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Megastrophia
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Strophodontidae
Formal Genus Name and Reference:
Megastrophia CASTER, 1939, p. 37
Type Species:
Stropheodonta concava HALL, 1857, p. 140, OD
Images
(Click to enlarge in a new window)
Fig. 189, $1 a-e .*$ M. concava (Hall), Givetian, $a, b$, ventral, lateral views of conjoined valves, Hamilton Group, York, AMNH 37197, XI, $c$, ventral interior, Hamilton Group, Canandaigua Lake, AMNH 37196, x1$, d, dorsal interior, Hamilton Group, Darien, New York, BMNH B 9580, X1, e, partial dorsal interior showing cardinal process, Silica Shale, Travers Group, Sylvania, Ohio, BMNH BB 16709, X1.5 (new)."
Synonyms
Geographic Distribution
North America, Asia (Altai-Sayan)
Age Range
Beginning Stage in Treatise Usage:
Devonian (Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Devonian (Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Large shells, with strongly concavoconvex profile, ornament costellate to unequally parvicostellate, denticulate along two-thirds of hinge line, ventral muscle field varying from elongate to transverse, musclebounding ridges absent except in few gerontic individuals, cardinal process lobes massive, wide, joined at their base to form U-shaped structure, projecting posterior to hinge line, socket ridges small, thin, widely divergent, elevated dorsal muscle field with strong bounding ridges, small central dorsal septum, two very short dorsal side septa.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Strophodontidae
Formal Genus Name and Reference:
Megastrophia CASTER, 1939, p. 37
Type Species:
Stropheodonta concava HALL, 1857, p. 140, OD
Images
(Click to enlarge in a new window)
Fig. 189, $1 a-e .*$ M. concava (Hall), Givetian, $a, b$, ventral, lateral views of conjoined valves, Hamilton Group, York, AMNH 37197, XI, $c$, ventral interior, Hamilton Group, Canandaigua Lake, AMNH 37196, x1$, d, dorsal interior, Hamilton Group, Darien, New York, BMNH B 9580, X1, e, partial dorsal interior showing cardinal process, Silica Shale, Travers Group, Sylvania, Ohio, BMNH BB 16709, X1.5 (new)."
Synonyms
Geographic Distribution
North America, Asia (Altai-Sayan)
Age Range
Beginning Stage in Treatise Usage:
Devonian (Emsian)
Beginning International Stage:
Emsian
Fraction Up In Beginning Stage:
0
Beginning Date:
410.51
Ending Stage in Treatise Usage:
Devonian (Givetian)
Ending International Stage:
Givetian
Fraction Up In Ending Stage:
100
Ending Date:
378.9
Description
Large shells, with strongly concavoconvex profile, ornament costellate to unequally parvicostellate, denticulate along two-thirds of hinge line, ventral muscle field varying from elongate to transverse, musclebounding ridges absent except in few gerontic individuals, cardinal process lobes massive, wide, joined at their base to form U-shaped structure, projecting posterior to hinge line, socket ridges small, thin, widely divergent, elevated dorsal muscle field with strong bounding ridges, small central dorsal septum, two very short dorsal side septa.