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


Genus Megerlia King, 1850

[= Mühlfeldtia Bayle, 1880; Pantalleria Dall, 1919 (type Terebratula monstruosa Sacchi, 1836)]
[Type species= Anomia truncata Linné, 1767 (p. 1152)]

Medium size, usually wider than long, biconvex to concavoconvex; anterior commissure unisulcate; capillate, striae slightly nodulose; foramen large, submesothyrid to amphithyrid; beak suberect, subtruncate, usually abraded; deltidial plates disjunct. Valve interiors radially tuberculate; ventral valve with small median septum extending under but not supporting pedicle collar. No cardinal process; crural bases attached to inner sides of widely divergent socket ridges that are excavate below; loop bifurcate with distal extensions forming complete ring, descending branches extending from cardinalia to ring.
Lophophore plectolophous; spicules common in mantle and arms.

Miocene - Present

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

Extant Species of Megerlia
  • M. truncata (Linné, 1767)
  • M. granosa Seguenza, 1865
  • M. acrura Hiller, 1986
  • Diagnosis


    Megerlia truncata   (Linné, 1767)

    Type locality: "Habitat in Pelago Norvegico supra corallia."
    Depth range: 8 - 1086 m.

    Anomia truncata Linné, 1767
    Terebratula monstruosa Sacchi, 1836
    Criopoderma truncatum (Linné, 1767) Orthis truncata var. Philippi, 1836
    Pantellaria monstruosa Dall, 1919
    Muhlfeldtia disculus (Dall, 1920)
    Megerlia echinata (Fischer & Œlhert, 1890)
    Megerlia gigantea (Deshayes, 1863)

    Diagnosis in preparation -

    Megerlia acrura   Hiller, 1986

    Type locality: East South Africa
    Depth range: 0 - 450 m

    Megerlina gigantea: Zezina (1987)
    Megerlia? gigantea: Zezina (1994)

    Diagnosis in preparation -