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Taxonomic status of some species of Aspidostomatidae (Bryozoa, Cheilostomata) from the Oligocene and Miocene of Patagonia (Argentina)

机译:来自巴塔哥尼亚少妇(阿根廷)的寡替政策和中世纪的某些物种aspidostomatidaida(Bryozoa,Cheilostomata)的分类状态

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摘要

The bryozoan genus Aspidostoma Hincks, 1881 has been regarded as the only representative of the Aspidostomatidae Jullien, 1888 in Argentina to date. Its type species, Aspidostoma giganteum (Busk, 1854), is presently distributed in the Magellanic Region (Argentina and Chile) and has been recorded in Oligocene and Miocene fossil deposits of Santa Cruz and Chubut, respectively. New material from San Julian (late Oligocene), Monte Leon (early Miocene), Chenque (early to middle Miocene), and Puerto Madryn (late Miocene) formations suggests, however, that A. giganteum is not represented in the fossil record. Material from Puerto Madryn Formation previously regarded as A. giganteum is here recognized as Aspidostoma roveretoi new species. Aspidostoma ortmanni Canu, 1904 is revalidated for the species from the San Julian Formation. Aspidostoma armatum new species and Aspidostoma tehuelche new species are introduced for material from the Monte Leon and Chenque formations, respectively. Aspidostoma incrustans Canu, 1908, from the early Miocene, is redescribed. Melychocella Gordon and Taylor, 1999, which differs from Aspidostoma in having vicarious avicularia and lacking a median ridge and a quadrangular process proximal to the opesia-orihce, is so far represented by three Paleogene species from the Chatham Islands (Southwest Pacific). The material from Monte Leon allowed us to transfer Aspidostoma flammulum Canu, 1908 to Melychocella, resulting in the new combination Melychocella flammula (Canu, 1908). Melychocella biperforata new species is described from the lower Miocene Monte Leon and Chenque formations. The presence of Melychocella in the Neogene of Patagonia extends its geographic distribution and its temporal range.
机译:Bryozoan属aspidostoma Hincks,1881年被认为是阿斯塔米斯托米特·朱利恩,1888年的阿根廷迄今为止的唯一代表。其类型的物种,Aspidostoma Giganteum(Busk,1854)目前分布在麦哲伦地区(阿根廷和智利),并分别在寡核苷和胆石沉积物中记录在Santa Cruz和Chubut中。然而,来自三朱利安(晚矿)的新材料,蒙特莱昂(早期的内科),Chenque(早期到中间内肾上腺)和波多黎各(后期的Miocene)的地层表明,A. Giganteum没有在化石记录中代表。来自Puerto Madryn形成以前被视为A. Giganteum的材料在这里被认为是Aspidostoma Roveretoi新物种。 Aspidostoma Ortmanni Canu,1904年,从圣朱利安形成的物种重新验证。 Aspivostoma Armatum新物种和aspidostoma tehuelche新物种分别用于来自蒙特莱昂和Chenque的材料。 aspidostoma contustans canu,1908,来自早期的内科,是重新分辨的。 Meselychocella Gordon和Taylor,1999年,与aspidostoma不同于患有替代性的植物和缺乏蛋白核桃鸟类的中位数和四边形过程,迄今为止由Chatham群岛(西南太平洋)的三种古雄物种代表。来自Monte Leon的材料让我们转移1908年的aspidostoma flammulum canu,1908年到Melychocella,导致新的组合Melychocella蝶(Canu,1908)。 Meselychocella Biperforata新物种是从下部内科蒙特莱昂和Chenque地层中描述的。巴塔哥尼亚州的新生儿的Melychocella的存在延伸其地理分布及其时间范围。

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  • 来源
    《Journal of Paleontology》 |2018年第3期|共10页
  • 作者单位

    Museo La Plata Div Paleozool Invertebrados Paseo Bosque S-N B1900FWA La Plata Buenos Aires Argentina;

    Museo Argentino Ciencias Nat Bernardino Rivadavia Av Angel Gallardo 470 C1405DJR Buenos Aires DF Argentina;

    Museo La Plata Div Paleozool Invertebrados Paseo Bosque S-N B1900FWA La Plata Buenos Aires Argentina;

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  • 中图分类 古生物学;
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