Holynetes HAVLÍČEK et RACHEBOEUF, 1979

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 : 96

Genus Holynetes HAVLÍČEK et RACHEBOEUF, 1979

T y p e s p e c i e s. Holynetes holynensis HAVLÍČEK et RACHEBOEUF, 1979 ; Choteč Formation, Eifelian; Bohemia, the Czech Republic.

Holynetes cf. holynensis HAVLÍČEK et RACHEBOEUF, 1979 Pl. 2, Figs 1, 2

M a t e r i a l. One incomplete dorsal valve (PCZCU

2272) and one ventral valve (PCZCU 2273).

D e s c r i p t i o n. The shell is concavo-convex, thinshelled, rectimarginate, 3.2 mm wide in the larger specimen, with semicircular outline. The dorsal valve is deeply concave in axial profile and weakly concave in transverse profile, widest at the hinge line. The ventral valve is highly convex in axial profile and mound-like in transverse profile with flattened posterolateral corners. Hinge spines not seen. Ornamentation consists of some 32 to 38 evenly sized and low rounded capillae. New capillae occasionally originate by bifurcation in the dorsal valve. Narrowly triangular posterolateral corners lack radial ornamentation and bear only very fine concentric growth lines.

R e m a r k s. Only limited material is available and it lacks information about the internal features. Based on external morphology only, with some doubts, the shells are referred to Holynetes holynensis HAVLÍČEK et RACHEBOEUF, 1979 . However, the valves of H. holynensis described by Havlíček and Racheboeuf (1979) from the Choteč Formation (horizon with Pinacites jugleri ; Nowakia sulcata Zone ) are larger, from 6.5 mm to 7.7 mm in size and have more numerous capillae than the two shells sampled from the UDI.

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

Suborder Productidina WAAGEN, 1883

Superfamily Linoproductoidea STEHLI, 1954

Family Monticuliferidae MUIR- WOOD et COOPER, 1960

Subfamily Devonoproductinae

MUIR- WOOD et COOPER, 1960