging the posterior margin. Dorsal median septum is tall, thin and long, extending close to the anterior margin of the valve. Ventral valve and other shell details are unknown.

R e m a r k s: The species was reported by Havlíček and Mergl (1982) as Conotreta sp. Conotreta is a late Lower to Upper Ordovician genus (Holmer 2000). Numerous authors used the generic name Conotreta as a provisional standard of reference (Holmer 2000). This is also the case for the dorsal valves collected by Havlíček and Mergl (1982) from the ‘Perník bed’. The morphology of shells from the ‘Perník bed’ correspond more with the morphology of Hisingerella , by the long, thin dorsal septum, almost circular shell outline and posteriorly extended dorsal larval shell.

O c c u r r e n c e: Rare at Jezerka and Praha-Řeporyje.