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Sierradiadema
Taxonomy
Sierradiadema was named by Mooi and Hilton (2014).
It was assigned to Diadematidae by Mooi and Hilton (2014).
It was assigned to Diadematidae by Mooi and Hilton (2014).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2014 | Sierradiadema Mooi and Hilton p. 423 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Sierradiadema Mooi and Hilton 2014
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†Sierradiadema kristini Mooi and Hilton 2014
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. Mooi and R. P. Hilton 2014 | As for the type species. [Being a basal member of a group that is itself notrichly endowed with autapomorphies,Sierradiademais largelycharacterized by a plesiomorphic combination of features thatuniquely excludes it from other known genera. Therefore, thespecies diagnosis cannot consist solely of autapomorphies for thegenus. Relevant characters distinguishingSierradiadema kristinifrom all other taxa are summarized in Table 1, which acts astabular key to Jurassic and other near-contemporary taxa indiadematacean groups.Sierradiadema kristiniis unique amongdiadematacean urchins in possessing thin, non-verticillate prima-ry spines approximately equal in length to test diameter. Primaryspines of almost constant diameter, but filled with internalmeshwork running almost their entire length.] |