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


Genus Megerlina Eudes-Deslongchamps, 1884

[Type species= Kraussia lamarckiana Davidson, 1852 (p. 80)]

Small, subpentagonal in outline, ventribiconvex; anterior commissure unisulcate, finely costellate; beak suberect, attrite; foramen submesothyrid, deltidial plates disjunct; valve interiors radially tuberculate. Pedicle collar anteriorly excavate. Cardinal process weak, acutely triangular; inner socket ridges defining deep sockets and enclosing a pair of prominent, nonexcavate, pedicle adjustor scars; crura not developed, descending lamellae extending posteriorly as curved flanges from lateral flanks of bifurcate septal pillar but not reaching cardinalia; septal pillar tapers posteriorly as low, thick median septum; spicules stouter than in Kraussina.

Neogene - Present

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

Extant Species of Megerlina
  • M. lamarckiana (Davidson, 1852)
  • M. pisum (Lamarck, 1819)
  • M. natalensis (Krauss, 1843)
  • M. capensis (Adams & Reeve, 1850)
  • M. davidsoni (Vélain, 1877)
  • M. atkinsoni (Woods, 1878)
  • M. striata Jackson, 1952

  • Diagnosis

    Megerlina davidsoni   (Vélain, 1877)

    Type locality: xx
    Depth range: 3 - 30 m

    Diagnosis in preparation -


    Should be added:
  • Muscle disposition: see Fig. in front - dorsal pedicle adjustor muscle bases not located at the anterior edge of the hinge plate