Abstract

Three echinoid genera are identified from Visean (Mississippian, Lower Carboniferous) rocks of the Peak District, namely Melonechinus Meek & Worthen, Archaeocidaris M'Coy and Lepidocidaris Meek & Worthen. Even the best preserved specimens from this area only occur as a jumble of plates. Melonechinus etheridgei (Keeping) (Chadian? to Brigantian?) has thick test plates; interambulacral plates are commonly hexagonal; ambulacra include multiple columns of pore pairs; and plate surfaces bear many small secondary tubercles. Archaeocidaris sp. or spp. (Chadian? to Brigantian) has long, robust radioles with a smooth shaft and prominent spinules; associated test plates (mainly interambulacra) are considered coeval. Rare Lepidocidaris sp. (Asbian? to Brigantian), including Archaeocidaris glabrispina (Phillips), is only recognized from rare, smooth radioles; test plates resemble those of Archaeocidaris. Lepidocidaris is only known from the platform carbonate shelf of Derbyshire; other echinoid taxa occur on both the shelf succession and the deeper water carbonate succession deposited adjacent to the shelf.

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