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Martinia
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Martinioidea
Family:
Martiniidae
Formal Genus Name and Reference:
Martinia M'COY, 1844, p. 128
Type Species:
Spirifer glaber Sowerby, 1820 in 1818-1821, p. 123, SD ICZN Opinion 421, 1956b, p. 171
Images
(Click to enlarge in a new window)
Fig. 1149, 2a-b. *M. glabra (Sowerby), Visean, England, lectotype, anterior and dorsal views, X1 (Muir-Wood, 1951).
Synonyms
Pseudomartinia, Paramartinia
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Mississippian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Permian (Lopingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Unequally biconvex, outline subovate to subpentagonal, fold and sulcus weakly to moderately developed, well rounded, often poorly delimited, ventral interarea well developed, apsacline, macroornament absent, microornament often absent, rarely with shagreen (finely pitted) surface, inner shell layers more commonly pitted, ventral interior simple, with dental flanges and impressed lanceolate muscle scar bisected by weak, narrow medial groove that extends from beak region to or near anterior margin, dorsal interior simple, with small ctenophoridium and narrow medial groove similar to that of opposite valve, vascular impressions of both valves pinnate.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Spiriferida
Superfamily:
Martinioidea
Family:
Martiniidae
Formal Genus Name and Reference:
Martinia M'COY, 1844, p. 128
Type Species:
Spirifer glaber Sowerby, 1820 in 1818-1821, p. 123, SD ICZN Opinion 421, 1956b, p. 171
Images
(Click to enlarge in a new window)
Fig. 1149, 2a-b. *M. glabra (Sowerby), Visean, England, lectotype, anterior and dorsal views, X1 (Muir-Wood, 1951).
Synonyms
Pseudomartinia, Paramartinia
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Carboniferous (Mississippian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Permian (Lopingian)
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Unequally biconvex, outline subovate to subpentagonal, fold and sulcus weakly to moderately developed, well rounded, often poorly delimited, ventral interarea well developed, apsacline, macroornament absent, microornament often absent, rarely with shagreen (finely pitted) surface, inner shell layers more commonly pitted, ventral interior simple, with dental flanges and impressed lanceolate muscle scar bisected by weak, narrow medial groove that extends from beak region to or near anterior margin, dorsal interior simple, with small ctenophoridium and narrow medial groove similar to that of opposite valve, vascular impressions of both valves pinnate.