Data from: Characterization of the placoderm (Gnathostomata) assemblage from the tetrapod-bearing locality of Strud (Belgium, Upper Famennian)

The placoderm fauna of the late Famennian tetrapod-bearing locality of Strud, Belgium, is studied on the basis of historical and newly collected material. It includes the previously described antiarch Grossilepis rikiki, the groenlandaspidid Turrisaspis strudensis sp. nov. and the actinolepidoideid Phyllolepis undulata. P. undulata is thoroughly described and joins the list of the valid Phyllolepis species confidently diagnosed. A morphometrical analysis performed on the centronuchal and anterior ventrolateral plates of the Phyllolepis material demonstrates that there is only one species of Phyllolepis in Belgium (thus, Phyllolepis konincki becomes a junior synonym of P. undulata), that P. rossimontina (Pennsylvania) is a synonym of P. undulata and that the unity of the genus Phyllolepis is strongly supported, although the characterization of several species within this genus is blurred. The strong resemblance between the faunal compositions in Strud and Red Hill (Pennsylvania, USA) suggests important faunal exchanges between these regions of the Euramerica landmass.

本研究基于历史馆藏与新采集的标本，对比利时斯特鲁德（Strud）法门期末期（late Famennian）产四足类（tetrapod）化石点的盾皮鱼（placoderm）动物群展开研究。该动物群包含此前已报道的反弓类（antiarch）格氏巨鳞鱼（Grossilepis rikiki）、格陵兰盾皮鱼科（groenlandaspidid）新种斯特鲁德塔盾鱼（Turrisaspis strudensis sp. nov.），以及褶齿鱼亚目类群（actinolepidoideid）的波纹叶鳞鱼（Phyllolepis undulata）。本研究对波纹叶鳞鱼进行了详尽的形态学描述，并将其纳入经可靠鉴定的有效叶鳞鱼属（Phyllolepis）物种名录。基于叶鳞鱼属标本的颈中板（centronuchal plate）与前腹侧板（anterior ventrolateral plate）开展的形态测量分析（morphometrical analysis）显示：比利时地区仅存在一种叶鳞鱼属物种，因此康氏叶鳞鱼（Phyllolepis konincki）被确立为波纹叶鳞鱼的次同物异名；美国宾夕法尼亚州的罗斯蒙特叶鳞鱼（P. rossimontina）亦为波纹叶鳞鱼的同物异名；尽管叶鳞鱼属内多数物种的分类界定仍较为模糊，但该属的单系性得到了强力支持。斯特鲁德化石点与美国宾夕法尼亚州雷德希尔（Red Hill）的动物群组成高度相似，这表明二者所在的欧美大陆块（Euramerica landmass）区域曾存在广泛的动物群交流。