The Echinoid Directory

Contributed by Andrew Smith, August 2011

Calilampas Squires & Demetrion, 1996, p. 512

Diagnostic Features
  • Test rounded
  • Apical disc slightly anterior of centre; monobasal with 4 gonopores
  • Petals well developed , the posterior pair slightly longer.  Petal columns subequal; converging distally but ends of petals remain open. Perradial zone broad and flush
  • Phyllodes well developed with inner and outer series of pores; all pores single.  Buccal pores present.  Perradial sphaeridial pits present
  • Basicoronal plate short, forming verticual vestibular entrance to the peristome and covered in fine dense tubercles. 
  • Peristome pentagonal; broader than long
  • Periproct transverse; just inframarginal on posterior face.
Distribution Lower Eocene, USA (California)
Name gender feminine
Type Calilampas californiensis Squires & Demetrion, 1996, p. 514, by original designation.
Species Included Only the type species.
Classification and/or Status Cassiduloida, Echinolampadidae

Remarks Squires & Demetrion originally placed this in the Pliolampadidae but its suite of characters suggest affinities with Echinolampadidae.  It resembles Kephrenia but differs from that taxon in having its peristome wider than long.

Squires, R. I. & Demetrion, R. A. 1996. A new genus of cassiduloid echinoid from the Lower Eocene of the Pacific Coast of western North America and a new record of Cassidulus ellipticus Kew, 1920, from the Lower Eocene of Baja California Sur, Mexico. Journal of Paleontology 69(3), 509-515.