The Echinoid Directory

Contributed by Andrew Smith, September 2006

Pseudorthopsis Sanchez Roig, 1949, p. 37

Diagnostic Features
  • Test large and depressed with rounded ambitus.
  • Apical disc small and dicyclic with relatively large periproct.
  • Ambulacra narrow and compound in acrosaleniid style. All plates reaching the perradial suture. Pore-pairs uniserial adapically but becoming offset towards ambitus into distinct oblique arcs of three with every third pore-pair distinctly indented; slightly crowding of pore-pairs at peristome. Primary tubercle uniting two of the three plates and with granules only on third element.
  • Interambulacral zones wide with large primary interambulacral tubercle flanked by a prominent secondary tubercle on either side in larger individuals. Remainder of plate covered in sparse granules.
  • Tubercles non-crenulate and imperforate; areole never sunken.
  • Buccal notches present but relatively small.
  • Lantern supports, lantern and spines unknown.
Distribution Late Cretaceous (Maastrichtian); Cuba.
Name gender feminine
Type Echinopedina cubensis Cotteau, 1881, p. 9, by original designation.
Species Included Only the type species.
Classification and/or Status Acroechinoidea, Carinacea, Orthopsidae.

Remarks Differs from Orthopsis only in having pore-pairs arranged in oblique triads at the ambitus with every third pore-pair distinctly indented rather than a single series.

Sanchez Roig, M. 1949. Los equinodermos fosiles de Cuba. Paleontologia Cubana 1, 330 pp, 50 pls.

Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene echinoids: A key to world faunas. Special Papers in Palaeontology 64, 1-404.

Cotteau, G. 1897. Descripcion de los equinoides fosiles de la Isla de Cuba. Boletin de la Comision del Mapa Geologico de Espana 22 (2), 1-98, pls 1-29.