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首页> 外文期刊>Journal of Systematic Palaeontology >New specimens of horned dinosaurs from the Aguja Formation of West Texas, and a revision of Agujaceratops
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New specimens of horned dinosaurs from the Aguja Formation of West Texas, and a revision of Agujaceratops

机译：来自西德克萨斯州阿古贾组的有角恐龙的新标本，以及对古阿古角龙的修订

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Most homed dinosaur remains recovered from the Aguja Formation in West Texas are referable to the endemic chasmosaurine Agujaceratops mariscalensis. One specimen, however, differs sufficiently to justify its designation as the holotype of a new species, Agujaceratops mavericus sp. nov. This specimen and an isolated postorbital horncore from the same vicinity are stratigraphically the highest found in the Aguja Formation. A well-preserved juvenile specimen exhibits some unique features, and others compatible with A. mavericus, but due to its immature condition cannot be identified with certainty. A parietal referred to A. mariscalensis is the most complete thus far known, and shows that the frill of this taxon is more elaborately ornamented than previously believed, bearing a set of large hom-like spikes at the posterolateral comers. These two species share features of the premaxilla and squamosal, which warrant their inclusion in the same genus. However, characters thought to distinguish the two species vary in a manner similar to that found in other chasmosaurines, where debate persists as to their taxonomic significance. A consensus species concept has yet to be adopted for ceratopsid genera, of which most are monotypic. As a result, the two Agujaceratops species could be interpreted as arbitrary anagenetic stages in a single lineage, end-members in a spectrum of ontogenetic and sex-associated variation in that lineage, or two sympatric lineages that occupied separate niches in the same range.
机译：从西得克萨斯州的阿古贾组中发现的大多数驯化的恐龙遗骸都与特有的长鳞龙马龙古猿Agujaceratops mariscalensis有关。但是，一个标本差异很大，足以证明其被指定为新物种的全称，即Agujaceratops mavericus sp。十一月从地层上看，该标本和一个孤立的眶后角核在阿古贾组中是最高的。保存完好的少年标本具有一些独特的特征，其他特征与小曲霉兼容，但由于其未成熟状况，无法确定。迄今为止，已知的一种称为mariscalensis的顶叶是最完整的，并且表明该分类单元的褶皱比以前认为的更为精美，在后外侧拐角处带有一组大的类似的尖刺。这两个物种具有上颌前突和鳞状鳞茎的特征，这保证了它们包含在同一属中。但是，被认为可以区分这两个物种的字符以与其他长吻龙相似的方式变化，在其他长尾龙中，关于它们的分类学意义仍然存在争议。 ceratopsid属尚未采用共有物种的概念，其中大多数是单型的。结果，这两个刺龙属物种可以解释为单一血统的任意肛门相阶段，该血统中一系列个体遗传和性别相关变异的末端成员，或两个占据同一范围内独立壁ni的同胞血统。

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