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Sanctacaris, member of the family Sanctacarididae from the Burgess Shale of Canada, represents the oldest occurrence of a confirmed chelicerate, Middle Cambrian in age. [50] Although its chelicerate nature has been doubted for its pattern of tagmosis (how the segments are grouped, especially in the head), [ 49 ] a restudy in 2014 confirmed its ...
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Its chelicerate affinities regain support in later observations, [2] [3] alongside the reassignment of Habelia optata as a sanctacaridid-related basal chelicerate. [3] It has been placed as a member of the extinct family Sanctacarididae alongside Wisangocaris and Utahcaris. [3] Sanctacaris specimens range from 46 to 93 mm in length. [4]
This page was last edited on 6 December 2016, at 07:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Analyses of the data using sets of genes with different evolutionary rates produced mutually incompatible phylogenetic trees. The authors favoured relationships shown by more slowly evolving genes, which demonstrated the monophyly of Chelicerata, Euchelicerata and Arachnida, as well as of some clades within the arachnids.
The genus is characterized by a capsule-like dorsal exoskeleton (), which was divided into a subequal size of cephalon and pygidium with 7 thoracic segments in between. . Below the cephalon was a pair of huge compound eyes, followed by a series of walking legs and gnathobasic (jaw-like) limbs, each have 3 pairs in
This page was last edited on 21 February 2018, at 07:04 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply.
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