The Echinoid Directory

Contributed by Dinesh Srivastava, May 2009

Gitolampas mcnamarae Srivastava, Singh, Tiwari & Jauhri, 2008, p. 515

Diagnostic Features	Test small, subpentagonal elongate, anterior ambitus broadly rounded, truncated posteriorly; oral surface flat; highest point of the test at the apical system; margin tumid and well rounded. Apical system monobasal, circular, excentric anteriorly. Petals short, open, subpetaloid to straight and almost reaching the ambitus; III subpetaloid and short; paired petals petaloid, I & V longest and narrowest; poriferous zones of Ia, IIb, IVa and Vb are shorter than their fellows. Pore pairs are conjugated by slightly curved grooves. Peristome pentagonal, excentric anteriorly. Bourrelets and phyllodes (nucleolitid type) fairly well developed. Periproct longitudinally elliptical, supramarginal, close to the posterior ambitus on posterior truncation. Tubercles abundant, non-perforate and crenulate.
Distribution	Eocene, (late Lutetian to early Bartonian); Meghalaya, India.
Type	Holotype: Lucknow University Geology Department LUGD/I/2027; paratypes LUGD/I/2020a. Centre of Advanced Study in Geology, University of Lucknow, Lucknow.
Classification and/or Status	Cassiduloida; 'Gitolampadids' A species of Gitolampas Gauthier, 1889
Remarks	Gitolampas mcnamarae differs from G. enormis (Duncan and Sladen) described from the Eocene sediments of Sind, Pakistan (Duncan & Sladen, 1882-1886) in having higher test, longitudinally elliptical periproct and less developed phyllodes. Duncan, P. M. & Sladen, W. P., 1882 - 1886. Fossil Echinoidea of Western Sind and the Coast of Biluchistan and of the Persian Gulf, from Tertiary formations. Palaeontologica Indica, Series14, 1(3): 392 pp., 58 pls. Srivastava, D. K., Singh, A. P., Tiwari, R. P. & Jauhri, A. K., 2008. Cassiduloids (Echinoidea) from the Siju Formation (late Lutetian-early Bartonian) of the South Garo Hills, Meghalaya, India, Revue de Paleobiologie, 27(2): 511-523.