Goolaerts Stijn, Denayer Julien, Mottequin Bernard
OD Earth & History of Life, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000, Brussels, Belgium.
EDDy Lab, Geology UR, University of Liège, Allée du Six-Août B18, Sart Tilman, 4000, Liège, Belgium.
Naturwissenschaften. 2017 Nov 3;104(11-12):98. doi: 10.1007/s00114-017-1522-0.
The taxonomic affinities of fossils from the Frasnian succession of Belgium previously described as phyllopod and phyllocarid crustacean shields are discussed. The rediscovery of the holotype of Ellipsocaris dewalquei, the type species of the genus Ellipsocaris Woodward in Dewalque, 1882, allows to end the discussion on the taxonomic assignation of the genus Ellipsocaris. It is removed from the phyllopod crustaceans as interpreted originally and considered here as an ammonoid anaptychus. Furthermore, it is considered to be a junior synonym of the genus Sidetes Giebel, 1847. Similarly, Van Straelen's (1933) lower to middle Frasnian record Spathiocaris chagrinensis Ruedemann, 1916, is also an ammonoid anaptychus. Although ammonoids can be relatively frequent in some Frasnian horizons of Belgium, anaptychi remain particularly scarce and the attribution to the present material to peculiar ammonoid species is not possible.
本文讨论了比利时弗拉斯阶地层中先前被描述为叶足纲和叶虾亚纲甲壳动物盾板化石的分类亲缘关系。椭圆虾（Ellipsocaris dewalquei）全模标本的重新发现，椭圆虾是伍德沃德（Woodward）于1882年在德瓦尔克（Dewalque）建立的椭圆虾属（Ellipsocaris）的模式种，这使得关于椭圆虾属分类归属的讨论得以结束。它从最初解释的叶足纲甲壳动物中移除，在此被视为菊石的口盖。此外，它被认为是吉贝尔（Giebel）于1847年建立的西得特斯属（Sidetes）的次异名。同样，范·斯特拉伦（Van Straelen，1933）记录的弗拉斯阶下部至中部的沙格林斯帕蒂虾（Spathiocaris chagrinensis），鲁德曼（Ruedemann）于1916年发现，也是菊石的口盖。尽管菊石在比利时的一些弗拉斯阶地层中可能相对常见，但口盖仍然特别稀少，因此无法将当前材料归属于特定的菊石种类。
