Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
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
(Click to enlarge in a new window)
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
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
(Click to enlarge in a new window)
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.