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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Conch geometry and ontogenetic trajectories in the triangularly coiled Late Devonian ammonoid Wocklumeria and related genera
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Conch geometry and ontogenetic trajectories in the triangularly coiled Late Devonian ammonoid Wocklumeria and related genera

机译：三角形盘绕的晚泥盆纪铵类Wocklumeria和相关属的海螺几何和个体发育轨迹

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摘要

The species of the genera Wocklumeria and Parawocklumeria are investigated in terms of their conch geometry, intraspecific variability, and ontogenctic trajectories using a rich material. Both genera are closely related, as indicated by a number of characters regarding conch geometry, ornament, and suture line. Some of the peculiar conch characters, including adult modifications, such as opening of the umbilicus, a terminal constriction, lateral narrowing of the mature aperture, and extreme septal crowding that is paralleled by the loss of suture characters can be seen in Wocklumeria. Wocklumeria sphaeroides (RICHTER, 1848) and Wocklumeria denckmanni (WEDEKIND, 1918) are distinguished on the base of degree of triangular coiling in intermediate whorls. Wocklumeria oblivia n. sp. and Wocklumeria boulmanensis n. sp. are newly described from the Anti-Atlas of Morocco.
机译：Wocklumeria和Parawocklumeria属的物种以其精炼海螺的几何形状，种内变异性和本体轨迹来进行了研究。如海螺的几何形状，装饰和缝合线的许多字符所示，这两个属密切相关。在Wocklumeria中，可以看到一些特殊的海螺特征，包括成年修饰，如脐部张开，末端收缩，成熟孔的横向变窄以及与缝合特征消失平行的极度间隔的拥挤。球形的Wocklumeria sphaeroides（RICHTER，1848）和Wocklumeria的denckmanni（WEDEKIND，1918）是根据中间轮生的三角形盘绕度来区分的。黑腹锦葵sp。和Wullumeria boulmanensis n。 sp。是从《摩洛哥反图集》中新近描述的。

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