Revision of Dapedium LEACH, 1822 (Actinopterygii, Neopterygii, Halecostomi) from the Lower Jurassic Posidonia Shale of South Germany

Dapedium LEACH存在于德国南部的上Liassic（下侏罗纪，下Toarcian）Posidonia页岩中，有三个已知物种：D. caelatum昆斯特，刺尾拟步行虫D. punctatum AGASSIZ和D. pholidotum（AGAS-SIZ）。D.最近对该种进行了重新描述，并提出了一个新模式。然而，其余两个物种的分类定义仍然不够。D. pholido-tum缺乏正模标本，而德国南部的D. punctatum与D.产于英格兰下利亚地区。目前的工作集中在所谓的“D. punctatum”显然属于一个新的，尚未描述的物种。为了描述新种，必须将德国南部的标本与D. punctatum，迄今为止只有AGASSIZ（1835，1836）在近175年前进行了研究，今天被收藏在牛津大学自然历史博物馆（英格兰）。为了确定新种与下侏罗统D. punctatum的骨骼解剖学和形态学特征。punctatum是要研究和分析。

The actinopterygian (neopterygian) genus Dapedium LEACH is present in the Upper Liassic (Lower Jurassic, Lower Toarcian) Posidonia Shale of Southern Germany with three known species: D. caelatum QUENSTEDT, D. punctatum AGASSIZ and D. pholidotum (AGAS-SIZ). D. caelatum was redescribed recently and a neotype was proposed for the species. However, the taxonomic definition of the remaining two species is still insufficient. D. pholido-tum lacks a holotype, and the South German D. punctatum obviously differs from the holo-type of D. punctatum from the Lower Lias of England. Present work focusses on the South German specimens of the so called “D. punctatum” which obviously belong to a new, still undescribed species. For the description of the new species the South German specimens have to be compared to the holotype of D. punctatum which was studied so far only by AGASSIZ (1835, 1836) nearly 175 years ago and is housed today in the Oxford University Museum of Natural History (England). In order to identify diagnostic characters separating the new species from the Lower Liassic D. punctatum the skeletal anatomy and morphology of the holotype of D. punctatum is to be studied and analysed.