The Echinoid Directory

Echinocyphus Cotteau, in Cotteau & Triger, 1860, p. 226

Diagnostic Features
  • Test depressed above and below, ambitus approximately at mid-height.
  • Apical disc about one-third test diameter; plates loosely connected to corona. Plating hemicyclic with ocular plates I and V exsert. Periproct large and angular with one or more periproctal plates intercalated into the apical disc.
  • Ambulacra more or less straight; plating trigeminate throughout with pore-pairs uniserial. Plate compounding style glyphocyphid with all elements reaching the perradial suture; two elements bearing the primary tubercle with the lower the larger, alternating with a small element.
  • Primary tubercle on each compound plate in type species, but more irregular in other species. Distinct perradial pittingand small pits beneath the primary tubercle.
  • Interambulacral plates a little wider than tall, with a small central primary. Areoles separated by band of granules in each column. The remainder of the plate with small granules arranged in two or three horizontal rows.
  • Primary tubercles imperforate and feebly crenulate; little size difference between oral and aboral tubercles
  • Wedge-shaped pits on either side of primary tubercle and pits in amongst the secondary tubercles.
  • Adapical interradial zones a little sunken and largely tubercle-free.
  • Peristome small with only feeble buccal notches.
  • Perignathic girdle comprises small slender auricles that do not meet perradially.
  • Lantern and spines unknown.
Distribution
Cretaceous, Albian-Turonian, western Europe.
Name gender masculine
Type
Glyphocyphus tenuistriatus Desor, 1856 by original designation.
Species Included
  • E. tenuistriatus (Desor. 1856); Turonian, western Europe.
  • E. rotatus Cotteau, 1865; Upper Albian-Cenomanian, western Europe.
  • E. mespilia (Woodward, 1856); Turonian, western Europe.
  • E. intermedius Smith & Wright, 1996; Upper Cenomanian, UK.
Classification and/or Status
Euechinoidea, Camarodonta, Temnopleuroida, Zeuglopleuridae.
Remarks

Most recently dealt with in detail by Smith & Wright (1993). Distinguished from Boletechinus and Zeuglopleurus by its rather uniform tuberculation and naked, slightly depressed adapical interradial zones.

Cotteau, G. & Triger, J. 1857-1869. Echinides du Département de la Sarthe considérés au point de vue zoologique et stratigraphique. 455 pp., 65 pls. Baillière et fils, Paris.

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.