The Echinoid Directory

Strictotiara Lambert & Thiery, 1925, p. 564

Diagnostic Features
  • Test highly depressed, flattened above and below.
  • Apical disc about one-third test diamater, subcircular; plating lost and unknown, presumed monocyclic.
  • Ambulacra straight, narrow. Pore-pairs uniserial, at ambitus, becoming biserially offset adapically in larger specimens, and enlarged to form small phyllodes adorally. Plating trigeminate with all three elements reaching the perradius and overlapped by a primary tubercle on ambital and adoral plates. Polygeminate above ambitus.
  • Interambulacral plates considerably wider than tall, with two subequal primary tubercles forming vertical columns, the inner of which extends from peristome to apex.
  • Ambulacral and interambulacral tubercles similar in size; all perforate and crenulate.
  • Peristome large, circular, weakly sunken; buccal notches small but distinct.
  • Spines and lantern unknown.
Cretaceous (Aptian-Cenomanian), southern Europe and North Africa.
Name gender feminine
Tetragramma argonnensis Lambert, 1927, p. 28, by original designation.
Species Included
  • S. argonnensis Lambert, 1927; Aptian, Spain.
  • Lambert & Thiery also included the following species, none of which have been checked; S. drayi (Fourtau), S. cornueli (Thiery), S. halperti (Fourtau), S. micropyga (Fourtau), S. osiridis (Fourtau), S. sinaica (Desor)
Classification and/or Status
Euechinoidea, Calycina, Phymosomatoida, Emiratiidae, Diplopodiinae.
Lambert & Thiery (1925) distinguished this genus from Tetragramma, Diplopodia and Polydiadema by the narrowness of its apex. The opening in the type species is certainly much more rounded than in the type species of Tetragramma, suggesting a somewhat different apical disc morphology.

Lambert, J. & Thiéry, P. 1909-1925. Essai de Nomenclature Raisonnée des Echinides. L. Ferrière, Chaumont, fasc. 1: i-iii, 1-80, pls. 1-2 (March 1909); fasc. 2: 81-160, pls. 3-4 (July 1910); fasc. 3: 161-240, pls. 5-6 (May 1911); fasc. 4: 241-320, pls. 7-8 (March 1914); fasc. 5: 321-384, pl. 9 (Sept. 1921); fasc. 6-7: 385-512 , pls. 10-11, 14 (Dec. 1924); fasc. 7-8: 513-607, pls. 12, 13, 15 (Feb. 1925) pp.