The Echinoid Directory

Thielicidaris Vadet, 2001, p. 51

[=Order Thielicidaroida Vadet, 2001, p. 51; = Family Thielicidaridae Vadet, 2001, p. 51]

Diagnostic Features
  • Based on a single adoral interambulacral fragment.
  • Tuberculation pattern unclear because sutures not visible; probably one primary and a smaller secondary interradial tubercle.
  • Tubercles perforate and reportedly non-crenulate.
  • Adradial suture denticulate (ambulacral-interambulacral suture imbricate).
  • Perignathic girdle of low adradial apophyses on interambulacral plates plus median node.
  • Ambulacra unknown.
Late Triassic (Carnian); Italy.
Name gender feminine
Thielicidaris thieli Vadet, 2001, p. 51, by original designation. Type in private collection.
Species Included
  • Only the type species.
Classification and/or Status




Looks rather similar to Serpianotiaris but the only known fragment is completely inadequate for detailed comparison to be made. If the tubercles are truly non-crenulate and not just poorly preserved, then this distinguishes the fragment from Serpianotiaris.

Vadet, A. 2001. Revision des echinides de Saint Cassian et evolution des echinides post-carboniferes. Memoires de la Societe Academique du Boulonnais 20, 1-116.