Garvie Christopher L, Goedert James L, Janssen Arie W
Non-Vertebrate Paleontology Lab, University of Texas-Jackson School of Geosciences, Bldg PRC122, 10100 Burnett Road, Austin, Texas 78758, U.S.A..
Zootaxa. 2020 May 27;4782(1):zootaxa.4782.1.1. doi: 10.11646/zootaxa.4782.1.1.
A comprehensive discussion and survey is made of all North American Paleogene and Late Cretaceous pteropods, and their systematics reviewed. From the West Coast of North America pteropod fossils have been collected from 23 localities in Washington State, and from the Gulf Coastal Plain they have been found in 40 localities. We also review earlier published specimens from boreholes in the Atlantic Coastal Plain. As a result, six new species are introduced from the Gulf Coast (Currylimacina asperita Garvie sp. nov., Heliconoides hodgkinsoni Garvie sp. nov., Limacina texanopsis Garvie sp. nov., Limacina parvabrazensis Garvie Janssen sp. nov., Limacina pseudopygmaea Garvie Janssen sp. nov., Cheilospicata cedrus Garvie sp. nov.) and one from Washington State (Clio gailae Goedert Janssen sp. nov.). The geographical distribution and/or stratigraphic ranges of several species has been extended, for example, Limacina canadaensis Hodgkinson, 1992, is reported for the first time from western North America. Some species originally described from elsewhere, Altaspiratella multispira (Curry, 1982), Heliconoides bartonensis (Curry, 1965), L. karasawai Ando, 2011, L. aff. valvatina (Reuss, 1867), Creseis spina (Reuss, 1867) and Clio chadumica Korobkov, 1966, are reported for the first time from the Americas. New specimens of several poorly known species yielded additional information on morphology or biostratigraphy. It is shown that some species have longer temporal ranges in America, occurring in, or continuing into younger deposits than those in Europe. In addition to the only Cretaceous pteropod from Washington State known so far, several enigmatic species possibly representing Pteropoda are described from the Late Cretaceous (Maastrichtian) and Danian of Texas, which allows a salient discussion on the early history of Pteropoda. An enigmatic specimen from the Eocene of Texas might represent a very early form of Gymnosomata. This analysis shows that there may be more pteropod species represented during the Late Cretaceous and Paleocene than previously suspected.
对所有北美古近纪和晚白垩世翼足类动物进行了全面的讨论和调查，并对其分类学进行了综述。在北美洲西海岸，从华盛顿州的23个地点采集到了翼足类化石；在墨西哥湾沿岸平原，在40个地点发现了翼足类化石。我们还对先前发表的来自大西洋沿岸平原钻孔的标本进行了综述。结果，从墨西哥湾沿岸引入了6个新物种（糙面弯锦海蛳螺Currylimacina asperita Garvie新种、霍氏螺旋海蝶螺Heliconoides hodgkinsoni Garvie新种、德州拟海若螺Limacina texanopsis Garvie新种、小巴拉那海若螺Limacina parvabrazensis Garvie Janssen新种、假矮小海若螺Limacina pseudopygmaea Garvie Janssen新种、雪松唇饰海蝶螺Cheilospicata cedrus Garvie新种），从华盛顿州引入了1个新物种（盖氏克利俄螺Clio gailae Goedert Janssen新种）。几个物种的地理分布和/或地层范围得到了扩展，例如，1992年的加拿大海若螺Limacina canadaensis Hodgkinson首次在北美洲西部被报道。一些最初在其他地方描述的物种，多旋高旋海蛳螺Altaspiratella multispira（Curry，1982）、巴顿螺旋海蝶螺Heliconoides bartonensis（Curry，1965）、柄泽海若螺L. karasawai Ando，2011、近圆海若螺L. aff. valvatina（Reuss，1867）、刺状弯锦海蛳螺Creseis spina（Reuss，1867）和查杜米克利俄螺Clio chadumica Korobkov，1966，首次在美洲被报道。几个鲜为人知的物种的新标本提供了关于形态学或生物地层学的更多信息。结果表明，一些物种在美洲的存在时间范围更长，出现在比欧洲更年轻的沉积物中，或延续到更年轻的沉积物中。除了目前已知的华盛顿州唯一的白垩纪翼足类动物外，还从得克萨斯州的晚白垩世（马斯特里赫特阶）和达宁阶描述了几个可能代表翼足目的神秘物种，这使得关于翼足目早期历史的讨论更加突出。一个来自得克萨斯州始新世的神秘标本可能代表裸鳃亚目的一种非常早期的形态。该分析表明，晚白垩世和古新世的翼足类物种可能比以前怀疑的更多。
