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Athyris

Classification

    Phylum:  
Brachiopoda
    Class:  
Rhynchonellata
    Order:  
Athyridida
    Superfamily:  
Athyridoidea
    Family:  
Athyrididae
    Formal Genus Name and Reference:  
Athyris M'COY, 1844, p. 146
    Type Species:  
Terebratula concentrica von Buch, 1834, p. 103, SD KING, 1850, p. 136


Images

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Fossil ImageFossil Image
Fig. 1013a-g. $* A$. concentrica (von Buch), Eifelian, Eifel, Germany, $a-e$, neotype, dorsal, ventral, lateral, anterior, and posterior views, SMF 5480, x2$, $f-g$, ventral and lateral views showing reconstructed jugum (Alvarez, Brunton, & Struve, 1996).-Fig. 1014a-s. *A. concentrica (von Buch), Eifelian, Eifel, Germany, tangential serial sections, parallel to commissural plane, 1.8, 2.2, 2.5, 2.9, 3.3, 3.6, 3.8, 4.2, 4.6, 5.0, $5.4, 5.8, 5.9, 6.5, 6.6, 7.0, 7.2, 7.3, 11.0 \\mathrm{~mm}$ from dorsal valve, SMF 50013 (Alvarez, Brunton, & Struve, 1996).-Fig. $1014 t$-ii. A. concentrica murchisoni Brice, Upper Devonian, Ferques, France, transverse serial sections 0.6, 1.1, 2.0, 2.8, 3.3, 3.9, 4.2, 5.0, 6.2, 6.9, 7.8, 8.3, 8.8, 9.3, 11.3, 11.5 mm from ventral umbo, BMNH BD12052 (Alvarez, Brunton, & Struve, 1996).-Fig. 1013h. A. spiriferoides (Eaton), Givetian, Michigan, USA, posterolateral view of open shell showing jugum, ventral up, I1106, Hall collection, x2.5$ (new).-Fig. 1013i. A. waratahensis (Talent), Lower Devonian, New South Wales, Australia, lateral view of broken specimen showing jugum, ventral up, ANU 18998, approximately x5$ (Alvarez, 1999a, photograph courtesy of B. D. E. Chatterton).


Synonyms

Cliothyris, Spirigera, Spirithyris, Euthyris


Geographic Distribution

cosmopolitan


Age Range

    Beginning Stage in Treatise Usage:  
Devonian, ?Lower Carboniferous
    Beginning International Stage:  
Lochkovian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
419
    Ending Stage in Treatise Usage:  
Devonian, ?Lower Carboniferous
    Ending International Stage:  
Serpukhovian
    Fraction Up In Ending Stage:  
100
    Ending Date:  
323.4


Description

Small- to medium-sized, dorsi- to strongly dorsibiconvex, equidimensional to slightly transverse, rounded subpentagonal shells covered by numerous, regular, thin, and slightly lamellose growth lines, uniplicate anterior commissure with ill-defined fold in anterior half of adult shell and relatively narrow sulcus originating at ventral beak, groovelike posteriorly but widening strongly anteriorly to about half width of very flat ventral valve, ventral muscle field moderately impressed, cardinal plate flat or slightly concave ventrally, low myophragm may be present.




References



Museum or Author Information

SMF, Alvarez, Brunton, & Struve, 1996, Alvarez, Brunton, & Struve, 1996, Alvarez, Brunton, & Struve, 1996, Alvarez, 1999