The Echinoid Directory

Pseudolinthia Markov, 1994, p. 80

Diagnostic Features	Test cordiform, with deep anterior sulcus; posterior face truncate. Test depressed in profile. Apical disc ethmolytic with three gonopores (no gonopore in G2); subcentral. Anterior ambulacrum sunken from apex. Pore-pairs well developed, arranged uniserially. Petals rather narrow, sunken. The anterior pair straight, extending about two-thirds the way to the ambitus, the posterior about half the length. Peristome close to anterior border. Labrum projecting to partially cover peristome in oral view. Plastron plating with short mushroom-shaped labral plate not projecting beyond first ambulacral plate. Sternal plates symmetrical. Episternal plates forming rear part of plastron, offset. Periproct on posterior truncate face. Peripetalous fasciole present, passing a little beneath the ends of the anterior petals. Latero-anal fasciole present.
Distribution	Palaeocene, Kazakhstan.
Name gender	feminine
Type	Pseudolinthia triporata Markov, 1994, p. 80, by original designation.
Species Included	Only the type species.
Classification and/or Status	Spatangoida, Paleopneustina, Prenasteridae. Monotypic; subjective junior synonym of Tripylus Philippi, 1845
Remarks	Close to Tripylus differing from the type species only in having slightly shorter posterior petals. Markov, A. V. 1994. Morphology, systematics and phylogeny of schizasterid sea urchins. Trudy Paleontologicheskogo Instituta Rossiiskaya Akademiya Nauk 258, 94 pp, 4 pls [in Russian]. Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene echinoids: a key to world faunas. Special Papers in Palaeontology 63, 404 pp.