The Echinoid Directory

Scagliaster Munier-Chalmas, 1891, p. 11

[=Holasteropsis Elbert, 1902, p. 115, type species Holasteropsis credneriana Elbert, 1902 (=Pseudananchys latissima Roemer, 1940)]

Diagnostic Features	Test weakly cordiform; anterior sulcus virtually absent aborally; developed as a shallow clearly marked furrow on oral surface; base flat. Apical disc with four gonopores; central. Paired ambulacra subpetaloid. Pore-pairs in anterior ambulacrum smaller and more oblique. Columns of pore-pairs almost equally developed in paired ambulacra. Peristome semilunate; facing directly downwards; weakly depressed. Plastron plating unknown. Periproct inframarginal, on oral surface. Coarser tuberculation developed just above ambitus. No fascioles.
Distribution	Upper Cretaceous (Scaglia - i.e. Coniacian to Campanian), Italy.
Name gender	masculine
Type	Ananchytes concava Catullo, 1827, p. 222, by subsequent designation of Lambert, 1923. Mem. Soc. Aube 85, p. 18
Species Included	S. concava (Catullo, 1827); Upper Cretaceous, Italy. S. latissima (Roemer, 1840); Turonian, Germany.
Classification and/or Status	Holasteroida, Meridosternata, Holasteridae. ?Monophyletic.
Remarks	Differs from Holaster (with which it was synonymized by Wagner & Durham), by its oral periproct and distinct anterior groove. Identical to Holasteropsis in all aspects of test morphology that can be discerned. C. Airaghi. 1903. Echinidi della Scaglia Cretacea Veneta. Memorie della Reale Accademia delle Scienze di Torino, serie seconda 53, 315-329, pls 1-2. Munier-Chalmas, M. 1891. Etudes du Tithonique, du Cretace et du Tertiaire du Vicentin. Theses de la Faculte des Sciences de Paris. Paris (A) 150.