The Echinoid Directory

Zeugaster Lambert, 1907, p. 106

Diagnostic Features
  • Test ovate with shallow anterior sulcus.
  • Apical disc ethmolytic with 4 gonopores. Madreporic plate projecting well to the posterior of the other apical disc plates.
  • Anterior ambulacrum narrow and shallowly sunken throughout; pore-pairs differentiated and presumably associated with funnel-buiilding tube-feet; uniserial.
  • Other ambulacra petaloid, the anterior pair recurved. Petals sunken and parallel-sided; closed distally. The posterior pair almost parallel and confluent adapically. Pore pairs in the two columns differentially developed adapically.
  • Periproct relatively small; towards the top of the near-vertical truncate face.
  • Peristome wider than long; kidney-shaped.
  • Labral plate short and wide. Sternal plates triangular; episternal plates narrowing to posterior.
  • Aboral tubercles small and uniform; no primary tubercles differentiated.
  • Fully formed peripetalous and subanal fascioles. Subanal fasciole bilobed; peripetalous fasciole indented behind anterior petals.
Distribution
Eocene to Recent, Indo-Pacific, Atlantic, Mediterranean.
Name gender masculine
Type
Brissopsis lamberti Gauthier, 1900, p. 42, by original designation.
Species Included
For list of species see Kleinia.
Classification and/or Status

Spatangoida, Micrasterina, Brissopsidae.

Subjective junior synonym of Kleinia Gray, 1855 and Brissopsis Agassiz, 1847

Remarks

Identical to Kleinia in all aspects. Lambert (in Lambert & Thiery 1921) list Brissopsis crescenticus as a member of this genus.

Lambert, J. 1907. Description des echinides fossiles de la Province de Barcelone 2e partie. Memoires de la Societe geologique du France, Paleontologie 14, 59-128, pls 6-10.