分类： 生物学 >> 生物进化论 提交时间： 2024-05-31
摘要： Within the dicynodont genus Turfanodon, there are two recognized species, T.bogdaensis and T. jiufengensis. Both species are known by relatively complete cranial materials, but the mandibles and most postcranial bones have been described only for T. jiufengensis. This paper reports new dicynodont specimens from Turpan, Xinjiang, referring them to T. bogdaensis. They can clearly be differentiated from T. jiufengensis by the flatter lateral surface of the snoutregion, a prominent swelling on the lateral dentary shelf, and the rounded femoral head. Thediagnosis of Turfanodon is revised. The combination of a flat circumorbital rim, posterior portionof anterior pterygoid rami with converging ventral ridges, and a possible autapomorphy, a deepnotch on scapula forming procoracoid foramen, are confirmed. It also differentiated from alldicynodonts other than Myosaurus, Kembawacela and Lystrosaurus by having accessory ridgeslateral to the median palatal ridge.
分类： 生物学 >> 生物进化论 提交时间： 2024-03-21
摘要： The affinity of ‘Dongfangaspis qujingensis’, initially assigned to Dongfangaspisbut later to Laxaspis, has long been controversial. However, the taxonomical revision raisesa new problem of junior homonym since the type species of Laxaspis is L. qujingensis. Here,we describe some new materials of ‘Dongfangaspis qujingensis’ and Damaspis vartus fromthe Xishancun Formation (early Lochkovian, Early Devonian) in Qujing, Yunnan Province.‘Dongfangaspis qujingensis’ strikingly resembles Damaspis vartus in the slightly longerheadshield, bifurcated ends of the lateral transverse canals, unconnected V-shaped posteriorsupraorbital canals, and at least seven pairs of lateral transverse canals issuing from the lateraldorsal canal. These similarities indicate that ‘D. qujingensis’ is more suggestive of Damaspis thanDongfangaspis and Laxaspis. Therefore, we propose to remove ‘Dongfangaspis qujingensis’ fromLaxaspis to Damaspis. The new specimens of Damaspis vartus reveal five long lateral transversecanals on the right side, corroborating that the asymmetric sensory canal system in the holotype isthe intraspecific variation.
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