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Mesoleptostrophia
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Leptostrophiidae
Formal Genus Name and Reference:
Mesoleptostrophia Harper & Boucot, 1978, p. 68
Type Species:
* M. kartalensis, OD
Images
(Click to enlarge in a new window)
Fig. 1734, 2a-d. * M? (R.) sowerbyi (Barrande), a, ventral exterior, Konĕprusy Limestone, Konĕprusy, NM L6673, x1.5, b-c, holotype, dorsal view of conjoined valves, Koněprusy Limestone, Koněprusy, NM L6457, x1.5 and x3, d, dorsal internal mold, Zlíchov Limestone, Hlubočepy, VH 438, ×4 (Havliček & Vanĕk, 1998).
Synonyms
Leptostrophiella, Mitchellella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Silurian (Telychian)
Beginning International Stage:
Telychian
Fraction Up In Beginning Stage:
0
Beginning Date:
438.59
Ending Stage in Treatise Usage:
Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
Outline semicircular to subquadrate, profile biplanate to gently concavoconvex, ornament unequally parvicostellate to uniformly costellate, denticulate over most of valve width, small ventral process present, subtriangular to bilobed ventral muscle field with bounding ridges variably developed posterolaterally, variable, usually small, cardinal process lobes. [See Cocks & Rong , 2000, p. 286. There are already two subgenera, Mesoleptostrophia and Paraleptostrophia, within Mesoleptostrophia. It is uncertain whether or not Rhytirugea should be included within the genus, and, if so, what its relationships with the other subgenera are. It was erected as a subgenus of Leptostrophiella , which was synonymized within Mesoleptostrophia in cocks & rong, 2000, p. 286; however, it may be a synonym of Paraleptostrophia, but the characteristic cardinal process lobes of that subgenus are not described for Rhytirugea. The type species was previously assigned to Rhytistrophia by Havlíček, 1967. ]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Subphylum:
Rhynchonelliformea
Class:
Strophomenata
Order:
Strophomenida
Superfamily:
Strophomenoidea
Family:
Leptostrophiidae
Formal Genus Name and Reference:
Mesoleptostrophia Harper & Boucot, 1978, p. 68
Type Species:
* M. kartalensis, OD
Images
(Click to enlarge in a new window)
Fig. 1734, 2a-d. * M? (R.) sowerbyi (Barrande), a, ventral exterior, Konĕprusy Limestone, Konĕprusy, NM L6673, x1.5, b-c, holotype, dorsal view of conjoined valves, Koněprusy Limestone, Koněprusy, NM L6457, x1.5 and x3, d, dorsal internal mold, Zlíchov Limestone, Hlubočepy, VH 438, ×4 (Havliček & Vanĕk, 1998).
Synonyms
Leptostrophiella, Mitchellella
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Silurian (Telychian)
Beginning International Stage:
Telychian
Fraction Up In Beginning Stage:
0
Beginning Date:
438.59
Ending Stage in Treatise Usage:
Devonian (Eifelian)
Ending International Stage:
Eifelian
Fraction Up In Ending Stage:
100
Ending Date:
385.3
Description
Outline semicircular to subquadrate, profile biplanate to gently concavoconvex, ornament unequally parvicostellate to uniformly costellate, denticulate over most of valve width, small ventral process present, subtriangular to bilobed ventral muscle field with bounding ridges variably developed posterolaterally, variable, usually small, cardinal process lobes. [See Cocks & Rong , 2000, p. 286. There are already two subgenera, Mesoleptostrophia and Paraleptostrophia, within Mesoleptostrophia. It is uncertain whether or not Rhytirugea should be included within the genus, and, if so, what its relationships with the other subgenera are. It was erected as a subgenus of Leptostrophiella , which was synonymized within Mesoleptostrophia in cocks & rong, 2000, p. 286; however, it may be a synonym of Paraleptostrophia, but the characteristic cardinal process lobes of that subgenus are not described for Rhytirugea. The type species was previously assigned to Rhytistrophia by Havlíček, 1967. ]