The Echinoid Directory

• Periproct lying along the anterior-posterior axis; larger than suranal plate.
• Apical disc small and raised above the corona; plates tuberculate but without obvious sutural pits.
• Single large suranal plate incorporated into disc. All ocular plates exsert.
• Gonopores close to outer margin of genital plates.
• Ambulacral plating trigeminate orally and at ambitus; aboral portions with tubercle on each element, but every third one enlarged. Aboral ambulacral tubercles imperforate; oral tubercles perforate and crenulate.
• Interambulacral tubercles crenulate and perforate.
• Peristome larger than apical disc.
• Spines unknown.

Middle Jurassic (Callovian), France.

Acrosalenia marcoui Cotteau, 1879, by original designation.

• Only the type species.

Carinacea, Calycina, Salenioida; stem group Saleniidae.

Monotypic.

Close to Acrosalenia but distinguished from that genus by its dicyclic apical disc (in Acrosalenia the periproct is bounded by ocular plates I and V). Distinguished from Hyposaleniinae by having perforate tubercles. Distinguished from Heterosalenia by having the periproct symmetrically placed along the anterior-posterior axis. Pseudosalenia is very similar, with an identical apical disc structure, but has simple ambulacral plating at the ambitus and its adoral ambulacral tubercles are perforate and crenulate.

Vadet, A., Nicolleau, P. & Pineau, J. P. 1996. Echinides du Callovien de la Sarthe et de l'Orne. I: Les echinides reguliers. Memoires de la Societe academique du Boulonnais, Serie Histoire Naturelle 17, 1-184.