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Holcothyris
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Loboidothyridoidea
Family:
Postepithyrididae
Formal Genus Name and Reference:
Holcothyris Buckman, 1918, p. 125 (BUCKMAN, 1915, p. 78, nom. nud.)
Type Species:
* H. angulata, OD
Images
(Click to enlarge in a new window)
Fig. 1401, 7a-m. * H. angulata, Burma, a-c, dorsal, lateral, and anterior views of holotype, X1 (MuirWood, 1965a), d-m, serial transverse sections of specimen, France, 2.1, 3.1, 3.5, 4.0, 5.2, 5.8, 7.6, 10.0, 10.5, 10.9 ~mm from ventral umbo, X1 (Alméras, 1971).
Synonyms
Geographic Distribution
Burma, China, India, Europe, New Zealand
Age Range
Beginning Stage in Treatise Usage:
Middle Jurassic (Bathonian)
Beginning International Stage:
Bathonian
Fraction Up In Beginning Stage:
0
Beginning Date:
168.17
Ending Stage in Treatise Usage:
Middle Jurassic (Bathonian)
Ending International Stage:
Bathonian
Fraction Up In Ending Stage:
100
Ending Date:
165.29
Description
Medium size, smooth, finely capillate where exfoliated, subpentagonal, biconvex, anterior commissure unisulcate to paraplicate, beak suberect, foramen possibly permesothyrid, symphytium usually concealed, pedicle collar moderately long, cardinal process bilobate, medianly depressed, hinge plates concave ventrally, club shaped posteriorly, loop 0.5 dorsal valve length
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Loboidothyridoidea
Family:
Postepithyrididae
Formal Genus Name and Reference:
Holcothyris Buckman, 1918, p. 125 (BUCKMAN, 1915, p. 78, nom. nud.)
Type Species:
* H. angulata, OD
Images
(Click to enlarge in a new window)
Fig. 1401, 7a-m. * H. angulata, Burma, a-c, dorsal, lateral, and anterior views of holotype, X1 (MuirWood, 1965a), d-m, serial transverse sections of specimen, France, 2.1, 3.1, 3.5, 4.0, 5.2, 5.8, 7.6, 10.0, 10.5, 10.9 ~mm from ventral umbo, X1 (Alméras, 1971).
Synonyms
Geographic Distribution
Burma, China, India, Europe, New Zealand
Age Range
Beginning Stage in Treatise Usage:
Middle Jurassic (Bathonian)
Beginning International Stage:
Bathonian
Fraction Up In Beginning Stage:
0
Beginning Date:
168.17
Ending Stage in Treatise Usage:
Middle Jurassic (Bathonian)
Ending International Stage:
Bathonian
Fraction Up In Ending Stage:
100
Ending Date:
165.29
Description
Medium size, smooth, finely capillate where exfoliated, subpentagonal, biconvex, anterior commissure unisulcate to paraplicate, beak suberect, foramen possibly permesothyrid, symphytium usually concealed, pedicle collar moderately long, cardinal process bilobate, medianly depressed, hinge plates concave ventrally, club shaped posteriorly, loop 0.5 dorsal valve length