德克萨斯州中新世河狸类(啮齿目,海狸科)及美国德克萨斯州海岸平原中新世河狸的研究进展

IF 2 4区 地球科学 Q1 Earth and Planetary Sciences
S. May, Matthew Brown
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引用次数: 0

摘要

在德克萨斯海岸平原中新世地层中发现的海狸化石很少。第一次发现海狸化石是在阿里卡利时代的动物群中。在德克萨斯州纳瓦索塔附近的一个海明福特动物群中报告了一个海狸化石标本。本文描述了来自多个早期巴斯托动物群的单爪类和近齐兽类,包括一个新的分类群——近齐兽类。该分类群a . buceei是一种相对较大的海狸,大小与a . fluuminis相似,并且与a . fluuminis和a . nanus具有相同的特征。隐头畸形全型为部分颅骨和内嵌,保留了眶孔和腭的主要特征。参考标本包括部分牙齿,分离的颊齿和两个颅后元素。在Barstovian早期动物群中,该分类群与一种被鉴定为Monosaulax sp.的小海狸的共存与德克萨斯州沿海平原上长鼻目动物的首次出现是同时发生的。在Barstovian晚期和Clarendonian晚期的动物群中,海狸是未知的,尽管啮齿类动物的化石通常在这些动物群中并不常见。大多数海狸化石标本是在20世纪初由德克萨斯州农工大学的马克·弗朗西斯博士或德克萨斯州全州古生物矿物学调查的收藏家获得的,并在德克萨斯州脊椎动物古生物收藏馆展出。保存在该设施的档案材料对揭示收集的历史、地点的分布以及对德克萨斯海岸平原中新世脊椎动物生物地层学的不断发展的理解起到了重要作用。史蒂文·r·梅,德克萨斯大学奥斯汀分校杰克逊学校地球历史博物馆,美国德克萨斯州奥斯汀78758。srmay@utexas.edu马修·a·布朗,杰克逊学校地球历史博物馆,德克萨斯大学奥斯汀分校,奥斯汀,德克萨斯州78758,美国。matthewbrown@utexas.edu
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anchitheriomys buceei (Rodentia, Castoridae) from the Miocene of Texas and a review of the Miocene beavers from the Texas Coastal Plain, USA
The record of fossil beavers from Miocene age strata in the Texas Coastal Plain is sparse. The first occurrence of fossil beavers is in Arikareean age faunas. One fossil beaver specimen was reported from a Hemingfordian fauna near Navasota, TX. Both Monosaulax and Anchitheriomys are described here from multiple early Barstovian faunas including a new taxon, Anchitheriomys buceei. The taxon, A. buceei, was a relatively large beaver, similar to A. fluminis in size, and shares characters with both A. fluminis and A. nanus. The holotype of Anchitheriomys buceei is a partial skull and endocast that preserves key features of the orbital foramina and palatine. Referred specimens include a partial dentary, isolated cheek teeth, and two post-cranial elements. The co-occurrence of this taxon and a small beaver identified as Monosaulax sp. in early Barstovian faunas is coeval with the first occurrence of proboscideans along the Texas Coastal Plain. Beavers are unknown in late Barstovian and Clarendonian faunas, although rodent fossils are uncommon from these faunas in general. Most of the fossil beaver specimens were obtained in the early twentieth century by collectors affiliated with Dr. Mark Francis at Texas A&M University, or with the State-Wide Paleontologic-Mineralogic Survey in Texas and are curated at the Texas Vertebrate Paleontology Collections. Archival materials housed at that facility have been instrumental in unraveling the history of collection, the distribution of localities and the evolving understanding of Miocene vertebrate biostratigraphy on the Texas Coastal Plain. Steven R. May, Jackson School Museum of Earth History, The University of Texas at Austin, Austin, Texas 78758, USA. srmay@utexas.edu Matthew A. Brown, Jackson School Museum of Earth History, The University of Texas at Austin, Austin, Texas 78758, USA. matthewbrown@utexas.edu
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来源期刊
Palaeontologia Electronica
Palaeontologia Electronica 地学-古生物学
CiteScore
3.60
自引率
0.00%
发文量
20
审稿时长
>12 weeks
期刊介绍: Founded in 1997, Palaeontologia Electronica (PE) is the longest running open-access, peer-reviewed electronic journal and covers all aspects of palaeontology. PE uses an external double-blind peer review system for all manuscripts. Copyright of scientific papers is held by one of the three sponsoring professional societies at the author''s choice. Reviews, commentaries, and other material is placed in the public domain. PE papers comply with regulations for taxonomic nomenclature established in the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants.
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