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The Echinoid Directory

Pseudananchys Pomel, 1883, p. 45

[=Craginaster Lambert, 1903, type species Holaster completa Cragin, 1892, by original designation; Zumoffenia Fourtau, 1912, p. 50, type species Z. ludovici Fourtau, 1912 ]

Diagnostic Features
  • Test ovate with flat base, domal upper surface and no anterior sulcus.
  • Apical disc subcentral with four gonopores.
  • Slight anterior groove developed below the ambitus.
  • All ambulacra identical with elongate and weakly conjugate pore-pairs adapically; subpetaloid.
  • Plastron plating unknown in type species (meridosternous with offset episternals in P. completa (Cragin)).
  • Peristome ovate; facing downwards; slightly depressed but not connected to the anterior by a sulcus.
  • Periproct supramarginal, just above the ambitus. No truncate face.
  • Aboral tuberculation scattered small tubercles set in a groundmass of sparse granules.
  • No fascioles reported, but marginal fasciole present in at least some material.
Distribution
Cretaceous (Upper Albian - Lower Cenomanian) of Algeria and France, ?Lower Aptian of Tunisia.
Name gender feminine
Type
Ananchys algiris Coquand, 1862, p. 240, by original designation.
Species Included
  • P. algiris (Coquand, 1862); Albian-Cenomanian, Algeria and France.
  • P. completa (Cragin, 1892); Albian, USA.
  • P. ludovici (Fourtau, 1912); Cenomanian, Egypt.
  • P. persica Cotteau & Gauthier, 1895; Cenomanian, Iraq. [includes P. inaequifissa Cotteau & Gauthier, 1895; Cenomanian, Iraq.]
Classification and/or Status

Holasteroida, Meridosternata, Echinocorythidae.

?Paraphyletic by exclusion of Echinocorys
Remarks
Very similar to Echinocorys Leske, 1778, differing primarily in having a marginal to supramarginal periproct and better developed petals. Like Echinocorys it has all five ambulacra identical aborally and is almost certainly the shallow-water sister group to that taxon.

Pomel, A. 1883. Classification méthodique et Genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris pour obtenir le Grade de Docteur ès Sciences Naturelles 503, Aldolphe Jourdan, Alger, 131 pp.