The Echinoid Directory

Philolectypus Vadet, 1997, p. 22

Diagnostic Features
  • Periproct large and tear-drop-shaped; separated from peristome by four to six interambulacral plates in each column.
  • Fifth genital plate imperforate.
  • Aboral plating smooth and unornamented by pits.
Middle Jurassic (Bajocian-Callovian), France.
Name gender masculine
Holectypus sarthacensis Cotteau, 1856, p. 7, by original designation.
Species Included
  • P. sarthacensis (Cotteau, 1856); Callovian, Middle Jurassic, France.
  • P. leuthardti (Lambert, 1926); Bajocian, France.
  • P. hemisphaericus (Desor, 1842); Toarcian-Bathonian, western Europe.
Classification and/or Status




Differs from Holectypus in having the periproct removed from the peristome and separated by four to six plates.

Vadet, A., Nicolleau, P. & Pineau, J.P. 1998. Echinides du Callovien de la Sarthe et de l'Orne II-B: Les echinides irreguliers: Description. Memoires de la Societe Academique du Boulonnais, Serie Histoire Naturelle 19, 1-128, pls 1-40.

Barras, C. G. 2006. British Jurassic irregular echinoids. Monograph of the Palaeontographical Society no. 625 (part of volume 159 for 2005), 1-168, pls 1-14.