Paleontological Journal ( IF 0.6 ) Pub Date : 2021-05-06 , DOI: 10.1134/s0031030121020027 A. S. Bakaev , V. V. Bulanov
Abstract
A new morphotype of the ray-finned fish scales of the order Eurynotoidiformes (Actinopterygii) is reported from the upper Permian of Eastern Europe and assigned to the species Isadia arefievi A. Minich, 2015, which was initially described based on isolated teeth. Scales of the new morphotype are found in five localities of the Upper Vyatkian Substage, including the uppermost Permian beds of the Zhukovian Regional Stage, characterized by the Vyazniki Tetrapod Assemblage (Archosaurus rossicus Tetrapod Assemblage Zone). The scales of I. arefievi are closely similar to those of I. opokiensis A. Minich et Andrushkevich, 2017, that confirms the hypothesis on both species belong to one phylogenetic lineage (I. opokiensis–I. arefievi). The new finds of I. arefievi indicate a wide distribution of herbivorous fishes with a scraping feeding mode in Vyatkian aquatic vertebrate assemblages.
中文翻译:
伊萨迪亚伊米埃奇·米奇(Actinopterygii,Eurynotoidiformes)的鳞状形态和地层分布
摘要
据报道,东欧上二叠纪有一种新的鳞翅目鱼类鳞片形态,属于Eurynotoidiformes(Actinopterygii)鳞翅目鱼鳞,并被归类为Isadia arefievi A. Minich物种,该物种最初是根据离体的牙齿描述的。新形态型的尺度在上Vyatkian台下的五个地,包括Zhukovian区域舞台的二叠系床,其特点是维亚兹尼基四脚集结号(发现主龙属rossicus四脚组合带)。Arefievi的规模与Opokiensis A.Minich et Andrushkevich,2017的规模非常相似,这证实了这两个物种的假设都属于一个系统发育谱系(I. opokiensis)– I. arefievi)。I. arefievi的新发现表明草食鱼在Vyatkian水生脊椎动物组合中以刮ing式喂养方式广泛分布。