The Echinoid Directory

Contributed by Dinesh Srivastava, December 2008

Echinolampas khariensis Srivastava and Singh, 1999, p. 26

Diagnostic Features
  • Test large, helmet shaped; oral surface flat but a little depressed at the peristome; highest point of the test at centre.
  • Apical system monobasal, sub-pentagonal, excentric anteriorly.
  • Petals long, open and almost reaching the ambitus; I & V broadest and others have equal width; poriferous zones unequal in all petals except III; Ia, IIb, IVa and Vb are shorter than their fellows. Pore pairs are conjugated by grooves and single row of tubercles is present on coastae between each pore pairs.
  • Peristome pentagonal with steep sides, central and lies in a depression; its longer diameter is almost equal to that of periproct.
  • Bourrelets and phyllodes (nucleolitid type) well developed
  • Periproct inframarginal near the posterior ambitus, transversally oval.
  • Tubercles abundant, non-perforate and non-crenulate.
Distribution Asterocyclina alticostata Zone, middle Eocene; Kachchh (Gujarat), India
Type Holotype No. KTE 283; Paratypes Nos. KTE 284, KTE 286, KTE 287, KTE 296, KTE 297 and KTE 298. Museum, Centre of Advanced Study in Geology, University of Lucknow, Lucknow.
Classification and/or Status Cassiduloida; Echinolampadidae

 A species of Echinolampas Gray, 1825
Remarks Echinolampas khariensis differs from E. alta Duncan & Sladen described from the Eocene sediments of Kachchh (Duncan & Sladen, 1883) in not having circular apical system, slightly flexuous petals I & V and anteriorly excentric peristome. E. khariensis differs from E. feddeni Duncan & Sladen described from the Eocene sediments of Kachchh (Duncan & Sladen, 1883) in not having sinuous petals I & V and anteriorly excentric peristome.

Duncan, P. M. and Sladen, W. P., 1883. The fossil Echinoidea of Kutch and Kattywar. Palaeontologia Indica, Ser. 14 1(4), p. 19, pl. 1, figs. 1-6; p. 23, pl. 1, figs. 8-11.

Srivastava, D. K. and Singh, S. K., 1999. Echinolampas- a cassiduloid echinoid from the Tertiary rocks of Kachchh, India. Journal of the Palaeontological Society of India 44, p. 26, pl. II, figs. 1-5.