The test architecture of Clypeaster (Echinoidea, Clypeasteroida) and its phylogenetic significance

Mihaljevic, Morana, Jerjen, Iwan and Smith, Andrew B. (2011) The test architecture of Clypeaster (Echinoidea, Clypeasteroida) and its phylogenetic significance. Zootaxa, 2983: 21-38.

Author Mihaljevic, Morana
Jerjen, Iwan
Smith, Andrew B.
Title The test architecture of Clypeaster (Echinoidea, Clypeasteroida) and its phylogenetic significance
Formatted title
The test architecture of Clypeaster (Echinoidea, Clypeasteroida) and its phylogenetic significance
Journal name Zootaxa   Check publisher's open access policy
ISSN 1175-5326
1175-5334
Publication date 2011-08-03
Sub-type Article (original research)
Open Access Status Not yet assessed
Issue 2983
Start page 21
End page 38
Total pages 18
Place of publication Auckland, New Zealand
Publisher Magnolia Press
Language eng
Formatted abstract
Clypeaster is a speciose echinoid genus with almost 50 extant and approximately 350 extinct species, encompassing a great heterogeneity of form. While some attempts to subdivide this genus have been made, none has gained widespread support, and all recent taxonomic treatments have left the genus intact. Here we report new data on internal buttress arrangement, determined from X-Ray tomography, and plate architecture, and use this to establish relationships amongst 19 extant species encompassing 8 of the 10 nominal subgenera that have been proposed. A cladistic analysis of these characters allows us to test the validity of previously suggested subgenera of Clypeaster. Our analysis confirms that Clypeaster is monophyletic with the clypeasteroid family Arachnoididae (as represented by Arachnoides and Ammotrophus) as its immediate sister-group. It also identifies Orthanthus as the most primitive subgenus in the family Clypeaster. However, none of the previously proposed subdivisions of Clypeaster were recovered as clades and test architecture proves too homoplasous to allow a confident basis on which to subdivide the genus.
Keyword Echinoidea
Clypeaster
Test structure
Buttressing
Phylogeny
Echinodermata
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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