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Early Cambrian fuxianhuiids from China reveal origin of the gnathobasic protopodite in euarthropods
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Early Cambrian fuxianhuiids from China reveal origin of the gnathobasic protopodite in euarthropods
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Early Cambrian fuxianhuiids from China reveal origin of the gnathobasic protopodite in euarthropods
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Journal Article
Early Cambrian fuxianhuiids from China reveal origin of the gnathobasic protopodite in euarthropods
2018
Overview
Euarthropods owe their evolutionary and ecological success to the morphological plasticity of their appendages. Although this variability is partly expressed in the specialization of the protopodite for a feeding function in the post-deutocerebral limbs, the origin of the former structure among Cambrian representatives remains uncertain. Here, we describe
Alacaris mirabilis
gen. et sp. nov. from the early Cambrian Xiaoshiba Lagerstätte in China, which reveals the proximal organization of fuxianhuiid appendages in exceptional detail. Proximally, the post-deutocerebral limbs possess an antero-posteriorly compressed protopodite with robust spines. The protopodite is attached to an endopod with more than a dozen podomeres, and an oval flap-shaped exopod. The gnathal edges of the protopodites form an axial food groove along the ventral side of the body, indicating a predatory/scavenging autecology. A cladistic analysis indicates that the fuxianhuiid protopodite represents the phylogenetically earliest occurrence of substantial proximal differentiation within stem-group Euarthropoda illuminating the origin of gnathobasic feeding.
The fuxianhuiids were a group of primitive true arthropods living in the Cambrian period. Here, Yang and colleagues describe a new species of fuxianhuiid,
Alacaris mirabilis
, from exceptionally-preserved specimens that illustrate the early evolution of specialized arthropod mouthparts.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
