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新属、新种:一种来自意大利中三叠世的披甲主龙形类(爬行纲:主龙形亚目)。

n. gen., n. sp. an armored archosauriform (Reptilia: Archosauromorpha) from the Middle Triassic of Italy.

作者信息

Dalla Vecchia Fabio Marco

机构信息

Mesozoic Research Group, Institut Català de Paleontologia Miquel Crusafont (ICP), Sabadell, Catalonia, Spain.

Museo Friulano di Storia Naturale, Udine, Italy.

出版信息

PeerJ. 2021 Nov 15;9:e12468. doi: 10.7717/peerj.12468. eCollection 2021.

Abstract

is a new archosauriform reptile from the upper Anisian of northeastern Italy represented by a fragment of dorsal armor with a row of neural arches of the dorsal vertebrae. The dorsal armor of the new taxon is composed of two columns of paramedian osteoderms and at least six columns of lateral osteoderms. Unlike other armored archosaurs, the osteoderms are imbricated with the posterior osteoderm overlapping the anterior one. The low neural arches bear small neural spines and long postzygapophyses. The osteoderms of the lateral columns increase in size and change in shape from the most medial to the most lateral columns. Among the Archosauriformes, only the non-archosaur proterochampsians , , and the doswelliids have dorsal armor comprised of more than two columns of osteoderms per side, but the morphology and arrangement of their osteoderms is unlike those of the new Italian taxon. A cladistic analysis of Archosauromorpha positions as either a basal phytosaur or a basal suchian. However, a second cladistic analysis focused on armored archosaurs alternatively positions the new taxon as a basal archosauriform, basal suchian, basal loricatan or crocodylomorph. Better resolution of the phylogenetic relationships of will likely be obtained only with the discovery of cranial and postcranial remains associated with its diagnostic armor elements.

摘要

这是一种来自意大利东北部安尼西阶上部的新的主龙形类爬行动物,由一块带有一排背椎神经弓的背甲碎片所代表。这个新分类单元的背甲由两列中位骨板和至少六列侧位骨板组成。与其他有甲主龙类不同,这些骨板相互叠覆,后一个骨板覆盖在前一个骨板之上。低矮的神经弓带有小的神经棘和长的后关节突。侧列骨板的大小从最内侧列到最外侧列逐渐增大且形状发生变化。在主龙形类中,只有非主龙类的原蜥鳄类、以及杜氏鳄科动物每侧的背甲由两列以上的骨板组成,但其骨板的形态和排列与这个新的意大利分类单元不同。对主龙形类的支序分析将其定位为基础的植龙类或基础的初龙类。然而,另一项专注于有甲主龙类的支序分析则将这个新分类单元定位为基础的主龙形类、基础的初龙类、基础的甲龙类或鳄形类。只有发现与其具有诊断性的甲片元素相关的颅部和颅后遗骸,才可能更好地解析其系统发育关系。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61cc/8601055/42b56c7b35a3/peerj-09-12468-g001.jpg

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