The Echinoid Directory

• Test of medium size, elongate, inflated, greatest width and height posterior to centre.
• Apical system tetrabasal, anterior, with four gonopores.
• Petals short, of equal length, wide interporiferous zones, almost twice the width of poriferous zones; poriferous zones in the same petal of equal length, tapering distally. Pore pairs conjugate, outer pore transversely elongate, inner rounded.
• Periproct marginal, longitudinally elongate, slight groove adoral of opening.
• Peristome anterior, pentagonal, slightly depressed.
• Bourrelets moderately developed; forming the slightly bulging walls of the vertical entrance to the peristome.
• Phyllodes single pored, occurring as two or three series in each half ambulacrum.
• Buccal pores present.
• Narrow naked granular zone adoraly in interambulacrum 5.

Upper Cretaceous (Senonian) of Iran.

Pseudocatopygus longior Cotteau & Gauthier, 1895, p. 64; by subsequent designation of Kier, 1962, p. 103.

• P. longior Cotteau & Gauthier, 1895; Senonian, Iran.
• P. declivis Cotteau & Gauthier, 1895; Senonian, Iran.

Irregularia; Cassiduloida; unnamed taxon (gitolampadids).

Subjective junior synonym of Parapygus Pomel, 1883.

Lambert & Thiery (1909-1925, p. 352) and Mortensen (1948, p. 143) consider Pseudocatopygus longior Cotteau & Gauthier, 1895 congeneric with Parapygus cotteauanus (d\'Orbigny, 1856), thus synonymizing Pseudocatopygus as a junior subjective synonym of Parapygus. Kier (1962, p. 104) agreed with Mortensen\'s conclusion, but pointed out that the phyllodes differ slightly, with fewer pores in Pseudocatopygus longior. This appears to be unreliable, particularly as Kier (1962) shows the sphaeridial pits in his drawing (text-fig. 85, p. 102). The position of the periproct does, however, vary slightly between genera, being slightly inframarginal in Parapygus, and distinctly marginal in Pseudocatopygus. Despite this difference, we tentatively synonymize Pseudocatopygus as a subjective junior synonym of Parapygus.

G. Cotteau & V. Gauthier. 1895. Mission scientifique en Perse par J. de Morgan. Etudes Geologiques, Vol. III, 2, Paleontologie, 107 pp., 16 pls, Paris

P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections, 144 (3) 262 pp.

J. Lambert & P. Thiery. 1909-1925. Essai de nomenclature raisonnee des echinides. Libraire Septime Ferriere, Chaumont, 607 pp., 15 pls.

T. Mortensen. 1948. A monograph of the Echinoidea: 4 (1): Holectypoida, Cassiduloida. C. A. Reitzel, Copenhagen, 363 pp., 14 pls.

G. Cotteau & V. Gauthier. 1895. Mission scientifique en Perse par J. de Morgan. Etudes Geologiques, Vol. III, 2, Paleontologie, 107 pp., 16 pls, Leroux, Paris.