Paleontological Journal最新文献_第3页

Ancient Species of the Genus Dvinosaurus (Temnospondyli, Dvinosauria) from the Permian Sundyr Tetrapod Assemblage of Eastern Europe 东欧二叠纪巽他四足动物群中的Dvinosaurus属（Temnospondyli，Dvinosauria）古老物种

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2024-04-16 DOI: 10.1134/s0031030123600336

A. V. Uliakhin, V. K. Golubev

{"title":"Ancient Species of the Genus Dvinosaurus (Temnospondyli, Dvinosauria) from the Permian Sundyr Tetrapod Assemblage of Eastern Europe","authors":"A. V. Uliakhin, V. K. Golubev","doi":"10.1134/s0031030123600336","DOIUrl":"https://doi.org/10.1134/s0031030123600336","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The oldest species of the genus <i>Dvinosaurus</i> Amalitzky, 1921—<i>Dvinosaurus gubini</i> sp. nov.—is described from the Sundyr-1 reference locality of the Sundyr faunal assemblage of Eastern Europe (Upper Permian, Upper Severodvinian, <i>Suchonica vladimiri</i> Assemblage Zone) based on abundant bone material. The diagnostic criteria for the new species are its smaller size compared to other dvinosaurs, the narrowest skull, a short and wide zygomatic bone, and the parasphenoid body with a wider base of the cultriform process, which is well ossified with the basisphenoid; a strongly curved dentary with a well-defined symphysial crest extending downward from the labial side of the symphysial surface and, in some cases, with a single symphysial tusk, a large angle (135°–152°) between the clavicular plate and dorsal process of the clavicle, narrow areas of the interclavicle for insertion of the clavicles, and a narrow entepicondylus of the humerus. The small size, narrow skull, single symphysial tusk, and hypocentrum morphology make the new form similar to the basal Dvinosauria, in particular, to ancestral Trimerorhachidae.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"38 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140611428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Jurassic Bryozoans of the Family Eleidae (Melicerititida, Stenolaemata) 侏罗纪象科（Meliceritida, Stenolaemata）的岩毛目动物

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2024-04-16 DOI: 10.1134/s0031030123600269

L. A. Viskova

引用次数: 0

Long Bone Morphology and Histology of the Stem Salamander Kulgeriherpeton ultimum (Caudata, Karauridae) from the Lower Cretaceous of Yakutia 雅库特下白垩统茎螈 Kulgeriherpeton ultimum（穴居动物，螈科）的长骨形态学和组织学

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2024-04-16 DOI: 10.1134/s0031030124010076

P. P. Skutschas, P. G. Saburov, A. V. Uliakhin, V. V. Kolchanov

{"title":"Long Bone Morphology and Histology of the Stem Salamander Kulgeriherpeton ultimum (Caudata, Karauridae) from the Lower Cretaceous of Yakutia","authors":"P. P. Skutschas, P. G. Saburov, A. V. Uliakhin, V. V. Kolchanov","doi":"10.1134/s0031030124010076","DOIUrl":"https://doi.org/10.1134/s0031030124010076","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The morphology and histological structure of the humerus and femora of the stem karaurid salamander <i>Kulgeriherpeton ultimum</i> Skutschas et al., 2018, from the Lower Cretaceous Teete locality, Republic of Sakha (Yakutia) is described. The microanatomical and histological structure of <i>K. ultimum</i> is characterized by the presence of a thick compact primary cortex formed by a parallel-fibered bone; the absence (in the humerus) or presence of a small medullary cavity in the mid-diaphysis; the presence of a medullary cavity expanding towards the epiphyses, which continues in the proximal and distal parts as a complex network of branching canals, partially replaced by erosion bays; the presence of primary vascular canals and growth marks in the primary cortex; the presence of remnants of unresorbed cartilage and the Kashchenko’s line; active secondary remodeling with the formation of erosion bays similar to those in large-sized salamanders (other stem karaurid salamanders and cryptobranchids). Skeletochronological analysis of the humerus of <i>K. ultimum</i> showed that, at the time of the animal’s death, its individual age was 13–16 years, and the absence of a reduction in the distance between cyclic growth marks in the peripheral part of the cortex indicates that it belonged to an actively growing individual that had not reached its maximum possible size. The similarity in the morphology of the humerus and femur of <i>K. ultimum</i> and extant aquatic neotenic salamanders (absence of a dorsal crest on the humerus for the attachment of m. subcoracoscapularis, lower, forward-displaced trochanter of the femur, and shallow ventral fossa (fossa trochanterica) on the femur), as well as the presence of remnants of cartilage and preservation of Kashchenko’s line in the internal structure of limb bones, confirm conclusions about aquatic life style and neotenic nature of stem karaurid salamanders.</p>","PeriodicalId":19816,"journal":{"name":"Paleontological Journal","volume":"41 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140882785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ornithosuchidae—Early Archosaurs with a Hyperspecialized Jaw Apparatus 鸟喙龙--具有超特化下颌装置的早期古龙

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2024-04-16 DOI: 10.1134/s0031030124010064

A. G. Sennikov

引用次数: 0

First Specimens of the Cornutan Stylophoran Phyllocystis (Echinodermata) in the Ordovician (Volkhov Regional Stage, Dapingian and Darriwilian) of Baltica and Special Aspects of Stylophoran Axial Symmetry 波罗的海奥陶纪（沃尔霍夫地区阶段、达平纪和达里维利纪）粟米瓣柱孢藻（棘皮动物门）的首个标本以及柱孢藻轴对称的特殊方面

IF 0.6 4区地球科学

Paleontological Journal Pub Date : 2024-04-16 DOI: 10.1134/s0031030123600300

S. V. Rozhnov, G. A. Anekeeva

引用次数: 0

A New Spheromorphic Problematic of the Genus Gaparella from the Lower Cambrian of Western Mongolia 蒙古西部下寒武统 Gaparella 属的一种新的非球形态问题动物