The Echinoid Directory

Contributed by Andreas Kroh, October 2007

Brangema Nicolleau & Vadet, 1995

Diagnostic Features
  • Test small (10 mm), slightly flattened above and below
  • apial disc large; plating lost
  • interambulacral plates with single primary tubercle and very few secondary tubercles
  • ambulacral tubercles much smaller than interambulacral tubercles
  • ambulacral plating style unknown; 3 to 4 pores per primary tubercle. Ambulacral pores uniserially arranged throughout
  • primary tubercles reportedly noncrenulate and imperforate
  • weak buccal notches present
Distribution  Upper Jurassic (Oxfordian), France
Name gender feminine
Type Brangema brangeri Nicolleau & Vadet, 1995, p. 77, by original designation.
Species Included Only the type species.
Classification and/or Status Acroechinoidea incertis sedis

Poorly known
Remarks Originally assigned to the Diadematoida by  Nicolleau & Vadet (1995, p. 77).  However, attribution to the Diadematoida seems improbable due to the reportedly imperforate primary tubercles. Without knowledge of the ambulacral structure this taxon is impossible to place. An attribution to the basal Arbacioida, however, seems more likely that to the Diadematoida (similar forms occur in the Glyphocyphidae, e.g. Pleurodiadema).

Nicolleau, P. & Vadet, A. 1995. Les oursins des Marnes Spongiaires de l'Oxfordien du Poitou. In: Branger, P., Nicolleau, P. & Vadet, A. (eds): Les ammonites et les oursins de l'Oxfordien du Poitou.(facies  spongiaires de l'Oxfordien moyen et superieur) pp. 55-81, 6 pls., 30 figs., 1 tab., Aiffres (Musees de la ville de Niort & A.P.G.P.Poitou - Charentes - Vendee).