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首页> 外文期刊>Journal of Systematic Palaeontology >Redescription of Dapedium pholidotum (Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position of Dapedium Leach, 1822
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Redescription of Dapedium pholidotum (Agassiz, 1832) (Actinopterygii, Neopterygii) from the Lower Jurassic Posidonia Shale, with comments on the phylogenetic position of Dapedium Leach, 1822

机译：从下侏罗纪波西多尼亚页岩改写了hol蛇足（（Agassiz，1832）（Actinopterygii，Neopterygii），并评论了ped足浸出的系统发育位置，1822

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摘要

Dapedium pholidotum (Agassiz, 1832) (Actinopterygii, Neopterygii) is redescribed based on new material from the Posidonia Shale (Early Jurassic: Early Toarcian) of Germany. Dapediiformes ord. nov. is introduced for Dapedium Leach, 1822 and other deep-bodied Mesozoic neopterygians. The species diagnosis of D. pholidotum is amended. Comparison with D. stollorum Thies & Hauff, 2011 and D. caelatum Quenstedt, 1858, also from the Lower Jurassic Posidonia Shale, shows that D. pholidotum is unique in having: (1) a length/height ratio of the operculum of c. 0.73, whereas in D. stollorum and D. caelatum this value reaches only c. 0.58; (2) a length/width ratio of the gular plate of c. 1.6, whereas in D. stollorum and D. caelatum this value is 1.3; (3) 27 or more caudal fin lepidotrichia, whereas in D. stollorum and D. caelatum there are 24 and 25 lepidotrichia, respectively; (4) at least 26 dorsal fin lepidotrichia, whereas D. stollorum and D. caelatum possess only 24 dorsal fin lepidotrichia each; and (5) a length/height ratio of the flank scales immediately behind the operculum of 0.37, whereas in D. stollorum and D. caelatum this ratio ranges around 0.31 and 0.5, respectively. A cladistic analysis based on modification of a previously published taxon-character matrix shows that Dapedium is the sister group of the ginglymodian fishes [Semionotiformes + Lepisosteiformes], The generic diagnosis of Dapedium Leach, 1822 is amended.
机译：根据德国波西多尼亚页岩（侏罗纪早期：早期的Toarcian）的新材料，重新描述了ped足ped（Agassiz，1832年）（Actinopterygii，Neopterygii）。梯形兽ord。十一月为1822年的Dapedium Leach和其他强壮的中生新翅目昆虫引入。修改了D. Pholidotum的物种诊断。与D. stollorum Thies＆Hauff（2011）和D.caelatum Quenstedt（1858）（同样来自下侏罗纪波西多尼亚页岩）的比较表明，D。pholidotum具有以下独特之处：（1）c孔的长/高比。 0.73，而在D. stollorum和D. caelatum中，该值仅达到c。 0.58； （2）c的口板的长宽比。 1.6，而在D. stollorum和D. caelatum中，此值为1.3； （3）尾鳍鳞翅目鱼类有27个或更多，而D. stollorum和D. caelatum分别有24和25个鳞翅目鱼类。 （4）背鳍鳞翅目至少有26个，而stollorum和D. caelatum分别只有24个背鳍鳞翅目。 （5）紧靠the的后侧鳞鳞的长/高比为0.37，而在D. stollorum和C. caelatum中，该比分别在0.31和0.5左右。基于对先前公布的分类单位-字符矩阵进行修改的分类分析表明，Da是牙龈鱼类的姐妹群[Semionotiformes + Lepisosteiformes]。修改了Dapedium Leach（1822年）的一般诊断。

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