The Echinoid Directory

Plesiocorys (Plesiocorys) Pomel, 1883, p. 45

Diagnostic Features
  • Test ovate with flat base, domal upper surface and weak anterior sulcus.
  • Apical disc subcentral with four gonopores.
  • All ambulacra with simple, rounded pore-pairs adapically.
  • Plastron plating uniserial with 2 to 4 post labral plates arranged uniserially.
  • Peristome small and ovate; facing downwards.
  • Periproct on short truncate posterior face.
  • Aboral tuberculation uniform and fine.
  • Marginal fasciole may be present in small individuals of the type species.
Distribution Upper Cretaceous (Turonian to Santonian).
Name gender feminine
Type Holaster placenta Agassiz, in Agassiz & Desor, 1847, p. 27(133), by subsequent designation of Wagner & Durham, 1966, p. U533.
Species Included
  • P. (P.) transiens Smith & Wright, 2003; Turonian, UK.
  • P. (P.) placenta Agassiz, in Agassiz & Desor, 1847; Coniacian, western Europe.
  • P. (P.) basiprocta Smith & Wright, 2003; Santonian, UK..
Classification and/or Status Holasteroida, Cardiasteridae.

Remarks Differs from Plesiocorys (Sternotaxis) in completely lacking any frontal depression, even in small individuals.

Smith, A. B. & Wright, C. W. 2003. British Cretaceous echinoids. Part 7, Atelostomata, 1. Holasteroida. Palaeontographical Society Monographs, London. Pp. 440-568, pls 139-182.