A new small-sized penguin from the late Eocene of Seymour Island with additional material of Mesetaornis polaris

IF 1.2 4区地球科学 Q2 GEOLOGY

Gff Pub Date : 2021-07-03 DOI:10.1080/11035897.2021.1900385

P. Jadwiszczak, M. Reguero, T. Mörs

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引用次数: 3

Abstract

ABSTRACT Here, we report on two tarsometatarsi assignable to relatively small-sized Eocene Antarctic penguins, housed in the palaeozoological collections of Naturhistoriska riksmuseet, Stockholm. The Priabonian fossils were collected by museum staff during two joined Argentinean and Swedish expeditions from the Submeseta Formation on Seymour Island, Antarctic Peninsula. One specimen represents a new early sphenisciform, Marambiornopsis sobrali gen. et sp. nov., the sixth small-sized tarsometatarsus-based penguin species known from the Antarctic Eocene. Micro-CT scanning revealed the presence of quite large and essentially empty metatarsal medullary cavities. The second fossil can unequivocally be assigned to Mesetaornis polaris. The specimen represents only the second record of this species and supposedly a relatively young bird. Micro-CT scanning showed that in M. polaris the metatarsal medullary cavities are less developed than in M. sobrali – the cortical and trabecular bone tissues left rather little room for significant hollow spaces. Both specimens also differ in overall density of their trabecular networks.Genus name: LSIDurn:lsid:zoobank.org:act:604F02AA-DD0C-4789-B4D6-85EA68A39A68 Species name: LSIDurn:lsid:zoobank.org:act:477F0FC5-D07B-4A92-97FD-3C4805BAF503

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西摩岛始新世晚期新发现的一种小型企鹅，并附有北极星中涛企鹅的化石

在此，我们报告了两个相对较小的始新世南极企鹅的tarsometatarsi，它们位于斯德哥尔摩国立瑞典自然历史博物馆的古动物收藏中。博物馆工作人员在南极半岛西摩岛的Submeseta组进行了两次阿根廷和瑞典的联合探险，收集了普利亚伯尼亚化石。其中一个标本代表了一种新的早期蝶形，Marambiornopsis sobrali gen. et sp. nov.，这是南极始新世已知的第六种小型跗跖骨企鹅。显微ct扫描显示有相当大且基本空的跖骨髓腔。第二块化石可以明确地归为北极星中天龙。该标本只代表了该物种的第二个记录，据说是一只相对年轻的鸟。Micro-CT扫描显示，北极星的跖骨髓腔发育较弱，皮质和骨小梁组织留下的空间很少，没有明显的空心空间。两种标本在小梁网的总体密度上也有所不同。属名:LSIDurn:lsid:zoobank.org:act:604F02AA-DD0C-4789-B4D6-85EA68A39A68种名:LSIDurn:lsid:zoobank.org:act:477F0FC5-D07B-4A92-97FD-3C4805BAF503

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来源期刊

Gff 地学-地质学

CiteScore

2.80

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： GFF is the journal of the Geological Society of Sweden. It is an international scientific journal that publishes papers in English covering the whole field of geology and palaeontology, i.e. petrology, mineralogy, stratigraphy, systematic palaeontology, palaeogeography, historical geology and Quaternary geology. Systematic descriptions of fossils, minerals and rocks are an important part of GFF''s publishing record. Papers on regional or local geology should deal with Balto-Scandian or Northern European geology, or with geologically related areas. Papers on geophysics, geochemistry, biogeochemistry, climatology and hydrology should have a geological context. Descriptions of new methods (analytical, instrumental or numerical), should be relevant to the broad scope of the journal. Review articles are welcome, and may be solicited occasionally. Thematic issues are also possible.