The Echinoid Directory

Zeuglopleurus Gregory, 1889, p. 494

[=Zeugopleurus Kier & Lawson, 1978 ]

Diagnostic Features
  • Test small, flatened below and domed above; well rounded ambitus.
  • Apical disc large (ca. 1/3 test diameter). Plates usually bound to corona. Plating hemicyclic with posterior oculars exsert. Periproctal opening angular at anterior; in juveniles with a large suranal plate integrated into the anterior part of the disc. Five gonopores.
  • Ambulacra moderately wide, straight; plating trigeminate with all elements reaching the perradius from the ambitus adapically; the lowest of the three elements the largest. Each compound plate with a large primary tubercle and a perradial line of miliaries. Radial ornament strongly developed.
  • Pore-pairs uniserial throughout; no phyllodes.
  • Interambulacral zones a little wider than ambulacral zones. Plates with a single primary tubercle and adradial and interradial bands of granules. Large wedge-shaped sutural pits on either side beneath the primary tubercle; remainder of plate highly ornamented with miliaries projecting strongly from the surface.
  • Primary tubercles imperforate and strongly crenulate; distinctly larger on oral surface.
  • No naked interradial zone adapically.
  • Peristome a little sunken, with weak buccal notches.
  • Perignathic girdle massive with large, raised interambulacral walls, pointed interradially; auricles not meeting perradially.
  • Lantern camarodont; spines unknown.
Distribution
Upper Cretaceous (Cenomanian-Turonian), Europe, North America.
Name gender masculine
Type
Zeuglopleurus costulatus Gregory, 1889, p. 495, by original designation.
Species Included
  • Z. costulatus Gregory, 1889; Cenomanian - Lower Turonian, UK.
  • Z. dictyopleuroides Smith & Wright, 1993; Turonian, UK.
Classification and/or Status

Camarodonta; Temnopleuroida; Zeuglopleuridae.

Monophyletic.

Remarks

One of the most highly ornamented of Cretaceous genera. Distinguished from Echinocyphus by its strongly sculpted test which lacks an adapical naked interradial zone, and has distinctly larger tubercles on its oral surface than aborally. Boletechinus differs in having adapical primary tubercles greatly reduced and hardly differentiated from surrounding secondaries.

Gregory, J. W. 1889. On Zeuglopleurus, a new genus of the family Temnopleuridae from the Upper Cretaceous. Annals and Magazine of Natural History series 6, 3(1889), 490-500.

Lewis, D. N. 1986. The Cretaceous 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.