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Requienia
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Hippuritoida (rudists and relatives)
Superfamily:
Hippuritacea (rudists)
Family:
Requieniidae
Formal Genus Name and Reference:
Requienia MATHERON, 1843, p. 102
Type Species:
Chama ammonia GOLDFUSS, 1837, p. 205, OD
Images
(Click to enlarge in a new window)
Fig. E247,3. *R. ammonia (Goldfuss), L.Cret.(U.Barrem.), France (Brouzet), both valves, X0.5 (278a), Fig. E246,1. R. sp., diagrams showing features of hinge, 1 a, b, AV and FV int., X0.7 (252)
Synonyms
Requienites
Geographic Distribution
Eu.-N.Afr.-S.Am.-N.Am.-E.Afr.
Age Range
Beginning Stage in Treatise Usage:
L.Cret.(Valangin.)
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
0
Beginning Date:
137.7
Ending Stage in Treatise Usage:
U.Cret.(Senon.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Highly inequivalve, AV coiled in spiral of several whorls, FV forming flat spiral, ornament of growth wrinkles and fine radial ribs, sinuosities of growth lines on posterior side of AV define 2 siphonal bands, slight thickening behind posterior socket in AV of some species suggests tooth AV muscle attach- ments on shell wall; FV anterior muscle insertion on shell wall, posterior muscle insertion on plate projecting above cardinal platform; pallial line entire.
References
Matheron, Philippe, 1843, Catalogue méthodique et descriptif des corps organisés fossiles du Départment des Bouches-du-Rhone et lieux circonvoisins: 269 p., 41 pl. (Marseilles).
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Hippuritoida (rudists and relatives)
Superfamily:
Hippuritacea (rudists)
Family:
Requieniidae
Formal Genus Name and Reference:
Requienia MATHERON, 1843, p. 102
Type Species:
Chama ammonia GOLDFUSS, 1837, p. 205, OD
Images
(Click to enlarge in a new window)
Fig. E247,3. *R. ammonia (Goldfuss), L.Cret.(U.Barrem.), France (Brouzet), both valves, X0.5 (278a), Fig. E246,1. R. sp., diagrams showing features of hinge, 1 a, b, AV and FV int., X0.7 (252)
Synonyms
Requienites
Geographic Distribution
Eu.-N.Afr.-S.Am.-N.Am.-E.Afr.
Age Range
Beginning Stage in Treatise Usage:
L.Cret.(Valangin.)
Beginning International Stage:
Valanginian
Fraction Up In Beginning Stage:
0
Beginning Date:
137.7
Ending Stage in Treatise Usage:
U.Cret.(Senon.)
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Highly inequivalve, AV coiled in spiral of several whorls, FV forming flat spiral, ornament of growth wrinkles and fine radial ribs, sinuosities of growth lines on posterior side of AV define 2 siphonal bands, slight thickening behind posterior socket in AV of some species suggests tooth AV muscle attach- ments on shell wall; FV anterior muscle insertion on shell wall, posterior muscle insertion on plate projecting above cardinal platform; pallial line entire.
References
Matheron, Philippe, 1843, Catalogue méthodique et descriptif des corps organisés fossiles du Départment des Bouches-du-Rhone et lieux circonvoisins: 269 p., 41 pl. (Marseilles).