安徽巢湖下三叠统初始巢湖裂齿鱼的再研究

初始巢湖裂齿鱼(Chaohuperleidus primus)产自安徽省巢湖市马家山采石场南陵湖组上段地层(早三叠世奥伦尼克期斯帕斯亚期),由于模式材料保存很差,其骨骼学特征未被完整地记述.依据模式材料及同一层位发现的3件保存完整的新材料,补充描述初始巢湖裂齿鱼的骨骼解剖信息,修正其属征,复原其头骨的骨骼模式.修正后的...

Redescription of Chaohuperleidus Primus (Actinopterygii,Perleidiformes) from Lower Triassic of Anhui Province,South China

Chaohuperleidus primus has yet to be completely described due to the limit of the original material which were collected from Upper Member of the Nanlinghu Formation (Spathian, Olenekian, Early Triassic) at Majiashan quarry, Chaohu City, Anhui Province. The taxon was redescribed in detail by adding three complete specimens from the type horizons. The generic diagnosis of Chaohuperleidus was revised mainly based on newly recognized anatomical information, of which the following characters ‘the fused parietal and dermopterotic with anterior, middle and posterior pit-lines; the operculum and suboperculum of nearly equal in height with the latter having a large rounded anterior dorsal process’ were possible apomorphies of Chaohuperleidus. The previous taxonomic assignment of the Chaohuperleidus was confirmed, which was similar to the Ladinian (Middle Triassic) genus Perleidus but differed the latter in having more suborbitals, branchiostegal rays and epaxial fin rays besides its possible apomorphies. The skull pattern of the Chaohuperleridus primus was exhaustively reconstructed and was anatomically compared with the Early Triassic taxa which were wrongly classified into the Perleidiformes and some newly described stem neopterygians. The result herein will provide new anatomical evidences for the phylogeny analysis of the stem neopterygians that is open to discuss.