Progyrolepis FRITSCH , 1895

Štamberg, Stanislav, 2013, Knowledge Of The Carboniferous And Permian Actinopterygian Fishes Of The Bohemian Massif - 100 Years After Antonín Frič, Acta Musei Nationalis Pragae Series B 69 (3 - 4), pp. 159-182 : 163

Genus Progyrolepis FRITSCH, 1895

T y p e s p e c i e s: Progyrolepis speciosus ( FRIČ, 1875) .

I n c l u d e d s p e c i e s: Progyrolepis heyleri POPLIN, 1999 from the Early Permian of Buxières-les-Mines (Massif Central) beside the type species .

D i a g n o s i s (after Štamberg 1991, emended): Fish approximately 60 cm long. Lepidotrichia of pectoral fins unjointed in their proximal part, distally articulated and dichotomously branched. Endocranium ossified. Frontal 2.5 times longer than wide, sculpture formed by conspicuous tubercles. Rostral region of head conspicuously convex orally, comprising large single postrostral, paired nasal and rostro-premaxillar. Rostro-premaxillary with teeth. Medial side of the palatoquadratum formed by entopterygoid, ectopterygoid, dermometapterygoid and small dermopalatines. Maxilla with long and low maxillary plate. The sculpture on the maxilla is formed by conspicuous tubercles and ridges. Lower jaw very stout. Dentition comprising two types of teeth in two rows. The preoperculum is conspicuously bent and inclined anteriorly. The angle of the obliqueness of the preoperculum is 27°; angle of preoperculum bend is 137°. Orbit small and placed anteriorly. Oval operculum, three times higher than long. Operculum obliqueness angle is 30°. Square suboperculum. Triangular accessory operculum tightly placed in space among operculum, suboperculum and preoperculum. Numerous branchiostegal rays. Rhomboidal scales small, stout, and sculptured by several ridges. Posterior margin of scales not serrated .

R e m a r k s: Poplin (1999) described a new species Progyrolepis heyleri based on isolated jaws from the Buxières-les-Mines locality (French Massif Central). It differs from P. speciosus in a more elongated maxillary plate, sculpture in the anterior region of the maxillary plate and sculpture on the conical teeth. However, Progyrolepis tricessimalaris , described by Dunkle (1946) from the Early Permian of Texas is distinct from the genus Progyrolepis in the shape of the maxilla and preoperculum ( Štamberg 1991).