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Aulacothyris
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Aulacothyris DOUVILLÉ, 1879, p. 277
Type Species:
Terebratula resupinata J. SOWERBY, 1816 in 1815-1818, p. 116, OD
Images
(Click to enlarge in a new window)
Fig. 1440, 2a-d. * A. resupinata (J. Sowerby), Pliensbachian, Somerset, England, dorsal, lateral, anterior views, dorsal valve interior mold showing adductor scars, X1.3 (Muir-Wood, 1965b).
Synonyms
Geographic Distribution
Europe, ?cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Triassic, Lower Jurassic (lower Pliensbachian)
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
Middle Jurassic (Aalenian)
Ending International Stage:
Aalenian
Fraction Up In Ending Stage:
100
Ending Date:
170.9
Description
Subpentagonal in outline, strongly ventribiconvex or concavocarinate to planoconvex, anterior commissure normally unisulcate, umbo small, flattened, incurved with palintrope strongly demarcated, pedicle foramen permesothyrid, commonly telate, interior of shell commonly with much callus thickening, pedicle collar not observed, dental plates angled, subparallel to ventrally convergent, hinge plates convex ventrally, not clearly demarcated from inner socket ridges, septalium rounded V-shaped, median septum moderately high, triangular in cross section, about 0.5 valve length, connection between anterior of loop and septal pillar early in ontogeny, dorsal adductor scars elongate-oval, anterior scars about half size of posterior scars
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Aulacothyris DOUVILLÉ, 1879, p. 277
Type Species:
Terebratula resupinata J. SOWERBY, 1816 in 1815-1818, p. 116, OD
Images
(Click to enlarge in a new window)
Fig. 1440, 2a-d. * A. resupinata (J. Sowerby), Pliensbachian, Somerset, England, dorsal, lateral, anterior views, dorsal valve interior mold showing adductor scars, X1.3 (Muir-Wood, 1965b).
Synonyms
Geographic Distribution
Europe, ?cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Triassic, Lower Jurassic (lower Pliensbachian)
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
Middle Jurassic (Aalenian)
Ending International Stage:
Aalenian
Fraction Up In Ending Stage:
100
Ending Date:
170.9
Description
Subpentagonal in outline, strongly ventribiconvex or concavocarinate to planoconvex, anterior commissure normally unisulcate, umbo small, flattened, incurved with palintrope strongly demarcated, pedicle foramen permesothyrid, commonly telate, interior of shell commonly with much callus thickening, pedicle collar not observed, dental plates angled, subparallel to ventrally convergent, hinge plates convex ventrally, not clearly demarcated from inner socket ridges, septalium rounded V-shaped, median septum moderately high, triangular in cross section, about 0.5 valve length, connection between anterior of loop and septal pillar early in ontogeny, dorsal adductor scars elongate-oval, anterior scars about half size of posterior scars