The Echinoid Directory

Contributed by Andrew Smith, March 2012

Notidisaster Smith & Crame, 2012, p. 318

Diagnostic Features
  • Apical disc strongly disjunct with large interambulacral plates separating the bivium and trivium.  Details of apical disc plating unknown.
  • Ambulacral zones narrow with only rudimentary pores outside the phyllodes
  • Interambulacral plates large, with scattered primary tubercles that are perforate and crenulate set in a sparse field of granules. Oral plating not forming a differentiated plastron.
  • Peristome small, circular and subcentral
  • Periproct marginal in position, not preserved in any specimen
Distribution Lower Cretaceous (Aptian), Alexander Island, Antarctica
Name gender masculine
Type Notidisaster subitus Smith & Crame, 2012, p. 318 by original designation.
Species Included Only the type species.
Classification and/or Status Stem group Atelostomata (disasteroid), family uncertain - possibly a Collyritidae
Remarks The subcentral peristome is very unusual and distinguishes this taxon from all other disasteroids except Cyclolampas and PilematechinusCyclolampas is distinguished because it has well developed phyllodes of crowded pore-pairs adorally and Pilematechinus has a large conjunct apical disc.

Smith, A. B. & Crame, J. A. 2012. Echinoderm faunas from the Lower Cretaceous (Aptian-Albian) of Alexander Island, Antarctica. Palaeontology 55, 305-324.