The Echinoid Directory

Dermechinus Mortensen, 1942, p. 231

Diagnostic Features
  • Test globular; usually taller than wide.
  • Apical disc very small, dicyclic. Periproct small (ca. 30% disc): covered in small granules.
  • Ambulacra trigeminate; pore-pairs very small; forming adradial band with perradial granulation.
  • Interambulacral plates with primary tubercles forming a vertical column and much smaller secondary tubercles forming rows.
  • Plates covered in dense granulation.
  • Peristome very small, smaller than apical disc in diameter. Buccal membrane devoid of spicules.
  • Secondary spines with thorned shaft.
Distribution
Recent; circum Antarctic (S. Africa, S. America, S. Australia).
Name gender masculine
Type
Echinus horridus A. Agassiz, 1879, p. 203, by original designation. Syntype: Museum of Comparative Zoology, Harvard MCZ 1164.
Species Included
Only the type species.
Classification and/or Status

Camarodonta; Echinoida; Echinidae.

Monotypic.

Remarks

Easily recognized by its unusually tall profile, reduced and offset triads of pore-pairs, very small peristome and plate surfaces that are strongly granulated.

Mortensen, T. 1943. A monograph of the Echinoidea Part III, 3. Camarodonta II. C. A. Retzel, Copenhagen.