The Echinoid Directory

• Test relatively thin-plated.
• Apical disc unknown.
• Interambulacra with approximately 6 or 7 plates in a series. Plates almost as tall as wide at ambitus and with primary tubercles widely separated Primary tubercles perforate, weakly crenulate except for most adoral tubercles; mamelons moderate in size. Areoles circular and weakly incised.
• Scrobicular tubercles small and weakly differentiated but forming a distinct rim around the areoles. Extrascrobicular tuberculation sparse and scattered, leaving the margins of ambital and adapical plates almost nude.
• No sutural pits or furrows; sutures not depressed.
• Ambulacral zones more or less straight. Pore zones not incised. Pore-pairs subconjugate. Perradial zone with marginal series of contiguous primary tubercles and only the occasional much smaller tubercle perradially leaving the perradius very sparsely tuberculate.
• Ambulacral tubercles uniform at ambitus but becoming heterogeneous adorally.
• No test with attached spines.

Middle Jurassic (Callovian), France

Remycidaris largiporus Vadet, 2004, p. 12 [?=Rhabdocidaris bigoti Mercier, 1930], by original designation

• Only the type species

Cidaroida, ?Polycidaridae

Monotypic; subjective junior synonym of Nudicidaris Vadet, 1991

The taxon was erected by Vadet (2004) and differentiated from Nudicidaris by its more subconjugate pore-pairs. Guittonicidaris has almost identical test morphology, although its tubercle crenulation is less well developed. It is quite possible that both Remycidaris and Guittonicidaris are based on different-sized individuals of the same species.

Vadet, A. 1991. Revision des "Cidaris" du Lias et du Dogger Europeens. Memoires de la Societe academique du Boulonnais 10, 1-176.

Vadet, A. 2004. Echinides fossiles du Boulonnais. Du Bajocien au Tithonien: les "Cidaris". Annales de la Societe d'Histoire Naturelle du Boulonnais 3, 1-35.