The Echinoid Directory

Lambertechinus Cossman, 1899, p. 45

[=Asteropsis Cotteau, 1883, p. 21, non Muller & Troschel, 1840 (objective); =Actinopis lambert, 1897, p. 500, non Dana, 1856 (objective) ]

Diagnostic Features
  • Test wheel-shaped, depressed below, slightly raised above.
  • Apical disc moderate in size, pentagonal, a little less than one-third test diameter in length. Plates not bound to corona, always missing; presumed monocyclic.
  • Ambulacra straight; plating polygeminate (5-6 elements to a plate), compounded in phymosomatid style. Pore-pairs undifferentiated; biserially arranged aborally to the ambitus, in arcs subambitally. No phyllodes adorally.
  • A single primary tubercle to each compound plate. Smaller secondaries and granules perradially.
  • Interambulacral plates wider than tall; with a single primary tubercle, positioned centrally and adradial and interradial bands of much smaller secondary tubercles flanking. On adoral surface an adradial band of secondary tubercles form a marginal line. A short naked interradial zone present aborally.
  • Tubercles imperforate and crenulate with relatively small mamelon; not dominating plate.
  • Peristome small, circular, distinctly sunken, with small, but clearly defined buccal notches with thickened lip; no tag.
  • No sphaeridial pits; no basicoronal interambulacral plate.
  • Spines unknown.
  • Lantern unknown.
Distribution
Upper Cretaceous, western Europe.
Name gender masculine
Type
Asteropsis lapparenti Cotteau, 1883, p. 21, by original designation.
Species Included
  • L. lapparenti (Cotteau, 1883); Senonian, France. 
Classification and/or Status

Euechinoidea, Phymosomatoida, Phymosomatidae.

Subjective junior synonym of Psilosoma Pomel, 1883

Remarks
Cotteau, G. 1883 Echinides nouveaux ou peu connus Bulletin de la Societe zoologique de France 8,

Cossmann, M. 1899. Revue critique de Paleozoologie 3, p. 45.