Actinopterygians from the large opencast coal mine in the vicinity of the village of Buxières-les-Mines (Bourbonl’Archambault Basin, Allier, France) are revisited and redescribed based on newly studied specimens. The understanding of the anatomy of Progyrolepis heyleri POPLIN, 1999, originally described by Poplin (1999) on the basis of the upper and lower jaws only, is greatly enhanced and is relatively complete. The anatomy of the palatoquadrate, dermal bones of the skull roof, hyoid arch, operculum, suboperculum, shoulder girdle, cheek bones and branchiostegal rays is described. In addition, new observations have been made on changes in the shape of the maxilla during ontogenesis and microstructure of the teeth. Details of Progyrolepis heyleri scales, including their microstructure and morphology of the ridge scales are provided. The collection of whole individuals, body fragments and numerous isolated bones provide confirmation of the presence of Aeduella blainvillei which is the main component of the actinopterygian fauna in Buxières-les-Mines. Additional new knowledge was obtained regarding the great variability in bones of the opercular apparatus and maxilla, presence of the supraorbital, branchiostegal ray with a conspicuous hyoid process and the direction of mutual overlapping of the suboperculum and branchiostegal ray in Aeduella blainvillei (AGASSIZ, 1833). Microsculpture on the scales is redescribed in this species. Paramblypterus cf. duvernoy is the third member of the actinopterygians in the locality Buxières-les-Mines. Fragments of Paramblypterus are very rare and the bones of the skull roof are presented here. Anatomical features of Progyrolepis heyleri, Aeduella blainvillei and Paramblypterus cf. duvernoy were studied and compared with those of other Devonian and Permo-Carboniferous actinopterygians.
Stanislav Štamberg, Jörg W. Schneider and Ralf Werneburg
Here we present preliminary information on the fossil content of a rediscovered fossiliferous locality in the Late Carboniferous (Stephanian; Kasimovian/Gzhelian) Ploužnice Horizon, Semily Formation, in the Krkonoše Piedmont Basin of the Bohemian Massif. Several meters thick reddish to grey tuffaceous siltstones of this lacustrine horizon contain centimetre thick bone-bed layers and sporadically distributed plant remains. Common are isolated fish remains of actinopterygians, chondrichthyans, and acanthodians as well as isolated insect wings, mainly from blattoids. The biostratigraphic age is determined by blattoid insects as Stephanian B/C (Kasimovian/Gzhelian).