The Echinoid Directory

• Test of moderate size, with low domed upper surface rising to apical system. Anterior margin blunt, posterior margin slightly pointed, greatest width central. Adoral surface flat with interambulacra slightly raised and ambulacra slightly depressed. Weak anterior notch in type species.
• Apical system slightly anterior, tetrabasal, genital plate 2 is large, extending posteriorly and separating posterior genital plates, but not the posterior ocular plates which remain in contact.
• Petals equal, broad and bowed, tapering distally; poriferous zones wide with conjugate pores, outer pore slit-like; ambulacral pores all double pored.
• Periproct inframarginal, close to posterior margin, subtrigonal.
• Peristome anterior, pentagonal; with vertical-walled entrance.
• Bourrelets convex, largely confined to vertical walled entrance of peristome.
• Phyllodes broad, depressed, all double pored, with three series of pore pairs in each half ambulacrum, the first pore pairs in a phyllode widely separated from the edge of the peristome.
• Buccal pores probably absent.
• Tubercles on adoral surface larger than those on adapical surface.

• Middle Jurassic to Early Cretaceous (Callovian-Valanginian) of Europe and North Africa.

Pygurus jurensis Marcou, 1848, p. 168; by original designation of Vadet, 1997, p. 59.

• Pygurus [Kieripygurus] jurensis Marcou, 1848; Callovian, France.
• Pygurus [Kieripygurus] tenuis Agassiz & Desor, 1847; Callovian-Oxfordian, France and Switzerland.
• Pygurus [Kieripygurus] geryvillensis (Peron & Gauthier in Cotteau, 1888); Kimmeridgian, Algeria.
• Pygurus [Kieripygurus] rostratus Agassiz, 1839; Valanginian, Switzerland.

Irregularia; Neognathostomata; 'pygurid'.

Subjective junior synonym of Pygurus.

Vadet (1997, p. 56-57) distinguishes this genus from Pygurus by the presence of buccal pores in Kieripygurus. However, these appear to be highly irregular. Vadet (1997, p. 57) also illustrates buccal pores in Echinopygus lampas (de la Beche, 1833) which we have never found to be present. We are therefore uncertain of their presence in the species referred by Vadet (1997) to Kieripygurus, and consequently the validity of this genus remains uncertain.

A. Vadet. 1997. Echinides du Callovien de la Sarthe et de l'Orne. II. A les echinides irregulies: analyse et evolution. Memoires de la Societe Academique du Boulonnais Serie Histoire Naturelle, 18 (1), 1-72.

A. Vadet, P. Nicolleau & J. P. Pineau. 1998. Echinides du Callovien de la Sarthe et de l'Orne. II-B. Les echinides irregulies: Description. Memoires de la Societe Academique du Boulonnais Serie Histoire Naturelle, 19 (2-B), 1-128, 40 pls.