A new genus of ionoscopiform fish (Halecomorphi) from the Lower Cretaceous (Albian) lithographic limestones of the Tlayua quarry, Puebla, Mexico
A new genus of ionoscopiform fish (Halecomorphi) from the Lower Cretaceous (Albian) lithographic limestones of the Tlayua quarry, Puebla, Mexico
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DOI：
10.1666/04-152.1
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发表时间：
2008-01-01
影响因子：
1.4
通讯作者：
Espinosa-Arrubarrena, Luis
中科院分区：
文献类型：
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作者：
Alvarado-Ortega, Jesus;Espinosa-Arrubarrena, Luis
佩氏蛇鳗根据采自墨西哥普埃布拉Tepexi de Rodriguez附近Tlayua采石场下白垩统（中-上阿尔布阶）石灰岩的5个标本，对该属和种进行了描述。这一新的分类单元显示了lonoscopiformes的特征，因此将其指定为该目中生代鱼类的新成员。此外，Quetzalichthys n.与Ionoscopus和Oshunia共享几个衍生特征，包括存在超过15条上神经，坚固且骨化良好的单脊椎，具有两个侧面纵向卵圆窝，薄的amioid型鳞片，以及一些眶周骨的腹面强烈凹陷。佩氏绿鳍鱼具有三个独特的特征：26个腹部中心，21个主背鳍条和两个眶上。此外，它的不成对的鳍和尾巴显示出与Ionoscopus和Oshunia的中间状态。一个分支分析，lonoscopiformes，包括两个分类群中发现的Tlayua采石场（Quetzalichthys和Teoichthys），确定了两个单系家庭的顺序，Ophiopsidae（包括Ophiopsis，Macrepistius，Teoichthys）和Ionoscopidae（涉及Ionoscopus，Oshunia和Quetzalichthys）。
Quetzalichthys perrilliatae n. gen. and sp. is described based on five specimens from Lower Cretaceous (Middle-Upper Albian) limestones of the Tlayua Quarry, near Tepexi de Rodriguez, Puebla, Mexico. This new taxon displays the diagnostic characters of lonoscopiformes, which consequently designate it as a new member of this order of Mesozoic fishes. Additionally, Quetzalichthys n. gen. shares several derived characters with Ionoscopus and Oshunia, including the presence of more than 15 supraneurals, solid and well-ossified monospondylous vertebrae with two lateral longitudinal oval fossae, thin scales of the amioid type, and the ventral surface of some circumorbital bones being intensely pitted. Quetzalichthys perrilliatae is characterized by three unique characters: 26 abdominal centra, 21 principal dorsal fin rays, and two supraorbitals. Additionally, its unpaired fins and tail show conditions intermediate to those found in Ionoscopus and Oshunia. A cladistic analysis, of lonoscopiformes, including both taxa found in the Tlayua Quarry (Quetzalichthys and Teoichthys), identifies two monophyletic families within the order, Ophiopsidae (including Ophiopsis, Macrepistius, Teoichthys) and Ionoscopidae (involving Ionoscopus, Oshunia, and Quetzalichthys).