The nature of non-appendicular anterior paired projections in Palaeozoic total-group Euarthropoda

Arthropod Structure & Development
Javier Ortega-Hernández, Graham E Budd

Abstract

Recent studies have clarified the segmental organization of appendicular and exoskeletal structures in the anterior region of Cambrian stem-group Euarthropoda, and thus led to better understanding of the deep evolutionary origins of the head region in this successful animal group. However, there are aspects of the anterior organization of Palaeozoic euarthropods that remain problematic, such as the morphological identity and significance of minute limb-like projections on the anterior region in stem and crown-group representatives. Here, we draw attention to topological and morphological similarities between the frontal filaments of extant Crustacea and the embryonic frontal processes of Onychophora, and distinctive anterior paired projections observed in several extinct total-group Euarthropoda. Anterior paired projections are redescribed in temporally and phylogenetically distant fossil taxa, including the gilled lobopodians Kerygmachela kierkegaardi and Pambdelurion whittingtoni, the bivalved stem-euarthropod Canadaspis perfecta, the larval pycnogonid Cambropycnogon klausmuelleri, and the mandibulate Tanazios dokeron. Developmental data supporting the homology of the 'primary antennae' of Onychophora, the 'frontal appendages...Continue Reading

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Citations

Dec 19, 2016·Arthropod Structure & Development·Javier Ortega-HernándezGraham E Budd
Oct 5, 2018·PLoS Genetics·Takahiro OhdeTeruyuki Niimi
Aug 16, 2018·Royal Society Open Science·Jean VannierJean-Bernard Caron
Sep 29, 2017·Integrative and Comparative Biology·Elizabeth L Jockusch
Jan 10, 2020·BMC Evolutionary Biology·Cédric AriaMaoyan Zhu
Jun 11, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Christine MartinGeorg Mayer
Apr 17, 2021·Arthropod Structure & Development·Graham E Budd

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