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A new pearleye (Teleostei, Aulopiformes) species from the Oligocene of Romania
Annales de Paléontologie ( IF 1.0 ) Pub Date : 2019-02-13 , DOI: 10.1016/j.annpal.2019.01.001
Ionuţ Grădianu , Tomáš Přikryl , Dorin Sorin Baciu , Giorgio Carnevale

A new pearleye species of the alepisauroid family Scopelarchidae, Scopelarchoides neamticus sp. nov., is described herein based on two specimens from the Oligocene Lower Dysodilic Shales Formation, cropping out in the Pietricica Mountain, Romanian Eastern Carpathians. The new species described herein exhibits a unique combination of features (including head length about 25% of SL; coracoid remarkably expanded; both preorbital and postorbital lengths larger than orbit diameter; 50 or 51 vertebrae; dorsal fin with nine or ten rays; anal-fin with 28 rays; length of anal fin base about 30% of SL; preanal distance almost 60% of SL; pelvic fin insertion located just under the second dorsal fin ray; pectoral fins only slightly longer than pelvic fins; caudal fin with 19 principal rays plus 14 upper and 13 lower procurrent rays) that justifies its recognition as a new species of the genus Scopelarchoides. Both morphological and meristic features suggest a certain degree of similarity between S. neamticus sp. nov. and the extant species Scopelarchoides signifer. The fossils of the new Oligocene species described herein represent the oldest known skeletal record of Scopelarchidae.



中文翻译:

罗马尼亚渐新世的一种新的珍珠眼(Teleostei,Auropiformes)种

刺龙科的新的珍珠眼种类Scopelarchidae,Scopelarchoides  neamticussp。本文根据来自渐新统下二叠统页岩层的两个标本进行了描述,这些标本是在罗马尼亚东部喀尔巴阡山脉的Pietricica山中种植的。本文所述的新物种展现出独特的特征组合(包括头长约SL的25%;喙突显着扩张;眶前和眶后长度均大于轨道直径; 50或51椎骨;背鳍有9或10根射线;肛门-鳍有28射线;肛门鳍基部的长度约为SL的30%;肛门前距离接近SL的60%;骨盆鳍插入位于第二个背鳍射线的正下方;胸鳍仅比骨盆鳍稍长;尾鳍主要有19个射线加上14条上部射线和13条下部下部射线),证明其被识别为Scopelarchoides属的新物种。形态和亲缘特征都表明S.  neamticus sp。之间存在一定程度的相似性。十一月 和现存种类Scopelarchoides  signifer。本文所述的新渐新世物种的化石代表了Scopelarchidae的最古老的已知骨架记录。

更新日期:2019-02-13
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