The Echinoid Directory

Rispolia Lambert, 1917, p. 217 (27)

Diagnostic Features
  • Test cordate with shallow anterior sulcus. Lower surface flat; posterior truncated.
  • Apical disc somewhat anterior of centre with four gonopores.
  • Paired ambulacra weakly-petaloid; pore-pairs in the two columns subequal.
  • Frontal groove shallow adapically, well developed at ambitus and continuing to peristome as a well-defined groove.
  • Peristome small and circular, facing towards anterior obliquely.
  • Plastron plating meridosternous - labral plate followed by single symmetrical sternal plate, subsequent plating biserial.
  • No enlarged primary tubercles.
  • No fascioles in adult.
Distribution
Upper Cretaceous (Scaglia, Coniacian-Campanian) Europe and Upper Coniacian of North Africa (Tunisia).
Name gender feminine
Type
Nucleolites subtrigonatus Catullo, 1827, p. 34, by original designation [synonym Holaster italicus Agassiz, 1840].
Species Included
  • R. subtrigonata (Catullo, 1827); Upper Cretaceous (Scaglia - i.e. Coniacian-Campanian), Italy and Tunisia. Holaster italicus Agassiz, 1840 from the Scaglia of Roveredo, Italy is a synonym.
Classification and/or Status

Holasteroida, Meridosternata, Stegasterina, Stegasteridae.

Presumed paraphyletic, by exclusion of Seunaster and other stegasterids. Junior subjective synonym of Stegaster.

Remarks

A junior synonym of Stegaster. Differs from Tholaster, Guettaria and Entomaster in lacking major tubercles aborally. The closely related Seunaster has paired episternal plates whereas in Rispolia the episternals are biserial. Lambert & Thiery (1920, p. 413) stated that Rispolia has a fasciole when juvenile which is lost in adults.

The Tunisianspecimen figured here was described and illustrated by Gauthier (1892 Echinides de la Tunisie, p. 34, pl. 1, figs 10-13).

Lambert, J. 1917. Note sur quelques Holasteridae. Bulletin de la Societe des Sciences historiques et naturelles de l'Yonne 1916 (2), 191-223.