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Alacaris

Extinct genus of arthropods From Wikipedia, the free encyclopedia

Alacaris
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Alacaris is an extinct genus of fuxianhuiid arthropod known from the Cambrian period. It is only known from the type species Alacaris mirabilis (mistakenly named Alacaris multinoda in a figure in the describing paper) from the Cambrian Stage 3 aged Xiaoshiba Lagerstätte in Yunnan Province, China. It is morphologically similar to Chengjiangocaris, with which it forms a clade within Fuxianhuiida. Individuals reach a maximum of 12 centimetres in length, with a trunk consisting of 13 tergites. The basal region of the post-deutocerebral limbs were used in feeding, with the rhythmic movement of the legs guiding food towards the mouth along the food groove between the limbs, with gnathobases present near the mouth to macerate food.[1]

Quick Facts Scientific classification, Type species ...
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Reconstruction of Alacaris, with Chengjiangocaris lower right
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Various specimens of Alacaris
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Phylogeny

Fuxianhuiida

Shankouia

Liangwangshania

Chengjiangocarididae

Alacaris

Chengjiangocaris

Fuxianhuiidae

References

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