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Lepidocyclus
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Rhynchotrematoidea
Family:
Rhynchotrematidae
Formal Genus Name and Reference:
Lepidocyclus WANG, 1949, p. 12
Type Species:
L. laddi, OD
Images
(Click to enlarge in a new window)
Fig. 709, 2a-f. *L. laddi, upper Cincinnatian, Maquoketa Formation, Elgin Member, Winneshiek County, Orleans township, Iowa, USA, $a-d$, holotype, dorsal, ventral, lateral, and anterior view, $e-f$, paratype, dorsal valve interior, ventral valve interior, x1$ (Wang, 1949).", "——Fig. 709, 2g-m. L. gigas Wang, upper Cincinnatian, Vaureal Formation, Anticosti Island, Canada, serial sections 1.6, 1.8, $2.0, 2.8, 3.6, 4.3, 5.0 \\mathrm{~mm}$ from posterior, x2$ (Jin, 1989)."
Synonyms
Geographic Distribution
North America, Kazakhstan
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Ashgill)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
0
Beginning Date:
447.72
Ending Stage in Treatise Usage:
Upper Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Medium to large with elongate subcircular to subcircular outline and strongly biconvex profile, Beak erect to incurved, deltidial plates conjunct to disjunct, Fold and sulcus strong, from umbones, anterior commissure uniplicate, tongue trapezoid, tapering dorsally, dentate, Costae strong, angular to subangular, simple, from beaks, with lamellose growth lines, Dental plates reduced or fused to valve walls, ventral muscle field deeply impressed, Dorsal median septum extending to valve midlength, septalium small, cardinal process thin, septiform, hinge plates thick, crural bases horizontal, crura rodlike proximally, becoming laterally flattened distally, ventrolaterally curved
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Rhynchonellida
Superfamily:
Rhynchotrematoidea
Family:
Rhynchotrematidae
Formal Genus Name and Reference:
Lepidocyclus WANG, 1949, p. 12
Type Species:
L. laddi, OD
Images
(Click to enlarge in a new window)
Fig. 709, 2a-f. *L. laddi, upper Cincinnatian, Maquoketa Formation, Elgin Member, Winneshiek County, Orleans township, Iowa, USA, $a-d$, holotype, dorsal, ventral, lateral, and anterior view, $e-f$, paratype, dorsal valve interior, ventral valve interior, x1$ (Wang, 1949).", "——Fig. 709, 2g-m. L. gigas Wang, upper Cincinnatian, Vaureal Formation, Anticosti Island, Canada, serial sections 1.6, 1.8, $2.0, 2.8, 3.6, 4.3, 5.0 \\mathrm{~mm}$ from posterior, x2$ (Jin, 1989)."
Synonyms
Geographic Distribution
North America, Kazakhstan
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Ashgill)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
0
Beginning Date:
447.72
Ending Stage in Treatise Usage:
Upper Ordovician (Ashgill)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Medium to large with elongate subcircular to subcircular outline and strongly biconvex profile, Beak erect to incurved, deltidial plates conjunct to disjunct, Fold and sulcus strong, from umbones, anterior commissure uniplicate, tongue trapezoid, tapering dorsally, dentate, Costae strong, angular to subangular, simple, from beaks, with lamellose growth lines, Dental plates reduced or fused to valve walls, ventral muscle field deeply impressed, Dorsal median septum extending to valve midlength, septalium small, cardinal process thin, septiform, hinge plates thick, crural bases horizontal, crura rodlike proximally, becoming laterally flattened distally, ventrolaterally curved