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Echinoidea taxon detailsSierradiadema kristini Mooi & Hilton, 2014 †
 823877 (urn:lsid:marinespecies.org:taxname:823877)
accepted
Species
marine,
fossil only
Mooi, R., Hilton, R. P. (2014). First record and phylogenetic significance of a Jurassic diadematacean sea urchin from California. <em>Journal of Paleontology.</em> 88(3): 421-433., available online at https://doi.org/10.1666/13-130
page(s): 421-423; figs 2.1-2, 3.1-3, 4, 5.1-3 [details] Available for editors 
Holotype CASG 72939
Holotype CASG 72939 [details]
Etymology Named after Kristin Hilton, the discoverer of the fossil echinoid
Etymology Named after Kristin Hilton, the discoverer of the fossil echinoid [details] Stratigraphy Colfax sequence of the Mariposa Formation
Stratigraphy Colfax sequence of the Mariposa Formation [details]
Kroh, A.; Mooi, R. (2024). World Echinoidea Database. Sierradiadema kristini Mooi & Hilton, 2014 †. Accessed at: https://www.marinespecies.org/Echinoidea/aphia.php?p=taxdetails&id=823877 on 2024-05-14
Date action by
original description
Mooi, R., Hilton, R. P. (2014). First record and phylogenetic significance of a Jurassic diadematacean sea urchin from California. <em>Journal of Paleontology.</em> 88(3): 421-433., available online at https://doi.org/10.1666/13-130
page(s): 421-423; figs 2.1-2, 3.1-3, 4, 5.1-3 [details] Available for editors  Present Inaccurate Introduced: alien Containing type locality
Holotype CASG 72939 [details]
From editor or global species database
Diagnosis Being a basal member of a group that is itself not richly endowed with autapomorphies, Sierradiadema is largely characterized by a plesiomorphic combination of features that uniquely excludes it from other known genera. Therefore, the species diagnosis cannot consist solely of autapomorphies for the genus. Relevant characters distinguishing Sierradiadema kristini from all other taxa are summarized in Table 1, which acts as tabular key to Jurassic and other near-contemporary taxa in diadematacean groups. Sierradiadema kristini is unique among diadematacean urchins in possessing thin, non-verticillate primary spines approximately equal in length to test diameter. Primary spines of almost constant diameter, but filled with internal meshwork running almost their entire length. [details]Etymology Named after Kristin Hilton, the discoverer of the fossil echinoid [details] Stratigraphy Colfax sequence of the Mariposa Formation [details] Type locality Middle Fork American River drainage of the northern Sierra Nevada, California [details] Type material Holotype: CASG 72939 [details] |