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The Echinoid Directory

Family Rhabdocidaridae Lambert, 1900, p. 49

Diagnosis	Cidaroids with: Rigidly sutured corona of relatively thin plates; ambulacral plates rather firmly bound to interambulacral plates. Apical disc dicyclic. Interambulacral plates with single large primary tubercle that is perforate and strongly crenulate; areoles shallow; extrascrobicular tuberculation strongly heterogeneous. Ambulacral plating simple throughout; pore-pairs strongly conjugate. Spines long and relatively stout with cortex; often spatulate or facetted with the two sides differentiated; usually coarsely thorned.
Range	Lower Jurassic (Pliensbachian) to Eocene, ? Miocene; widespread.
Remarks	Distinguished from Cidaridae by its strongly crenulate tubercles and from Histocidaridae by its strongly conjugate pore-pairs. Lambert, J. 1900. Etude sur quelques echinides de l'Infra-Lias et du Lias. Bulletin de la Societe des Sciences naturelles et historiques de l'Yonne 52 [for 1899], 3-57.

Diagnosis

Cidaroids with:

Rigidly sutured corona of relatively thin plates; ambulacral plates rather firmly bound to interambulacral plates.
Apical disc dicyclic.
Interambulacral plates with single large primary tubercle that is perforate and strongly crenulate; areoles shallow; extrascrobicular tuberculation strongly heterogeneous.
Ambulacral plating simple throughout; pore-pairs strongly conjugate.
Spines long and relatively stout with cortex; often spatulate or facetted with the two sides differentiated; usually coarsely thorned.

Range

Lower Jurassic (Pliensbachian) to Eocene, ? Miocene; widespread.

Remarks

Distinguished from Cidaridae by its strongly crenulate tubercles and from Histocidaridae by its strongly conjugate pore-pairs.

Lambert, J. 1900. Etude sur quelques echinides de l'Infra-Lias et du Lias. Bulletin de la Societe des Sciences naturelles et historiques de l'Yonne 52 [for 1899], 3-57.