Sous-embranchement (subphylum) des Rhynchonelliformea
Classe des Rhynchonellata
Ordre des Terebratulida
Sous-Ordre des Terebratellidina
Super-famille des Megathyridoidea


Genus Dyscritosia Cooper, 1982
[Type species= Dyscritosia secreta Cooper, 1982 (p. 22)]

Small to medium, smooth, subcircular, biconvex, rectimarginate; beak low, attrite, erect; foramen medium, submesothyrid; deltidial plates narrow, disjunct. Cardinalia similar to Aneboconcha. Adult loop trabecular.


Diagnosis from volume 5 of the
Treatise on Invertebrate Paleontology (2006)

Extant Species of Dyscritosia
  • D. secreta Cooper, 1982
  • Diagnosis

    Dyscritosia secreta   Cooper, 1982

    Type locality: “Islas Orcadas cruise 575, sta 89, 54°43.1'S, 036°48.3'W, off the South Sandwich Islands, at 225-265 m.”
    Depth range: 66 - 872 m

    Diagnosis in preparation -

    Foster (1989) suggests that “this species may be an extreme variant of Magellania venosa. (See remarks for M. venosa.)” In this part, this author wrote: “A better understanding of this species is particularly vital in order to adequately evaluate a numberof somewhat similar species that occur in the same area that may be variants of Magellania venosa. These similar specie include: Waldheimia smithi Pfeffer, 1866 (= Anecoboncha smithi Zezina, 1980); Magellania wyvillei Davidson, 1878; Anecoconcha obscura Cooper, 1973a; Syntomaria curiosa Cooper, 1982; and Dysritosia secreta Cooper, 1982.”