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Nanacalathis

Sous-embranchement (subphylum) des Rhynchonelliformea  
Classe des Rhynchonellata 
Ordre des Terebratulida 

Sous-ordre des Terebratulidina 
Super-famille des Terebratuloidae 
Super-famille des Dyscolioidae 
Super-famille des Cancellothyroidea 


Genus Nanacalathis Zezina, 1981
 
[Type species= Nanacalathis minuta Zezina, 1981 (p. 162)]

Costae broad, triangular in cross-section; foramen hypothyrid, beak very attrite; transverse band of loop medially directed towards dorsal valve; loop may be incomplete.

Diagnosis from Lee et al. (2008)

Minute, biconvex, costate; beak suberect, foramen mesothyrid, deltidial plates conjunct. Cardinal process small, socket ridges fusing with crural bases; crura short, converging slightly; loop incomplete

Diagnosis from Treatise vol. 5 (2005)

Present

Extant Species of Nanacalathis
  • M. minuta Zezina, 1981
  • M. atlantica Zezina, 1991
    		• Diagnosis
    Diagnosis


    Nanacalathis minuta   Zezina, 1981

    Type locality: Nazareth bank, Mascarene Plateau [st. 4650, 1960, 17° S, 61° E, 289 m]
    Depth range: 289 m.

    Diagnose in Russian -

    Nanacalathis atlantica   Zezina, 1991

    Type locality: 26°09' N, 44°50' W, at 3650 m, st. 1897, cruise 15 "Akademik Mstislav Keldysh" 1989.
    Depth range: 3227 - 3731 m.

     Eucalathis ? sp.: Cooper (1973)

    Diagnose in Russian -