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The Echinoid Directory

Contributed by Jenna Sullivan, May 2007

Diademopsis tomesii Wright, 1857, p. 457

Diagnostic Features "Test circular, depressed; ambulacral areas wide, with two rows of small tubercles on the margin of the area, set moderately distant apart; poriferous zones narrow; pairs of pores superimposed in groups of threes; inter-ambulacral areas with two rows of primary tubercles on the centre of the plates, and two rows of secondary tubercles internal to the primaries, which extend from the base and sides above the equator; areolae wide, encircled by granules which likewise cover the surface of the plates. Spines long, slender, and needle-shaped; surface covered with fine, longitudinal lines." (Wright, 1857, p. 458)
Distribution Upper Triassic, Rhaetian, White Lias of  Warwickshire, England.
Type  Syntypes: Natural History Museum E8664, E8665.
Classification and/or Status Pedinoida, Pedinidae

Subjective junior synonym of Diademopsis michelini
Remarks "Much larger than Diademopsis bowerbankii (Wright), which was collected from the same zone of the Lower Lias, near Lyme Regis. Resembles Diademopsis serialis (Leym.), from the Lower Lias of France, but the inner row of tubercles in the interambulacra are more developed and have a greater extension in that species." (Wright, 1857, p. 458).

Wright, T. 1857. Monograph on the British fossil Echinodermata of the Oolitic Formations. Vo. I: The Echinoidea. Palaeontographical Society Monograph.