The Late Permian araxoceratid ammonoids: a case of repetitive temporal and spatial unfolding of homoplastic conch characters
The Late Permian araxoceratid ammonoids: a case of repetitive temporal and spatial unfolding of homoplastic conch characters
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晚二叠世araxoceratid菊石：同质海螺特征的时空重复展开案例
DOI：
10.1127/njgpa/2019/0826
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发表时间：
2019-06
期刊：
影响因子：
--
通讯作者：
Abbas Ghaderi
中科院分区：
文献类型：
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作者：
Dieter Korn;Abbas Ghaderi
武家坪期（晚二叠世早期）氨类araxoceratiae科在Araxoceras（武家坪期早期，外高加索-伊朗）、Vedioceras（武家坪期晚期，外高加索-伊朗）和Konglingites + Kiangsiceras（武家坪期晚期，中国南方）三个属中呈现出重复的形态谱。这三种海螺的形态各异，从磨石形到卷轴形；它们还反复显示出三羧酸酯腔的形成。如果将缝合线作为本群系统发育关系的主要特征，那么这些海螺特征在时间和空间上是反复形成的，必然具有同质性。本文报道了伊朗西北部吴家坪期沉积岩中3个新种：Araxoceras truncatum n. sp.和Araxoceras insolens n. sp.（均为吴家坪期早期）和Vedioceras fusiforme n. sp.（吴家坪期晚期）。这些新分类群扩大了外高加索-伊朗西北地区晚二叠世菊石的分类多样性，特别是形态差异。
The Wuchiapingian (early Late Permian) ammonoid family Araxoceratidae shows a morphological spectrum that is recurring in the three genera Araxoceras (early Wuchiapingian; Transcaucasus-Iran), Vedioceras (late Wuchiapingian; Transcaucasus-Iran) and Konglingites plus Kiangsiceras (late Wuchiapingian; South China). All three display a range of conch morphology from millstone-shaped to reel-shaped; they also repeatedly show the formation of a tricarinate venter. When the suture line is regarded as the main character for phylogenetic relationships in this group, these conch characters must be seen homoplastic because they iteratively formed in time and space. From the Wuchiapingian sedimentary rocks of NW Iran, three new species of araxoceratid ammonoids are described herein: Araxoceras truncatum n. sp. and Araxoceras insolens n. sp.(both early Wuchiapingian) as well as Vedioceras fusiforme n. sp.(late Wuchiapingian). With these new taxa, the taxonomic diversity and particularly the morphological disparity of the Late Permian ammonoids from the Transcaucasus-NW Iran region is extended.