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Rhyssochonetes
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Chonetoidea
Family:
Chonetidae
Formal Genus Name and Reference:
Rhyssochonetes Johnson, 1970B, p. 2095
Type Species:
R. aurora solox, OD
Images
(Click to enlarge in a new window)
Fig. 257, 5a-d. *R. solox, Givetian, Nevada, a, b, ventral valve exterior, interior, c, d, dorsal valve interiors, X4 (Johnson, 1970b)."
Synonyms
Cedulia
Geographic Distribution
North America, northern France
Age Range
Beginning Stage in Treatise Usage:
Middle Devonian (Givetian)
Beginning International Stage:
Givetian
Fraction Up In Beginning Stage:
0
Beginning Date:
385.3
Ending Stage in Treatise Usage:
Upper Devonian (Frasnian)
Ending International Stage:
Frasnian
Fraction Up In Ending Stage:
100
Ending Date:
371.1
Description
Shell small, transversely elongate, moderately concavoconvex, radial ornamentation of rounded costellae crossed by fine, closely spaced fila, orthomorph oblique, high-angled, symmetrically arranged spines, periphery of ventral interior ornamented with concentric undulating ridges, corresponding to fila, variably developed cardinal process pit, inner socket ridges variably elongate, almost parallel to hinge line, anderidia relatively short, anteriorly divergent at 60° to 70°, septum poorly developed, sometimes absent or extending anteriorly as breviseptum, no accessory septa.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Chonetoidea
Family:
Chonetidae
Formal Genus Name and Reference:
Rhyssochonetes Johnson, 1970B, p. 2095
Type Species:
R. aurora solox, OD
Images
(Click to enlarge in a new window)
Fig. 257, 5a-d. *R. solox, Givetian, Nevada, a, b, ventral valve exterior, interior, c, d, dorsal valve interiors, X4 (Johnson, 1970b)."
Synonyms
Cedulia
Geographic Distribution
North America, northern France
Age Range
Beginning Stage in Treatise Usage:
Middle Devonian (Givetian)
Beginning International Stage:
Givetian
Fraction Up In Beginning Stage:
0
Beginning Date:
385.3
Ending Stage in Treatise Usage:
Upper Devonian (Frasnian)
Ending International Stage:
Frasnian
Fraction Up In Ending Stage:
100
Ending Date:
371.1
Description
Shell small, transversely elongate, moderately concavoconvex, radial ornamentation of rounded costellae crossed by fine, closely spaced fila, orthomorph oblique, high-angled, symmetrically arranged spines, periphery of ventral interior ornamented with concentric undulating ridges, corresponding to fila, variably developed cardinal process pit, inner socket ridges variably elongate, almost parallel to hinge line, anderidia relatively short, anteriorly divergent at 60° to 70°, septum poorly developed, sometimes absent or extending anteriorly as breviseptum, no accessory septa.