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Parachonetes
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Strophomenata
Order:
Productida
Suborder:
Chonetidina
Superfamily:
Chonetoidea
Family:
Strophochonetidae
Subfamily:
Parachonetinae
Formal Genus Name and Reference:
Parachonetes JOHNSON, 1966b, p. 365
Type Species:
Chonetes macrostriata WALCOTT, 1884, p. 126, OD
Images
(Click to enlarge in a new window)
Fig. 247,1a–e. *P. macrostriatus (WALCOTT), Emsian, Nevada; a,b, ventral valve exterior, ventral, anterior views, ×1; c,d, ventral valve interior, ventral, posterior views, ×1.5; e, dorsal valve mold, ×2 (Johnson, 1966b).
Synonyms
Geographic Distribution
USA
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Pragian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Shell medium to large, strongly concavoconvex, radial rounded, irregular costae, spines orthomorph, high angled to perpendicular, symmetrically arranged, dorsal valve interior with wide, more or less deep cardinal process pit between bases of two lobes of cardinal process, long anderidia anteriorly divergent at 35°, posteriorly fused with cardinal process lobes, well-developed median septum, low, ill-defined inner socket ridges anteriorly divergent at 100° to 130°
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Strophomenata
Order:
Productida
Suborder:
Chonetidina
Superfamily:
Chonetoidea
Family:
Strophochonetidae
Subfamily:
Parachonetinae
Formal Genus Name and Reference:
Parachonetes JOHNSON, 1966b, p. 365
Type Species:
Chonetes macrostriata WALCOTT, 1884, p. 126, OD
Images
(Click to enlarge in a new window)
Fig. 247,1a–e. *P. macrostriatus (WALCOTT), Emsian, Nevada; a,b, ventral valve exterior, ventral, anterior views, ×1; c,d, ventral valve interior, ventral, posterior views, ×1.5; e, dorsal valve mold, ×2 (Johnson, 1966b).
Synonyms
Geographic Distribution
USA
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Pragian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Shell medium to large, strongly concavoconvex, radial rounded, irregular costae, spines orthomorph, high angled to perpendicular, symmetrically arranged, dorsal valve interior with wide, more or less deep cardinal process pit between bases of two lobes of cardinal process, long anderidia anteriorly divergent at 35°, posteriorly fused with cardinal process lobes, well-developed median septum, low, ill-defined inner socket ridges anteriorly divergent at 100° to 130°