Protodouvillina HARPER et BOUCOT, 1978

Mergl, Michal & Budil, Petr, 2019, Rhynchonelliform Brachiopods And Trilobites Of The ‘ Upper Dark Interval’ In The Koněprusy Area Devonian, Eifelian, Kačák Event; The Czech Republic, Fossil Imprint 75 (1), pp. 92-107 : 95-96

Genus Protodouvillina HARPER et BOUCOT, 1978

T y p e s p e c i e s. Strophomena inaequistriata CONRAD,

1842; Hamilton Group, Eifelian; New York, USA

Protodouvillina cf. interstrialis ( PHILLIPS, 1841) Pl. 1, Figs 1–3

1841 Orthis interstrialis , Leptaena interstrialis ; Phillips, pp. 61, 62, pl. 25, fig. 103a–e.

2009 Protodouvillina interstrialis ( PHILLIPS, 1841) ; Halamski, pp. 53, 54, pl. 3, figs 1–6, 8–17, 19, 20, 30–32, text-fig. 4.

2013 Protodouvillina interstrialis ( PHILLIPS, 1841) ; Halamski and Baliński, pp. 281, 282, fig. 4A–F, L

[for complete synonymy see Halamski (2009) and Halamski and Baliński (2013)]

M a t e r i a l. Two incomplete ventral valves (PCZCU

2261, PCZCU 2263) and one shell fragment (PCZCU 2262).

D e s c r i p t i o n. The unbroken ventral valve is 10 mm wide and 8.8 mm long, but another fragment (Pl. 1, Fig. 3) indicates a larger sized individual of this species. The ventral valve is thin-shelled, subsemicircular in outline, moderately convex in transverse and axial profiles. The maximum width is near the hinge line, cardinal extremities are subrectangular. The interior of the ventral valve has a small muscle field posteriorly divided by a weak ridge (Pl. 1, Fig. 1a). The entire inner surface is densely covered by fine uniformly sized endospines. Ornamentation is parvicostellate, in the ventral valve more strong costellae are separated by much broader interspaces with two to seven finer costellae.

R e m a r k s. The shell is assigned to Protodouvillina HARPER et BOUCOT, 1978 due to the typical parvicostellate ornamentation and moderate convexity of the ventral valve. Similarly shaped P. interstrialis ( PHILLIPS, 1841) is known from the Emsian to the Upper Devonian, with more or less evidenced occurrence in England, Belgium, Spain, Poland and the eastward extension towards the Ural Mts. and Afghanistan ( Halamski 2009). To date, the species was not observed in the Barrandian area but newly presented material may belong to this species. This must be evidenced by a greater number of better preserved specimens.

O c c u r r e n c e. UDI, samples TM 10, TM 12.