A new fossil fish, Vachalia moraviensis, gen. et sp. nov., is described based on a single articulated specimen collected from lower Oligocene deposits exposed in the vicinity of Kelč, Czech Republic. The morphological analysis of the specimen reveals a series of features that unambiguously support its recognition as a new member of the alepocephaliform family Platytroctidae. Vachalia moraviensis, gen. et sp. nov., is characterized by a very large head; elongate and ribbon-like body; two premaxillary tusks, of which the posterior is distant from the anterior one and almost perpendicular to it; posterior border of the maxilla behind the orbit; two supramaxillae; nine branchiostegal rays; 22 abdominal and 18 or 19 caudal vertebrae; dorsal fin with 16 or 17 rays; pectoral fin reduced and composed of approximately 12 short rays; pelvic fin larger than pectoral fin; and photophores (apparently) absent. The specimen described herein represents the first and only known fossil belonging to the family Platytroctidae based on articulated skeletal remains.

一条新的化石鱼，摩纳哥属。等。nov。是根据从暴露于捷克共和国Kelč附近的下渐新世沉积物中收集的单个关节标本进行描述的。标本的形态学分析揭示了一系列特征，这些特征明确支持其被识别为无头型鸭嘴兽科的新成员。摩拉ach，gen。等。十一月，特点是头很大；细长的带状体；两个上颌前牙，其中后方远离前牙并且几乎垂直于前牙；眼眶后上颌的后边界；两个上颌骨; 九条branch骨 22腹部和18或19尾椎骨；背鳍有16或17条射线；胸鳍减少，由约12条短射线组成；骨盆鳍大于胸鳍；和荧光体（显然）不存在。本文所述的标本代表了基于关节骨骼遗骸的隶属于鸭嘴兽科的第一个也是唯一已知的化石。