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Zeilleria
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Zeilleria BAYLE , 1878, expl. pl. 9 (no page number)
Type Species:
Terebratula cornuta J. de C. SOWERBY , 1824 in 1823–1825, p. 66; SD DOUVILLÉ , 1879, p. 275
Images
(Click to enlarge in a new window)
Fig. 1439, 1a–d. *Z. cornuta (J. de C. SOWERBY), middle Lias, Somerset, England; a–c, dorsal, lateral, anterior views; d, internal mold showing adductor scars, ×1.3 (Muir-Wood, 1965b).——Fig . 1439, 1e. Z. quadrifida (VALEN CIENNES in L AMARCK ), middle Lias, France; dorsal view showing quadrilobation, ×0.7 (Muir-Wood, 1965b).——Fig. 1439, 1f–uu. Z. leckenbyi (DAVIDSON ex W ALKER MS), lower Aalenian, Gloucestershire, England; f, dorsal valve interior, reconstruction, ×1.3 (Baker, 1972); g–aa, serial transverse sections, early juvenile shell, 0.15, 0.36, 0.45, 0.54, 0.69, 0.75, 0.87, 0.99, 1.20, 1.29, 1.59, 1.74, 1.80, 1.86, 1.92, 2.04, 2.07, 2.10, 2.46, 2.79, 3.12 mm from umbo, ×4; bb–uu, serial transverse sections, adult shell 1.4, 2.8, 3.5, 4.2, 4.9, 5.6, 7.0, 7.7, 9.1, 9.8, 11.2, 11.9, 12.6, 15.4, 16.1, 16.8, 19.6, 20.3, 21.0, 21.7 mm from umbo, ×0.65 (adapted from Baker, 1972).
Synonyms
Columellithyris, Sinusella
Geographic Distribution
Europe (or cosmopolitan), Lower Jurassic.
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic, Lower Jurassic
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Middle Jurassic
Ending International Stage:
Callovian
Fraction Up In Ending Stage:
100
Ending Date:
161.53
Description
Small to large, subpentagonal, bilobate or quadrilobate outline, biconvex, becoming anteriorly lobate with no posterior dorsal sulcation, umbo suberect to much incurved, beak ridges clearly delimiting palintropes, foramen permesothyrid, commonly telate; pedicle collar absent, dental plates strong, slightly inwardly concave, ventrally divergent; cardinal process exceptionally represented by callus lobe, hinge plates ventrally deflected and convex ventrally in section, septalium broadly U-shaped, commonly with anterior median groove, median septum triangular in cross section, extending about 0.3 valve length, loop almost reaching anterior, with spinose, descending branches, connection between anterior of loop and septal pillar early in ontogeny; dorsal adductor scars subcircular. [Distinction of Columellithyris, based on the absence of inner hinge plates and the unresorbed remnant of a septal pillar, cannot be sustained, as a septalium is clearly present and a septal pillar remnant is present in the ontogeny of Zeilleria. Distinction based on three specimens and resting solely on the presence of a shallow sulcus in the anterior half of the ventral valve is not valid; Sinusella is therefore regarded as a synonym of Zeilleria.]
References
Museum or Author Information
Classification
Phylum:
Class:
Rhynchonellata
Order:
Terebratulida
Superfamily:
Zeillerioidea
Family:
Zeilieriidae
Formal Genus Name and Reference:
Zeilleria BAYLE , 1878, expl. pl. 9 (no page number)
Type Species:
Terebratula cornuta J. de C. SOWERBY , 1824 in 1823–1825, p. 66; SD DOUVILLÉ , 1879, p. 275
Images
(Click to enlarge in a new window)
Fig. 1439, 1a–d. *Z. cornuta (J. de C. SOWERBY), middle Lias, Somerset, England; a–c, dorsal, lateral, anterior views; d, internal mold showing adductor scars, ×1.3 (Muir-Wood, 1965b).——Fig . 1439, 1e. Z. quadrifida (VALEN CIENNES in L AMARCK ), middle Lias, France; dorsal view showing quadrilobation, ×0.7 (Muir-Wood, 1965b).——Fig. 1439, 1f–uu. Z. leckenbyi (DAVIDSON ex W ALKER MS), lower Aalenian, Gloucestershire, England; f, dorsal valve interior, reconstruction, ×1.3 (Baker, 1972); g–aa, serial transverse sections, early juvenile shell, 0.15, 0.36, 0.45, 0.54, 0.69, 0.75, 0.87, 0.99, 1.20, 1.29, 1.59, 1.74, 1.80, 1.86, 1.92, 2.04, 2.07, 2.10, 2.46, 2.79, 3.12 mm from umbo, ×4; bb–uu, serial transverse sections, adult shell 1.4, 2.8, 3.5, 4.2, 4.9, 5.6, 7.0, 7.7, 9.1, 9.8, 11.2, 11.9, 12.6, 15.4, 16.1, 16.8, 19.6, 20.3, 21.0, 21.7 mm from umbo, ×0.65 (adapted from Baker, 1972).
Synonyms
Columellithyris, Sinusella
Geographic Distribution
Europe (or cosmopolitan), Lower Jurassic.
Age Range
Beginning Stage in Treatise Usage:
Upper Triassic, Lower Jurassic
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
Middle Jurassic
Ending International Stage:
Callovian
Fraction Up In Ending Stage:
100
Ending Date:
161.53
Description
Small to large, subpentagonal, bilobate or quadrilobate outline, biconvex, becoming anteriorly lobate with no posterior dorsal sulcation, umbo suberect to much incurved, beak ridges clearly delimiting palintropes, foramen permesothyrid, commonly telate; pedicle collar absent, dental plates strong, slightly inwardly concave, ventrally divergent; cardinal process exceptionally represented by callus lobe, hinge plates ventrally deflected and convex ventrally in section, septalium broadly U-shaped, commonly with anterior median groove, median septum triangular in cross section, extending about 0.3 valve length, loop almost reaching anterior, with spinose, descending branches, connection between anterior of loop and septal pillar early in ontogeny; dorsal adductor scars subcircular. [Distinction of Columellithyris, based on the absence of inner hinge plates and the unresorbed remnant of a septal pillar, cannot be sustained, as a septalium is clearly present and a septal pillar remnant is present in the ontogeny of Zeilleria. Distinction based on three specimens and resting solely on the presence of a shallow sulcus in the anterior half of the ventral valve is not valid; Sinusella is therefore regarded as a synonym of Zeilleria.]