Abstract

The study of the holotype of Striatolamia tchelkarnurensis Glickman, 1964 (Lamniformes: Odontaspididae), presumed to be an invalid species, in the Collection of the State Darwin Museum, described from the Chegan Formation of South Turgay (West Kazakhstan) and including more than 30 isolated teeth from one individual, showed that the species is valid. Morphological characters of the teeth of S. tchelkarnurensis, a terminal taxon of a genus that became extinct in the late Eocene, correspond to the evolutionary trend of the genus—an increase in the size of teeth and an increase in their cutting function due to a change in the shape of the crown and root. The article provides a redescription of the species in accordance with the requirements of the International Code of Zoological Nomenclature (1999).

中文翻译：

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最小的有效纹状体物种Striatolamia tchelkarnurensis Glickman（Elasmobranchii：Lamniformes）

摘要

 1964年在南非达尔文博物馆收藏中对条带状Striatolamia tchelkarnurensis Glickman的整型进行了研究（羊形目：Odontaspididae），该物种被认为是无效物种，描述自南图尔盖（西哈萨克斯坦）的车根组，包括30多个从一个个体中分离出牙齿，表明该物种是有效的。Tchelkarnurensis牙齿的形态特征是始新世末期已灭绝的属的末端分类单元，与该属的进化趋势相对应-由于冠和根的形状发生了变化，牙齿的大小增加了，而其切割功能也增加了。该文章根据《国际动物命名法》（1999年）的要求对物种进行了重新描述。