Abstract

This article describes Moskovirhynchus robustus gen. et sp. nov., a new genus and species of elephant fish from two Upper Jurassic (Boreal middle Volgian Substage, virgatus Zone) localities of Moscow and the Moscow region, based on isolated mandibular, palatine and vomerine dental plates. The dentition of the new genus bears a morphological resemblance to that of the Recent elephant fish genus Callorhinchus Lacepède, 1798, but is characterized by a mosaic combination of primitive (on palatine tooth plates) and advanced (on both palatine and mandibular plates) dental characters—e.g., presence of asymmetrical bifurcated median tritor on mandibular plates and reduced tritors on palatine plates (an advanced condition for callorhinchids) together with a well-developed aboral area of palatine plate (a primitive condition). The new taxon, known only from dental elements, represents the oldest representative of the Callorhinchidae sensu stricto.

中文翻译：

---

俄罗斯中部晚侏罗世象鱼新属（全头鱼科）

摘要

本文介绍了Moskovirhynchusrobustus gen。等 sp. 十一月，一个新属，并从两个上部侏罗纪（北方中间Volgian台下，象鱼的种类雀鹰区）莫斯科和莫斯科地区的地区，基于分离的下颌，腭和口腔锄骨板。新属的牙列与近代象鱼属Callorhinchus的牙列形态相似Lacepède，1798 年，但其特征是原始（在腭牙板上）和高级（在腭和下颌板上）牙齿特征的马赛克组合——例如，在下颌板上存在不对称的分叉正中 Tritor，在腭板上存在减少的 Tritor（ Callorhinchids 的高级条件）以及发育良好的腭板离岸区域（原始条件）。仅从牙齿元素中得知的新分类群代表了严格意义上的 Callorhinchidae 的最古老的代表。