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

Dapedium Leach属产于德国南部上侏罗统(下侏罗统，下Toarcian)Posidonia页岩中，有3个已知种：D.caelatum QUENSTEDT，D.startatum Agassiz和D.pholidotom(Agas-siz)。该种最近被重新描述，并提出了一个新模式。然而，对其余两个种的分类定义仍然不够充分。斑点杜鹃缺乏正型，而南德斑点杜鹃与英国下利亚斯的斑点杜鹃全息模式明显不同。目前的工作主要集中在所谓的“斑点金龟子”的南德标本，它显然属于一个新的，仍然未被描述的物种。为了描述这一新种，必须将南德标本与点纹盘藻的正模进行比较，后者是近175年前只有阿加西(1835,1836)才研究的，今天被收藏在牛津大学自然历史博物馆(英格兰)。为了鉴定该新种与下二叠世点纹藻的鉴别特征，对点纹藻正型的骨骼解剖和形态进行了研究和分析。

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.