The Echinoid Directory

Contributed by Andrew Smith, August 2011

Pentechinus Philip & Foster, 1971, p. 678

Diagnostic Features
  • Small test size
  • Apical disc dicyclic with raised ocular plates; surface of plates with nodular sculpture.  In female distal portions of genital plates strongly introverted to form the proximal walls of a marsupium. Genital pores (5) large, located at the estremity of the genital plates within the marsupium
  • Ambulacral zones only slightly narrower than interambulacral zones; poriferous tract narrow in weakly offset triads.  Plate compounding echinoid and trigeminate; primary tubercle to each compound plate.
  • Interambulacral plates relatively high and carrying a primary tubercle. Remainder of surface of plate ornamented with tear-drop shaped epistroma
  • Peristome small, circular with feeble buccla notches
  • Perignathic girdle of low styliform auricles not united above the ambulacra and high apophyses.
Distribution Late Oligocene, Australia
Name gender masculine
Type Pentechinus mirabilis Philip & Foster, 1971, p. 678, by original diagnosis.
Species Included Only the type species.
Classification and/or Status Camarodonta, Temnopleuroida, Temnopleuridae

Remarks Easily distinguished from other temnopleurids on account of its five highly characteristic brood pouches.  Test morphology of males is currently unreported.

Philip, G. M. & Foster, R. J. 1971. Marsupiate Tertiary echinoids from south-eastern Australia and their zoogeographical significance. Palaeontology 14, 666-695.