The Echinoid Directory

Boletechinus Cooke, 1955, p. 93

[= Nannoglyphus Nestler, 1978, type species Nannoglyphus wehrlii Nestler, 1978]

Diagnostic Features
  • Test small, hemispherical with flat base.
  • Apical disc small, hemicyclic, posterior genital plate much smaller than the rest. Periproct large, with angular outline to the anterior (large intercalated suranal plate present in juveniles).
  • 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.
  • Interambulacral plates a little wider than tall at the ambitus, with a single primary tubercle.Adradial and interradial zones of granulation well developed from ambitus adapically. Primary tubercles imperforate and crnenulate; a marked increase in size of tubercles beneath the ambitus in both ambulacra and interambulacra.
  • Well developed sutural pitting in both ambulacra and interambulacra.
  • Peristome less than half test diameter; slightly depressed, with almost no buccal notches.
  • Spines and lantern unknown.
Distribution
Upper Cretaceous (Santonian-Maastrichtian), USA.
Name gender masculine
Type
Boletechinus macglameryae Cooke, 1955, p. 93, by original designation.
Species Included
  • B. macglameryae Cooke, 1955; Maastrichtian, USA.
  • B. delawaricus Lewis, 1986; Maastrichtian, USA.
  • B. rowei (Gregory, 1900); Santonian- Campanian, western Europe.
  • B. wehrlii (Nestler, 1978); Maastrichtian, Germany, UK.
Classification and/or Status

Camarodonta; Temnopleuroida; Zeuglopleuridae.

Monophyletic.

Remarks

Lewis (1986) provided a detailed description of the type species. Distinguished from  Echinocyphus and Zeuglopleurus by the marked reduction in size of the primary tubercles above the ambitus which are hard to distinguish from the surrounding secondaries.

Cooke, C. W. 1955. Some Cretaceous echinoids from the Americas. United States Geological Survey, Professional Papers 264-E, 87-112, pls 18-29.

Lewis, D. N. 1986. The Cretsceous echinoid Boletechinus, with notes on the phylogeny of the Glyphocyphidae and Temnopleuridae. Bulletins of the British Museum (Natural History), Geology Series 40, 59-90.

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.