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Perichonetes
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Chonetoidea
Family:
Strophochonetidae
Formal Genus Name and Reference:
Perichonetes XU, 1979, p. 372
Type Species:
P. mirabilis, OD
Images
(Click to enlarge in a new window)
Fig. 245, 1a, b. *P. mirabilis, ventral valve external mold, dorsal valve external mold, $\\mathrm{X}_{10} (\\mathrm{Xu}$, 1979).
Synonyms
Geographic Distribution
southern China (Guangxi), northeastern Viet-nam
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Middle Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
Very small, almost planoconvex thin shell, subquadrate to weakly transverse in outline, prominent median enlarged costa, fine radial costellae crossed by concentric growth lines, one or two, orthomorph vertical spines, usually on right side only, ventral interior with narrow ridge surrounding muscle field and anteriorly fusing with myophragm, dorsal interior without median septum, long, narrow socket ridges coalescing with small cardinal process.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Chonetoidea
Family:
Strophochonetidae
Formal Genus Name and Reference:
Perichonetes XU, 1979, p. 372
Type Species:
P. mirabilis, OD
Images
(Click to enlarge in a new window)
Fig. 245, 1a, b. *P. mirabilis, ventral valve external mold, dorsal valve external mold, $\\mathrm{X}_{10} (\\mathrm{Xu}$, 1979).
Synonyms
Geographic Distribution
southern China (Guangxi), northeastern Viet-nam
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Middle Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
Very small, almost planoconvex thin shell, subquadrate to weakly transverse in outline, prominent median enlarged costa, fine radial costellae crossed by concentric growth lines, one or two, orthomorph vertical spines, usually on right side only, ventral interior with narrow ridge surrounding muscle field and anteriorly fusing with myophragm, dorsal interior without median septum, long, narrow socket ridges coalescing with small cardinal process.