Skryjelites auritus gen. et sp. nov. and Quasimolites quasimodo gen. et sp. nov. — two new middle Cambrian hyolithids (? Mollusca) from the Czech Republic Author Valent, Martin Author Fatka, Oldřich Author Szabad, Michal Author Micka, Václav Author Marek, Ladislav text Zootaxa 2015 4007 3 419 426 journal article 10.11646/zootaxa.4007.3.8 566a1607-df5c-4c5f-ba4e-7f1e5f99c772 1175-5326 241042 7BB08011-664C-4437-8A9E-98DB9FD23C32 Skryjelites auritus sp. nov. ( Figs. 2 B, C, 3) 1983 Skryjelites auritus sp. nov. ; Marek, p. 42–43. Holotype . NM L40479 ( Figs. 3 C, D); inner surface of operculum. Paratypes . NM L40721 ( Fig. 3 A); outer surface of operculum. NM L40480 ( Fig. 3 B, E); outer surface of operculum. NM L40725 ( Fig. 3 F); external mould of venter. NM L40720 ( Fig. 3 G); external mould of venter. NM L40724 ( Fig. 3 H); internal mould of conch. NM L40723 ( Fig. 3 I); external mould of dorsum. NM L40722 ( Fig. 3 J); external mould of dorsum. All specimens come from the Buchava locality. Type horizon and locality. Middle Cambrian, Buchava Formation, Skryje Member, Paradoxides (Eccaparadoxides) pussilus Biozone; Barrandian area, Skryje–Týřovice Basin, Buchava locality, Czech Republic ( N 49°56'33.0" , E 13°44'41.8" ). Material. In addition to the holotype , other 18 opercula, some of them incomplete and 13 fragmented conchs. Etymology. From the Latin auritus , long-eared, eared. Diagnosis . The same as for the genus. Description. Conch orthocone; ventral side very slightly arched; dorsal side vaulted in regular arch. W/h index = 1.4. Angle of divergence reaching about 16 degrees. Lateral edges sharp, sharply rounded on moulds. Conch with orthogonal aperture; ligula attaining length of about two thirds of apertural width. Drop-like paired dorsal apertural muscle scars laterally elongated. Ventral apertural muscle scar indistinct transversally elongated, being broken in a very obtuse angle in its middle. Presence of apical septa could not be proved. Oblong lines of transversally broken traverse riblets developed on the dorsal side of the conch ( Fig. 3 S). Very fine growth-lines developed on ventral side of conch ( Fig. 3 R). FIGURE 3. Skryjelites auritus gen. et sp. nov. ; middle Cambrian, Buchava Formation, Skryje Member, Paradoxides (Eccaparadoxides) pusillus Zone, Buchava locality. Scale bar = 1 mm. Skryjelites auritus gen. et sp. nov. A. Paratype, NM L40721, outer surface of operculum. B. Paratype, NM L40480 , outer surface of operculum. C. Holotype, NM L40479, inner surface of operculum. D. Holotype, NM L40479, lateral view of inner surface of operculum. E. Paratype, latex cast of NM L40480 , lateral view of outer surface of operculum. F. Paratype, NM L40725, external mould of venter with distinct growth lines in apertural region. G. Paratype, NM L40720, external mould of venter. H. Paratype, NM L40724, frontal view of internal mould of conch. I. Paratype, NM L40723, external mould of dorsum with distinct sculpture. J. Paratype, NM L40722, external mould of dorsum with distinct sculpture. Monoclaviculate operculum. Narrow clavicles showing asymmetrical T-shaped cross-section. Cardinal processes broadly diverging, with their anterior ends opened; distal ends of cardinal processes cone convoluted and accrued to the surface of cardinal area. Conical shield slightly vaulted; cardinal shield plain. Cardinal area bearing distinct, radially arranged and distally tapered teeth. Surface sculpture consisting of fine growth-lines ( Figs. 2 B, 3G). Dimensions. Maximum length of conch attained about 30 mm . Occurrence. The type species S. auritus sp. nov. is known only from the middle Cambrian of the Skryje–Týřovice Basin at the Buchava, Hradiště, Dlouhá hora and Luh localities ( Figs. 1 , 2A ).