The Echinoid Directory

Lambertechinus carantonianum (Agassiz, in Agassiz & Desor, 1847)

Diagnostic Features
  • Test wheel-shaped, depressed above and below.
  • Apical disc large, pentagonal, a little less than half test diameter in length, extending slightly into posterior interambulacrum. Plates not bound to corona, always missing; presumed monocyclic.
  • Ambulacra straight; plating polygeminate (5-6 elelments to a plate), compounded in phymosomatid style. Pore-pairs undifferentiated; biserially arranged aborally to the ambitus, in arcs subambitally and expanded into short phyllodes adorally.
  • A single primary tubercle to each compound plate plus a smaller perradial secondary on ambital and adapical plates. Smaller secondaries and granules fill remainder of perradius.
  • Interambulacral plates wider than tall; with a single primary tubercle, positioned centrally plus smaller secondary tubercles flanking, one interradially and usually several adradially, which diminish adorally and adapically. A well developed naked interradial zone present aborally, expanding towards the apex.
  • Tubercles imperforate and crenulate.
  • Peristome small, circular, sunken, with small, but clearly defined buccal notches with thickened lip; no tag.
  • No sphaeridial pits; no basicoronal interambulacral plate.
  • Spines unknown.
  • Lantern unknown.


Species Included
Classification and/or Status

Euechinoidea, Phymosomatoida, Phymosomatidae.

A species of Lambertechinus

Remarks Agassiz, L. & Desor, P. J. E. 1846-1847. Catalogue raisonné des familles, des genres, et des espèces de la classe des échinodermes. Annales des Sciences Naturelles, Troisième Série, Zoologie : 6 (1846): 305-374, pls. 15-16; 7 (1847): 129-168; 8 (1847): 5-35, 355-380.