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Magadinella

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

 
 
 
 
 


Genus Magadinella Thomson, 1915, p. 400

[Type species= Magasella woodsiana Tate, 1880 (p. 163)]

Medium, smooth, pyriform to ovate, unisulcate; beak erect to nearly straight; symphytium wide. Strong posterior shell thickening; cardinalia strongly developed with anterior parts of outer hinge plates massively swol- len; cardinal process with swollen anterior boss; dorsal pedicle adjustor muscle attachment sites forming restricted hinge trough, deeply impressed adjacent to cardinal process; loop haptoid to teloform.

Oligocene - Present

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

Extant Species of Magadinella
  • M. mineuri Richardson, 1987
    		•  Diagnosis


    Magadinella mineuri Richardson, 1987

    Type locality: 39°06' S, 147°26' E, 63 m, sandy shell. Australia
    Depth range: 49 - 82 m

    Magadinella mineuri Richardson, 1987 p. 40.

    No Diagnosis

    Shell white to salmon-pink to red, rarely white with longitudinal red stripes. Maximum observed length 21 mm, width 15 mm, depth 10 mm. Outline narrowly ovate to ovate; biconvex, the ventral valve deeper and carinate. Anterior commissure sulcate; lateral com? missures sinuate; cardinal margin strongly curved. Beak erect to nearly straight; deltidial plates fused; beak ridges rounded.
    Dorsal valve interior with prominent adductor mus? cle impressions extending from cardinal platform to an? terior tip of septum. Cardinalia with posteriorly convergent socket ridges, not projecting beyond valve margin, their anterior segments fused medially with crural bases; hinge trough wide posteriorly in area bordered by socket ridges, narrow and shallow in anterior area bordered by crural bases; cardinal process variable in size. Median septum blade-like, slightly higher anteriorly than posteriorly. Loop trabecular.
    Ventral valve interior thickened posteriorly; beak cavity filled except for tunnel leading to foramen. Hinge teeth long, extending full widths of margins of palintropes. Socket ridge articulating surfaces, shallow grooves underlying hinge teeth. Diductor muscle scars well-marked, extending anteriorly to at least half the length of valve.