The Echinoid Directory

• Test relatively thick and sturdy.
• Apical disc less than 50% test diameter; smaller than peristome; plating unknown.
• Interambulacra composed of 5 to 7 plates per series. Interambulacral plates approximately as wide as tall at ambitus. Primary tubercle with perforate mamelon and non-crenulate platform; mamelons increasing in size adapically. Areoles circular; strongly incised; separated throughout.
• Scrobicular tubercles strongly differentiated. Extrascrobicular tubercles more or less absent except interradially.
• Ambulacra sinuous with pore-pairs subconjugate; the two pores separated by a distance greater than one pore aborally.
• A primary tubercle to every plate except close to the peristome where every other tubercle becomes larger and plating becomes pseudocompound.
• Perignathic girdle of apophyses.
• Peristome large and pentagonal ca. 50% test diameter.
• No associated spines reported.

Upper Jurassic (Kimmeridgian) to Lower Cretaceous, western Europe.

Aulacocidaris lamberti Savin, 1903, p. 170, by original designation.

• A. lamberti Savin, 1903; Kimmeridgian, France.

   

  Lambert included two other species when setting up this genus:

• A. salviensis (Cotteau, 1862); Neocomian, France.
• A. thomasi (Cotteau, 1862); Neocomian, France.
• A. michaleti de Lorio,l 1905; Hauterivian, France.

Cidaroida, Strem group Cidaridae.

Subjective junior synonym of Plegiocidaris.

Close to Caenocidaris in test form, but with more strongly perforate tubercles.

Savin, L. 1903. Catalogue raisonne des echinides fossiles du Departement de la Savoie. Bulletin annuel de la Societe d'Histoire naturelle de la Savoie 1903, 1-195, pls 1-3.