The Echinoid Directory

Contributed by Andrew Smith, October 2006

Hypsoheteroclypus Szorenyi, 1953, p. 76

Diagnostic Features
  • Test large, subcircular, domed, adoral surface flat.
  • Apical system monobasal, with small ocular plates.
  • Petals long, extending almost to margin, slightly asymmetric, moderately wide, with interporiferous zones four times the width of poriferous zones; pores slightly conjugate, outer pore of pore-pair slightly elongated transversely, inner pore round; poriferous zones of unequal length.
  • Periproct situated on the flat oral surface, transverse.
  • Peristome, slightly anterior, transverse, pentagonal.
  • Ambulacra deeply sunken towards peristome.
  • Bourrelets greatly developed, inflated, tooth-like, vertically sided.
  • Phyllodes well developed, slight broadening near peristome, single pored, with many pore-pairs arranged in three series in each half-ambulacrum.
  • Buccal pores present.
Distribution Miocene of Mediterranean countries and North Africa.
Name gender masculine
Type Hypsoclypus doma Pomel, 1887, p. 163; by original designation.
Species Included
  • Hypsoheteroclypus doma (Pomel, 1887); Langhian, Algeria.
  • Hypsoheteroclypus vicinoconoideus Szorenyi, 1853; Miocene, Europe.
Classification and/or Status Irregularia; Cassiduloida; Echinolampadidae.

Subjective junior synonym of Hypsoclypus (Heteroclypeus) Cotteau, 1891.
Remarks Szorenyi established Hypsoheteroclypus as a new name for Hypsoclypus and Heteroclypeus, believing that this would reduce the confusion that has arisen in the use of these latter names. Kier (1962, p. 112) states that since both Heteroclypeus and Hypsoclypus are older names, Hypsoheteroclypus cannot stand. Hypsoheteroclypus is considered here to be a subjective junior synonym of Hypsoclypus (Heteroclypeus), as it has a distinctly sunken ambulacra leading to the peristome, with strongly developed (tooth-like) bourrelets; the oral area of H. (Hypsoclypus) is weakly depressed towards the peristome but ambulacral zones are flush and there are only feebly developed bourrelets.

E. Szörenyi. 1953. Miozäne Echinoiden aus den westlichen Teilen der Ukraine. Geologica Hungarica, Series Palaeontologica, 23, 104 pp., 8 pls.

P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections, 144 (3) 262 pp.