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Echinoidea source details

Barras, C. G. (2007). Phylogeny of the Jurassic to Early Cretaceous ‘Disasteroid' Echinoids (Echinoidea; Echinodermata) and the origins of Spatangoids and Holasteroids. Journal of Systematic Palaeontology. 5(2): 133-161.
155264
10.1017/s147720190600201x [view]
Barras, C. G.
2007
Phylogeny of the Jurassic to Early Cretaceous ‘Disasteroid' Echinoids (Echinoidea; Echinodermata) and the origins of Spatangoids and Holasteroids
Journal of Systematic Palaeontology
5(2): 133-161
Publication
The ‘disasteroids’ are a morphologically unusual group of echinoids characterised by having a disjunct, or divided, apical disc. The group is now recognised as being basal to the two extant orders of irregular echinoid, the Holasteroida and Spatangoida. There are a number of theories that detail the pathway leading from the ‘disasteroids’ to the holasteroids and spatangoids, but all lack a rigorous phylogenetic hypothesis. Following a re-examination of ‘disasteroid’ material, the number of valid ‘disasteroid’ genera is here reduced to 16, including the new genus Smithiaster. New plating diagrams of the majority of these taxa are presented and form the basis of an analysis of ‘disasteroid’ phylogenetic relationships. The new analysis provides a phylogenetic hypothesis linking the ‘disasteroids’ to the basal Atelostomata (Hyboclypus and Aulacopygus) and also to the Holasteroida and Spatangoida. The phylogeny also confirms that the problematic genera Desorella, Infraclypeus and Menopygus, together with the ‘disasteroid’ Grasia, form a monophyletic group the Desorellidae, in the stem group Atelostomata.
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2013-01-12 18:30:12Z
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2014-03-21 09:39:14Z
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Grasia Michelin, 1854 † (additional source)
 Status

This monophyletic group of Jurassic early irregular echinoids is called Infraclypeidae by Saucède et al (2007), ... [details]

 Status

As defined by Mintz (1968: p. 1287), the order Disasteroida would include the genera Disaster L. Agassiz, 1836 and ... [details]

 Status

Originally Mintz (1968: p. 1286) included the following taxa: Galeropygus Cotteau, 1856, Hyboclypus L. Agassiz, ... [details]

 Status

This monophyletic group of Jurassic early irregular echinoids is called Infraclypeidae by Saucède et al (2007), ... [details]

 Status

The family Menopygidae as treated by Lambert & Thiéry (1911: p. 326-327) included Desorella and Infraclypeus ... [details]


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