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


Genus Syntomaria Cooper, 1982
[Type species= Syntomaria curiosa Cooper, 1982 (p. 20)]

Small, smooth but with prominent growth lines, elongate oval, narrowly biconvex, rectimarginate; beak suberect, attrite, foramen wide, deltidial plates narrow, disjunct. Cardinal process a well-developed transverse myophore; inner hinge plates excavate, uniting on valve floor; septal pillar high, anteriorly inclined, and narrow. Loop annular to incipiently haptoid; descending branches occasionally incomplete.


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

Extant Species of Syntomaria
  • S. curiosa Cooper, 1982

  • Diagnosis

    Syntomaria curiosa   Cooper, 1982

    Type locality: “Islas Orcadas cruise 575, sta 74, 56°12'S, 027°23.9'W, off the South Sandwich Islands, Antarctica, at 179-238 m.”
    Depth range: 161 - 486 m

    Diagnosis (Cooper, 1982) -

    Small, dark brown, biconvex, elongate oval shells with rudimentary deltidial plates and wide foramen.