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Geranocephalus
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Stringocephaloidea
Family:
Stringocephalidae
Formal Genus Name and Reference:
Geranocephalus CRICKMAY, 1954, p. 157
Type Species:
G. inopinus, OD
Images
(Click to enlarge in a new window)
Fig. 1328, 1a-f. * G.inopinus, Nevada, USA; a, dorsal view, ×3; b–c, ventral and lateral views, ×2; d, interior of ventral valve, ×4; e, anterodorsal view of dorsal valve; f, interior of dorsal valve, ×3 (Johnson, Boucot, & Gronberg, 1968).
Synonyms
Acrothyris, Catacephalus, Conomimus
Geographic Distribution
North America, Europe, Asia, Australia
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:
Middle Devonian (Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Medium, smooth, ventribiconvex, dental plates short, median septae absent in both valves, crural plates absent, cardinal plate formed from conjunct hinge plates, large, terminally bifid cardinal process, loop unknown
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Stringocephaloidea
Family:
Stringocephalidae
Formal Genus Name and Reference:
Geranocephalus CRICKMAY, 1954, p. 157
Type Species:
G. inopinus, OD
Images
(Click to enlarge in a new window)
Fig. 1328, 1a-f. * G.inopinus, Nevada, USA; a, dorsal view, ×3; b–c, ventral and lateral views, ×2; d, interior of ventral valve, ×4; e, anterodorsal view of dorsal valve; f, interior of dorsal valve, ×3 (Johnson, Boucot, & Gronberg, 1968).
Synonyms
Acrothyris, Catacephalus, Conomimus
Geographic Distribution
North America, Europe, Asia, Australia
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:
Middle Devonian (Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Medium, smooth, ventribiconvex, dental plates short, median septae absent in both valves, crural plates absent, cardinal plate formed from conjunct hinge plates, large, terminally bifid cardinal process, loop unknown