A new species of the Rhytidosteidae from the Lystrosaurus zone and a review of the Rhytidosteoidea
A new species of the Rhytidosteidae from the Lystrosaurus zone and a review of the Rhytidosteoidea
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水龙带的Rhytidosteidae一新种及Rhytidosteoidea的回顾
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
J. Zawiskie
中科院分区：
文献类型：
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作者：
J. Cosgriff;J. Zawiskie
本文描述了水龙兽科一新种-它的进化关系和适应形态被认为是。最接近的物种是来自澳大利亚下三叠统的三角龙，其次是来自斯匹次卑尔根下三叠统的盾冠龙，最远的物种是可能也来自水龙带的卡鲁龙。与Rhytidosteidae的其他物种一样，其埋藏学和适应性形态学证据都是可用的，P. potamia显然是一个河流，地下，食鱼的temnospondyl关于其主要和首选的栖息地。从新种提供的信息出发，Rhytidosteoidea的分类结构进行了重组和扩展，并为该总科及其所包含的科提供了新的诊断。现包括三角龙（Deltasaurus kimberleyensis）、三角龙（D. pustulatus、Peltostega erici、P. xmmani、Potamia和Rhytidosteus capensis。一个新的科，Indobrachyopidae，被创建，包括Derwentia warreni（从Rhy Artistidosteidae中删除），Indobrachyops panchetensis，Maurisaurus dentatus，Maurisaurus（Lyrosaurus）australis和Rewana quadricuneata。Laidleria gracilis从Rhytidosteoidea中移除。裂骨龙和哈氏阿马龙具有与超家族成员相同的一些特征，但在大多数特征上过于明显，不能被认为是皱骨龙。利用计算机程序建立了rytidosteids和indobrachyopids之间的分类距离。构建了该总科的系统发育，这与该种的地层和地理分布相一致。南方起源的总科一般向北扩散的建议。
Pneumatostega potamia, a new rhytidosteid temnospondyl from the Lystrosaurus Zone, is de scribed and compared with the other species of the family. Its evolutionary relationships and adaptive morphology are considered. The closest affinity is with the species of Deltasaurus from the Lower Triassic of Australia, the next closest with the species of Peltostega from the Lower Triassic of Spitsbergen and the most distant with Rhytidosteus capensis, a Karoo species which is prob ably also from the Lystrosaurus Zone. As with other species of Rhytidosteidae, for which both taphonomic and adaptive morphologic evidence is available, P. potamia was, apparently, a fluviatile, subsurface, piscivorous temnospondyl regarding its primary and preferred habitat. Proceeding from information contributed by the new species, the taxonomic structure of the Rhytidosteoidea is reorganised and expanded and new diagnoses are provided for both this superfamily and its contained families. The family Rhytidosteidae now includes Deltasaurus kimberleyensis, D. pustulatus, Peltostega erici, P. xmmani, Pneumatostega potamia and Rhytidosteus capensis. A new family, Indobrachyopidae, is created to include Derwentia warreni (removed from the Rhy tidosteidae), Indobrachyops panchetensis, Mahavisaurus dentatus, Mahavisaurus (Lyrosaurus) australis and Rewana quadricuneata. Laidleria gracilis is removed from the Rhytidosteoidea. Latiscopus disjunctus and Almasaurus habbazi possess some features in common with members of the superfam ily but are too distinct in most features to be considered rhytidosteoids. Taxonomic distances among the rhytidosteids and indobrachyopids are established by a com puter program. A phylogeny of the superfamily is constructed and this is consonant with the stratigraphic and geographic occurrences of the species. A southern origin for the superfamily with a generally northward dispersal is proposed.