The Echinoid Directory

Contributed by Dinesh Srivastava, June 2008

Kachchhia Srivastava, Gupta and Jauhri, 2008, p. 107

Diagnostic Features
  • Test large, low hemispherical.
  • apical disc small.
  • ambulacra polyporous, uniserial; ambulacral plate compounding phymosomatid type (occluded both on aboral and oral sides); each plate has single, imperforate and crenulated primary tubercle lying near pore-pair; 5-7 pore-pairs per ambulacral plate on both aboral and oral sides.
  • interambulacral plats wider than tall and each with single imperforate and crenulated primary tubercle at the middle of the plate.
  • aboral interradial naked zones broad and depressed.
  • peristome sunken, larger than apical disc with peristomial notches and thickened lip.
Distribution Late middle Eocene, Kachchh (Gujarat), India.
Name gender feminine
Type Kachchhia krohi Srivastava, Gupta and Jauhri, 2008 by original designation, p. 108.
Species Included Only the type species.
Classification and/or Status Euechinoidea; Phymosomatoida; Phymosomatidae 
Remarks Easily distinguishable from all other known phymosomatoid genera by its uniserial and less number of pore-pairs per plate throughout the poriferous zone on both aboral and oral sides. Kachchhia  differs from Dixieus Cooke, 1941 in having uniserial and almost identical number of pore-pairs per plate (5-7 pore- pairs) both on aboral and oral sides. Dixieus Cooke, 1941 has 10-12 biserial pore-pairs per plate on aboral side and 5-6 pore-pairs per plate on oral side.

Srivastava, D. K., Gupta Anjali and Jauhri, A. K., 2008. A new regular echinoid from the middle Eocene of Kachchh, western India. Journal of the Palaeontological Society of India, 53(1): 107-110.