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Athyrisina
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Athyridoidea
Family:
Athyrididae
Formal Genus Name and Reference:
Athyrisina Hayasaka in Yabe & HAYASAKA, 1920, p. 176
Type Species:
A. squamosa, OD
Images
(Click to enlarge in a new window)
Fig. 1021, 4a-jj. *A. squamosa, upper Emsian, Shuimogou, northern Sichuan, $a-e$, dorsal, ventral, lateral, anterior, and posterior views, x1$ (new, photographs courtesy of the late Chen Yuan-ren), $f-j j$, serial sections 1.7, 2.4, 2.6, 2.8, 3.0, 3.4, 3.8, 4.05, 4.6, 5.1, 6.7, 7.6, 8.6, 9.8, 9.9, 11.4, 11.8, 12.5, 13.0, 13.9, 15.4, 15.7, 16.0, 16.25, 16.7, 17.3, $17.9, 18.25, 18.4, 18.7, 19.1 \\mathrm{~mm}$ from ventral umbo (new).
Synonyms
Plectospirifer, Plectospirifer, Kwangsiella, Pseudoathyrisina, Athyrisinopsis
Geographic Distribution
southern China (Sichuan, Guizhou, Guangxi, Yunnan), northwestern China (Western Qinling, southeastern Gansu, western Shaanxi)
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (lower Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Middle Devonian (Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Medium to large, rounded to transversely elliptical, ventribiconvex shell, ventral sulcus and dorsal fold usually well developed, pauciplicate to costellate, radial elements may bifurcate, concentric lamellae usually well developed, dental plates thin, short, dorsally convergent, lateral apical cavities very narrow, cardinal plate perforated apically by minute foramen, low myophragm may be present, lateral branches of jugum inclined anteriorly, starting posterior to middorsal valve length, accessory jugal lamellae short.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Athyridida
Superfamily:
Athyridoidea
Family:
Athyrididae
Formal Genus Name and Reference:
Athyrisina Hayasaka in Yabe & HAYASAKA, 1920, p. 176
Type Species:
A. squamosa, OD
Images
(Click to enlarge in a new window)
Fig. 1021, 4a-jj. *A. squamosa, upper Emsian, Shuimogou, northern Sichuan, $a-e$, dorsal, ventral, lateral, anterior, and posterior views, x1$ (new, photographs courtesy of the late Chen Yuan-ren), $f-j j$, serial sections 1.7, 2.4, 2.6, 2.8, 3.0, 3.4, 3.8, 4.05, 4.6, 5.1, 6.7, 7.6, 8.6, 9.8, 9.9, 11.4, 11.8, 12.5, 13.0, 13.9, 15.4, 15.7, 16.0, 16.25, 16.7, 17.3, $17.9, 18.25, 18.4, 18.7, 19.1 \\mathrm{~mm}$ from ventral umbo (new).
Synonyms
Plectospirifer, Plectospirifer, Kwangsiella, Pseudoathyrisina, Athyrisinopsis
Geographic Distribution
southern China (Sichuan, Guizhou, Guangxi, Yunnan), northwestern China (Western Qinling, southeastern Gansu, western Shaanxi)
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (lower Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Middle Devonian (Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Medium to large, rounded to transversely elliptical, ventribiconvex shell, ventral sulcus and dorsal fold usually well developed, pauciplicate to costellate, radial elements may bifurcate, concentric lamellae usually well developed, dental plates thin, short, dorsally convergent, lateral apical cavities very narrow, cardinal plate perforated apically by minute foramen, low myophragm may be present, lateral branches of jugum inclined anteriorly, starting posterior to middorsal valve length, accessory jugal lamellae short.