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Permophorus
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Carditacea
Family:
Permophoridae
Subfamily:
Permophorinae
Formal Genus Name and Reference:
Permophorus CHAVAN, 1954 [pro Pleurophorus King, 1844 (non Mulsant, 1842)]
Type Species:
Arca costata BROWN, 1841, M
Images
(Click to enlarge in a new window)
Fig. E44,1. P. albequus (Beede), L.Perm., USA(Tex.), 1a, b, RV int., LV int., ×2, ×3 (665) .--Fig. E45,3. *P. costatus (Brown), Perm. (Upper Magnesian Ls.), Souter Point, Durham, Eng., 3a, latex cast int. RV, ×3.3 (Logan, 1964, Fig. 8), showing two cardinal teeth, 3b, latex cast LV, X3.3 (Logan, 1964, Fig. 9), showing two cardinal teeth (Newell, n)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Subrectangular, solid, with low beaks near anterior end, sculpture rugose concentric, with several posterior radial riblets, lunule and escutcheon well developed. LV hinge with broadly tuberculiform 2, weak, but distinct, 4b and 2 broad, distant, oblique, posterior laterals, RV hinge with 3a as rounded obsolescent tubercle, 3b oblique, strong, sharply defined and posterior lateral submarginal, deep reniform anterior scar in front of myophoric buttress and shallow pedal scar just below 2. [The type specimens of P. costalus are lost and there has betn uncertainty about the charaC[eristics and limits of the genus Permophorus (Logan, 1964, 548). Unpublished studies by NEWELL suggest that more than one species of Permophortls may occur in the British faunas and that the genus is highly variable in American faunas. Fig. E45,30, above (613.62, Hancock Mus., Newcastle upon Tyoe) is here designated as neorype. [NEWELL]]
References
Chavan, André, 1954, Les Pleurophorus et genres voisins: Cahiers Géologiques Seyssel, no. 22, p. 200.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Carditacea
Family:
Permophoridae
Subfamily:
Permophorinae
Formal Genus Name and Reference:
Permophorus CHAVAN, 1954 [pro Pleurophorus King, 1844 (non Mulsant, 1842)]
Type Species:
Arca costata BROWN, 1841, M
Images
(Click to enlarge in a new window)
Fig. E44,1. P. albequus (Beede), L.Perm., USA(Tex.), 1a, b, RV int., LV int., ×2, ×3 (665) .--Fig. E45,3. *P. costatus (Brown), Perm. (Upper Magnesian Ls.), Souter Point, Durham, Eng., 3a, latex cast int. RV, ×3.3 (Logan, 1964, Fig. 8), showing two cardinal teeth, 3b, latex cast LV, X3.3 (Logan, 1964, Fig. 9), showing two cardinal teeth (Newell, n)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
L.Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Subrectangular, solid, with low beaks near anterior end, sculpture rugose concentric, with several posterior radial riblets, lunule and escutcheon well developed. LV hinge with broadly tuberculiform 2, weak, but distinct, 4b and 2 broad, distant, oblique, posterior laterals, RV hinge with 3a as rounded obsolescent tubercle, 3b oblique, strong, sharply defined and posterior lateral submarginal, deep reniform anterior scar in front of myophoric buttress and shallow pedal scar just below 2. [The type specimens of P. costalus are lost and there has betn uncertainty about the charaC[eristics and limits of the genus Permophorus (Logan, 1964, 548). Unpublished studies by NEWELL suggest that more than one species of Permophortls may occur in the British faunas and that the genus is highly variable in American faunas. Fig. E45,30, above (613.62, Hancock Mus., Newcastle upon Tyoe) is here designated as neorype. [NEWELL]]
References
Chavan, André, 1954, Les Pleurophorus et genres voisins: Cahiers Géologiques Seyssel, no. 22, p. 200.