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Mentzelia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Spiriferinoidea
Family:
Spiriferinidae
Formal Genus Name and Reference:
Mentzelia Quenstedt, 1871 in 1868-1871, p. 522
Type Species:
*Spirifer medianus Quenstedt, 1852 in 18491875, p. 482, OD, =Spirifer mentzeli DUNKER, 1851, p. 287
Images
(Click to enlarge in a new window)
Fig. 1290, 2a-b. * M. mentzeli (Dunker), Middle Triassic, Germany, a-c, dorsal, lateral, and ventral interior views, approximately X1 (Quenstedt, 1871 in 1868-1871), d-g, transverse sections, approximately X2 (Dagys, 1963), h, microornament, X12 (new).
Synonyms
Geographic Distribution
Tethyan geosyncline
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Upper Triassic
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Medium size, subequally biconvex, outline subovate, cardinal extremities well rounded, ventral umbonal region slightly compressed, beak incurved, ventral interarea low to moderately high, smooth, concave, apsacline, fold and sulcus lacking or variably developed, smooth and rounded, if present, macroornament usually lacking, rarely with few obscure plicae, microornament of very dense, fine spinules, high median septum apically fused with short dental flanges forming false spondylium, jugum incomplete.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferinida
Superfamily:
Spiriferinoidea
Family:
Spiriferinidae
Formal Genus Name and Reference:
Mentzelia Quenstedt, 1871 in 1868-1871, p. 522
Type Species:
*Spirifer medianus Quenstedt, 1852 in 18491875, p. 482, OD, =Spirifer mentzeli DUNKER, 1851, p. 287
Images
(Click to enlarge in a new window)
Fig. 1290, 2a-b. * M. mentzeli (Dunker), Middle Triassic, Germany, a-c, dorsal, lateral, and ventral interior views, approximately X1 (Quenstedt, 1871 in 1868-1871), d-g, transverse sections, approximately X2 (Dagys, 1963), h, microornament, X12 (new).
Synonyms
Geographic Distribution
Tethyan geosyncline
Age Range
Beginning Stage in Treatise Usage:
Middle Triassic
Beginning International Stage:
Anisian
Fraction Up In Beginning Stage:
0
Beginning Date:
246.7
Ending Stage in Treatise Usage:
Upper Triassic
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Medium size, subequally biconvex, outline subovate, cardinal extremities well rounded, ventral umbonal region slightly compressed, beak incurved, ventral interarea low to moderately high, smooth, concave, apsacline, fold and sulcus lacking or variably developed, smooth and rounded, if present, macroornament usually lacking, rarely with few obscure plicae, microornament of very dense, fine spinules, high median septum apically fused with short dental flanges forming false spondylium, jugum incomplete.