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Pentamerus
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Pentameroidea
Family:
Pentameridae
Formal Genus Name and Reference:
Pentamerus J. SOWERBY, 1813 in 1812-1815, p. 73
Type Species:
P. oblongus J. de C. Sowerby, 1839, p. 641, ICZN, 1954, Opinion 297, Opinion 297 placed Pentamerus J. Sowerby, 1813 in 1812-1815, on the Official List of Generic Names in Zoology, Pentamerus oblongus J. de C. Sowerby, 1839, was designated the type species and added to the Official List of Specific Names in Zoology. The following names were placed on the Official List of Rejected and Invalid Generic Names in Zoology: Gypidia Dalman, 1828, Trimurus Caldwell, 1934, Miopentamerus Alexander (née Caldwell), 1936, Miopentamerus Woods, 1937. Pentamerus laevis J. SOWERBY, 1813 in 1812-1815, was placed in the Official Index of Rejected and Invalid Names in Zoology
Images
(Click to enlarge in a new window)
Fig. 652 a–f. *P. (P.) oblongus; sections showing hinge plate and crural development and spondylium, Wallington Limestone, central New York, USA, ×2 (Gauri & Boucot, 1968).——Fig. 651, 1f–i. Pentamerus sp., USA; f, interior of ventral, Wallington Limestone, central New York, ×2; g, interior of dorsal, Wallington Limestone, central New York, ×1; h, interior of ventral, Wallington Limestone, central New York, ×2, i, interior of dorsal, Louisville Limestone, Louisville, Kentucky, × 3 (Boucot & Johnson, 1979).
Synonyms
Geographic Distribution
North America, Europe, Asia, Australia.
Age Range
Beginning Stage in Treatise Usage:
Silurian (upper Aeronian)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Silurian (Ludlow)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Medium to large, smooth, subequally biconvex, Ziegler's blisters present in small percentage, trilobate, with fold on each valve, ventral median septum about one-half valve length, hinge plates discrete, subparallel, and long. [Ziegler’s blisters (see B OUCOT in B OUCOT & MCCUTCHEON, 1986) are calcitic partitions present in the posterior portion of one or both umbonal chambers; they are anterior of a space that may be filled either with clear calcite or sediment, and are interpreted as a teratological condition; their presence in samples of both Pentamerus and Pentameroides is considered to have phylogenetic value.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Pentamerida
Superfamily:
Pentameroidea
Family:
Pentameridae
Formal Genus Name and Reference:
Pentamerus J. SOWERBY, 1813 in 1812-1815, p. 73
Type Species:
P. oblongus J. de C. Sowerby, 1839, p. 641, ICZN, 1954, Opinion 297, Opinion 297 placed Pentamerus J. Sowerby, 1813 in 1812-1815, on the Official List of Generic Names in Zoology, Pentamerus oblongus J. de C. Sowerby, 1839, was designated the type species and added to the Official List of Specific Names in Zoology. The following names were placed on the Official List of Rejected and Invalid Generic Names in Zoology: Gypidia Dalman, 1828, Trimurus Caldwell, 1934, Miopentamerus Alexander (née Caldwell), 1936, Miopentamerus Woods, 1937. Pentamerus laevis J. SOWERBY, 1813 in 1812-1815, was placed in the Official Index of Rejected and Invalid Names in Zoology
Images
(Click to enlarge in a new window)
Fig. 652 a–f. *P. (P.) oblongus; sections showing hinge plate and crural development and spondylium, Wallington Limestone, central New York, USA, ×2 (Gauri & Boucot, 1968).——Fig. 651, 1f–i. Pentamerus sp., USA; f, interior of ventral, Wallington Limestone, central New York, ×2; g, interior of dorsal, Wallington Limestone, central New York, ×1; h, interior of ventral, Wallington Limestone, central New York, ×2, i, interior of dorsal, Louisville Limestone, Louisville, Kentucky, × 3 (Boucot & Johnson, 1979).
Synonyms
Geographic Distribution
North America, Europe, Asia, Australia.
Age Range
Beginning Stage in Treatise Usage:
Silurian (upper Aeronian)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
66
Beginning Date:
439.24
Ending Stage in Treatise Usage:
Silurian (Ludlow)
Ending International Stage:
Ludfordian
Fraction Up In Ending Stage:
100
Ending Date:
422.73
Description
Medium to large, smooth, subequally biconvex, Ziegler's blisters present in small percentage, trilobate, with fold on each valve, ventral median septum about one-half valve length, hinge plates discrete, subparallel, and long. [Ziegler’s blisters (see B OUCOT in B OUCOT & MCCUTCHEON, 1986) are calcitic partitions present in the posterior portion of one or both umbonal chambers; they are anterior of a space that may be filled either with clear calcite or sediment, and are interpreted as a teratological condition; their presence in samples of both Pentamerus and Pentameroides is considered to have phylogenetic value.]