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Protozyga
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Protozygoidea
Family:
Protozygidae
Formal Genus Name and Reference:
Protozyga Hall in Hall & CLARKE, 1893, p. 141
Type Species:
Atrypa exigua HALL, 1847, p. 141, OD
Images
(Click to enlarge in a new window)
Fig. 999, 3a-i. *P. exigua (Hall), lower Caradoc, New York, USA, $a-e$, dorsal, ventral, lateral, anterior, posterior views, x5, f-g$, serial sections, x5$ (Copper, 1986b), $b-i$, dorsal, lateral reconstruction of brachidium, x10$ (new).
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Ordovician (Caradoc)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
Small, rounded, normally smooth or slightly corrugate anteriorly, planoconvex-ventribiconvex, small, anacline-hypercline area, minute apical foramen, deltidial plates minute or absent, sulcate commissure, thin shell wall, teeth with large dental cavities, small cardinalia, crura delicate, ventrolateral, medially to mediodorsally directed spiralia, usually fewer than 3 whorls, ventrocentral, U-shaped jugum. [Differs from Manespira in spiralia of multiple whorls, complete jugum, posterior absence of corrugations.]
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Atrypida
Superfamily:
Protozygoidea
Family:
Protozygidae
Formal Genus Name and Reference:
Protozyga Hall in Hall & CLARKE, 1893, p. 141
Type Species:
Atrypa exigua HALL, 1847, p. 141, OD
Images
(Click to enlarge in a new window)
Fig. 999, 3a-i. *P. exigua (Hall), lower Caradoc, New York, USA, $a-e$, dorsal, ventral, lateral, anterior, posterior views, x5, f-g$, serial sections, x5$ (Copper, 1986b), $b-i$, dorsal, lateral reconstruction of brachidium, x10$ (new).
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Ordovician (Caradoc)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Ordovician (Caradoc)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
66.7
Ending Date:
447.72
Description
Small, rounded, normally smooth or slightly corrugate anteriorly, planoconvex-ventribiconvex, small, anacline-hypercline area, minute apical foramen, deltidial plates minute or absent, sulcate commissure, thin shell wall, teeth with large dental cavities, small cardinalia, crura delicate, ventrolateral, medially to mediodorsally directed spiralia, usually fewer than 3 whorls, ventrocentral, U-shaped jugum. [Differs from Manespira in spiralia of multiple whorls, complete jugum, posterior absence of corrugations.]