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Diadema
Taxonomy
Diadema was named as a genus. It is extant.
It was reranked as Cidarites (Diadema) by von Hagenow (1840).
It was assigned to Cidarites by von Hagenow (1840); to Diadematoida by Sepkoski (2002); and to Diadematidae by Fell (1966) and Smith (2009).
It was reranked as Cidarites (Diadema) by von Hagenow (1840).
It was assigned to Cidarites by von Hagenow (1840); to Diadematoida by Sepkoski (2002); and to Diadematidae by Fell (1966) and Smith (2009).
Species
Species lacking formal opinion data
Synonymy list
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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. Diadema
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†Diadema depressum Agassiz 1846
†Diadema pseudodiadema Lamarck 1816
†Diadema subangulare Goldfuss 1826
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. B. Smith 2009 | Test plating rather fragile, although plating effectively sutured throughout; Apical disc hemicyclic with ocular plates II and III exsert in the type species; Large circular periproct without enlarged periproctal plates; genital plates projecting strongly interradially; Ambulacra narrow and straight; pore-pairs non-conjugate, uniserial; phyllodes developed adorally; Ambulacral plating trigeminate with single large primary tubercle per plate except adorally where there may be fewer; Interambulacral zone wide, with ambital plates distinctly wider than tall; Two subequal primary tubercles on ambital plates, sometimes more in larger species; all tubercles perforate and crenulate; Peristome much larger than apical disc, with deep, rounded buccal notches associated with adradial tags; Spines very long and slender; hollow and with verticillate ornament. |