The Echinoid Directory

• Test small, hemispherical with flat base; ambitus a little below mid-height.
• Apical disc small, hemicyclic, posterior ocular plates exsert; posterior genital plate smaller than the rest. Periproct large, with weakly angular outline to the anterior.
• Ambulacra straight, moderately wide. Pore-pairs uniserial throughout. Plating in triads with all elements reaching the perradius; two of every three plates overlain by a primary tubercle. Two very large primary tubercles at ambitus, much smaller above and below.
• Interambulacral plates a little wider than tall at the ambitus, with a single primary tubercle.Adradial and interradial zones of granulation narrow.
• Primary tubercles imperforate and crnenulate; aboral tubercles in both ambulacra and interambulacra small and poorly differentiated from granules.
• Well developed interradial and perradial sutural pitting.
• Peristome less than half test diameter; slightly depressed, with almost no buccal notches.
• Spines and lantern unknown.

Upper Cretaceous (Maastrichtian), Germany and UK.

Nannoglyphus wehrlii Nestler, 1978, p. 621, by original designation.

• Only the type species.

Camarodonta; Temnopleuroida; Zeuglopleuridae.

Monotypic; subjective junior synonym of Boletechinus Cooke, 1955.

Having more enlarged, contiguous primary tubercles at the ambitus is the only feature that differentiate this species from  Zeuglopleurus. It was synomymized with Zeuglopleurus by Smith & Wright (1993).

Nestler, H. 1978. Echiniden aus dem Unter-Maastricht der Insel Rugen VI. Ein neuer Vertreter der Temnopleuridae. Zeitschrift fur geologische Wissenschaften 6, 619-625.

Smith, A. B. & Wright, C. W. 1993. British Cretaceous Echinoids. Part 3, Stirodonta 2 (Hemicidaroida, Arbacioida and Phymosomatoida, part 1). Monograph of the Palaeontographical Society (publication no. 593, part of vol. 147), 199-267, pls 73-92.