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Aneboconcha

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

 
 

 
 
 


Genus Aneboconcha Cooper, 1973

[Type species= Aneboconcha obscura Cooper, 1973 (p. 28)]

Small, smooth, elongate oval, gently unisulcate, beak suberect, foramen large, submesothyrid; deltidial plates disjunct. Cardinal process consisting of transversely oval myophore; socket ridges and outer hinge plates narrow, crural bases narrow, inner hinge plates well developed, uniting with bladelike median septum to form septalium; loop trabecular.

Present

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

Extant Species of Aneboconcha
  • A. obscura Cooper, 1973
  • A. smithii (Pfeffer, 1886)
  • A. eichleri (Allan, 1939)
  • Diagnosis
    Diagnosis
    Comments



    Aneboconcha obscura   Cooper, 1973

    Type locality: “V-17-51. Latitude 55°17.5'S, longitude 66°00'W, at 205-207 meters, off the southeast end of Tierra del Fuego, Argentina.”
    Depth range: 95 - 947 m

    Magellania sp. Blochmann, 1912

    Diagnosis in preparation -



    Aneboconcha smithii * Pfeffer in Martens & Pfeffer, 1886

    Type locality: South Georgia, “Deutschen Station 1882-1883”.
    Depth range: 275 - 970 m

    Waldheimia smithii Pfeffer in Martens & Pfeffer, 1886
    Aerothyris (?) smithi: Allan, 1939
    Aneboconcha smithi: Zezina (1980)

    * The original species name is smithii and thus must be used as it is according to the article 31.1.1. of the International code of Zoological Nomenclature (1999): it has been formed from a personal name that is Latin.

    Foster (1989) pointed out that “A better understanding of this species is particularly vital in order to adequately evaluate a number of 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.”

    Diagnosis in preparation -



    Aneboconcha eichleri   (Allan , 1939)

    Type locality: Kerguelen
    Depth range: 3 - 15 m

    Allan (1939) attributed the specimens figured by Eichler (1911) to a new species of the genus Aerothyris Allan, 1939 under the name A. eichleri, without discussing this change and providing a diagnosis. Eichler's specimens were sampled at the station "Gauss" at less than 10 m depth, in Observatory Bay, by the “Deutsche Südpolar-expedition (1901-103). This bay was named in 1874 by the Challenger Expedition, today “baie de l'Observatoire”, Kerguelen Islands (France).
    Foster (1974) pointed out that these specimens are simply an elongated form of Magellania kerguelensis. Cooper (1981) considered eichleri as synonymous of Aerothyris kerguelensis. Following Allan's statement, Zezina (1980) attributed the specimens collected in Kerguelen islands to Aneboconcha eichleri (Allan, 1939), considering that the specimens figured by Eichler (1911) are not Waldheimia kerguelensis Davidson, 1878. Nevertheless no diagnosis is provided.
    Until more investigations on this species, Eichler's (1911) specimens are considered as belonging to Aerothyris kerguelensis Davidson, 1878.
    Hiller (1994) indicated that A. kerguelensis is the most common of the brachiopods and is the species that extends over the greatest depth range, from less than 50 m deep to more than 500 m. It is particularly abundant in the shallow area of Marion and Prince Edward Islands (South Africa).

    See Aerothyris kerguelensis -