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Gyrostrea
Classification
Phylum:
Mollusca
Class:
None
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Ostreina (oysters)
Superfamily:
Ostreacea
Family:
Gryphaeidae
Subfamily:
Exogyrinae - TRIBE Gryphaeostreni
Formal Genus Name and Reference:
Gyrostrea MIRKAMALOV, 1963, p. 152
Type Species:
Exogyra turkestanensis BOBKOVA, 1949, p. 180, OD
Images
(Click to enlarge in a new window)
Fig. J99,1. *G. twkestanensis (Bobkova), Turon., USSR(Fergana, C.Asia), la-c, types of Bobkova, both valves, left side, right side, post. view, X1 (Bobkova, 1961, photographs by courtesy of \\mathbf{K h}. Kh. Mirkamalov)., -- Fig. J99,2-4. G. akrabatensis Mirkamalov, 1966, Turon. USSR(Gissar Mts., C.Asia), 2, LV int., 3 a, b, both valves, left side, right side, 4 a, b, both valves, left side, right side, all X1 (Stenzel, n )., -- Fig.. J99,5. G. longa (Bobkova, 1961), Turon., USSR(Tadzhik Basin, C.Asia), 5a,b, LV ext., int., X1 (Stenzel, n). [Specimens of Fig. J99,2-5 were whitened for photography and were obtained by courtesy of KH. KH. MIRKAMALOV, Tashkent, USSR.]
Synonyms
Geographic Distribution
U.Cret. (Cenoman.-Turon.), C.Asia (Tadzhik Basin-Gissar Mts. region-Pamir Plateau-Altai Range-Fergana-Afghanistan) - Italy - Tunisia-Palestine-Madag.-N. Am. (Mexico-Texas). [C. calrtledgei (BOSE, 1919) is the Mexico-Texas species. ]
Age Range
Beginning Stage in Treatise Usage:
U.Cret. (Cenoman.)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
U.Cret. (Turon.)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Small to medium-sized, outline quite variable, commonly oval, length to height ratio about 1:1.5, with irregularities, LV highly convex, lacking radial keel, but surface rough with growth squamae, some species without radial ribs, few with rough rounded irregular or continuous ribs well separated from each other, RV flat, with many conspicuous growth squamae, which stand up freely on anterior half of valve, entire shell rather rough looking, spiral beak tending to become detached from general contour of shell by unrolling. (The genus was reproposed as new in MIIlKAMALOV, 1966, p. 43.44. The type species was redescribed carefully by BOBKOVA. 1961, p. 114·117, pI. 25, figs. 1·4; pI. 26, figs. 1-5) who named it ."Exogyra turkestanensis (BORNEMAN, 1935, n. msc.)." If the unexplained n. msc. stands for nomen manuscripum, BORNEMAN'S authorship lacks standing in nomenclature.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
None
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Ostreina (oysters)
Superfamily:
Ostreacea
Family:
Gryphaeidae
Subfamily:
Exogyrinae - TRIBE Gryphaeostreni
Formal Genus Name and Reference:
Gyrostrea MIRKAMALOV, 1963, p. 152
Type Species:
Exogyra turkestanensis BOBKOVA, 1949, p. 180, OD
Images
(Click to enlarge in a new window)
Fig. J99,1. *G. twkestanensis (Bobkova), Turon., USSR(Fergana, C.Asia), la-c, types of Bobkova, both valves, left side, right side, post. view, X1 (Bobkova, 1961, photographs by courtesy of \\mathbf{K h}. Kh. Mirkamalov)., -- Fig. J99,2-4. G. akrabatensis Mirkamalov, 1966, Turon. USSR(Gissar Mts., C.Asia), 2, LV int., 3 a, b, both valves, left side, right side, 4 a, b, both valves, left side, right side, all X1 (Stenzel, n )., -- Fig.. J99,5. G. longa (Bobkova, 1961), Turon., USSR(Tadzhik Basin, C.Asia), 5a,b, LV ext., int., X1 (Stenzel, n). [Specimens of Fig. J99,2-5 were whitened for photography and were obtained by courtesy of KH. KH. MIRKAMALOV, Tashkent, USSR.]
Synonyms
Geographic Distribution
U.Cret. (Cenoman.-Turon.), C.Asia (Tadzhik Basin-Gissar Mts. region-Pamir Plateau-Altai Range-Fergana-Afghanistan) - Italy - Tunisia-Palestine-Madag.-N. Am. (Mexico-Texas). [C. calrtledgei (BOSE, 1919) is the Mexico-Texas species. ]
Age Range
Beginning Stage in Treatise Usage:
U.Cret. (Cenoman.)
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
0
Beginning Date:
100.5
Ending Stage in Treatise Usage:
U.Cret. (Turon.)
Ending International Stage:
Turonian
Fraction Up In Ending Stage:
100
Ending Date:
89.39
Description
Small to medium-sized, outline quite variable, commonly oval, length to height ratio about 1:1.5, with irregularities, LV highly convex, lacking radial keel, but surface rough with growth squamae, some species without radial ribs, few with rough rounded irregular or continuous ribs well separated from each other, RV flat, with many conspicuous growth squamae, which stand up freely on anterior half of valve, entire shell rather rough looking, spiral beak tending to become detached from general contour of shell by unrolling. (The genus was reproposed as new in MIIlKAMALOV, 1966, p. 43.44. The type species was redescribed carefully by BOBKOVA. 1961, p. 114·117, pI. 25, figs. 1·4; pI. 26, figs. 1-5) who named it ."Exogyra turkestanensis (BORNEMAN, 1935, n. msc.)." If the unexplained n. msc. stands for nomen manuscripum, BORNEMAN'S authorship lacks standing in nomenclature.]