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Horridonia
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Productoidea
Family:
Productidae
Formal Genus Name and Reference:
Horridonia CHAO, 1927b, p. 24
Type Species:
Productus horridus J. SOWERBY, 1822 in 1821-1822, p. 17, OD
Images
(Click to enlarge in a new window)
Synonyms
Sowerbina, Pleurohorridonia
Geographic Distribution
Europe, Arctic regions, ?Pakistan (Salt Range)
Age Range
Beginning Stage in Treatise Usage:
Upper Permian
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Medium size, outline pentagonal with wide hinge, weak median sulcus and dorsal fold, ribbing, rugae absent, spines in one to three rows on ears, few scattered on ventral valve, single row near dorsal hinge, dorsal lateral ridges extend to ears, dorsal muscle field rhombic, endospines around anterior margins of disk.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Productoidea
Family:
Productidae
Formal Genus Name and Reference:
Horridonia CHAO, 1927b, p. 24
Type Species:
Productus horridus J. SOWERBY, 1822 in 1821-1822, p. 17, OD
Images
(Click to enlarge in a new window)Synonyms
Sowerbina, Pleurohorridonia
Geographic Distribution
Europe, Arctic regions, ?Pakistan (Salt Range)
Age Range
Beginning Stage in Treatise Usage:
Upper Permian
Beginning International Stage:
Wuchiapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
259.55
Ending Stage in Treatise Usage:
Upper Permian
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Medium size, outline pentagonal with wide hinge, weak median sulcus and dorsal fold, ribbing, rugae absent, spines in one to three rows on ears, few scattered on ventral valve, single row near dorsal hinge, dorsal lateral ridges extend to ears, dorsal muscle field rhombic, endospines around anterior margins of disk.