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Plebejochonetes
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Chonetoidea
Family:
Chonetidae
Formal Genus Name and Reference:
Plebejochonetes Boucot & HARPER, 1968, p. 159
Type Species:
Chonetes plebeja SCHNUR, 1854, p. 226, OD
Images
(Click to enlarge in a new window)
Fig. 256, 3a-d. P. semiradiatus (Sowerby), Emsian, Rhenish Slate Mountains, $a, b$, ventral valve exterior, lateral profile, $c$, ventral valve internal mold, $d$, dorsal valve external mold, x2$ (Boucot & Harper, 1968).
Synonyms
Geographic Distribution
Europe
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Pragian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Resembles Chonetes, but shell usually smaller, more strongly concavoconvex, radial ornamentation of costellae or costae, posterolateral costae crossing posterior margin of valves, spines orthomorph oblique, symmetrically arranged, ventral valve interior with short myophragm, anteriorly rounded teeth, dorsal valve with short median septum, cardinal process pit developed in oldest representatives, cardinal process deeply bilobed internally, several pairs of ill-defined accessory septa in oldest forms, one pair of bladelike accessory septa in last representatives.
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Strophomenata
Order:
Productida
Superfamily:
Chonetoidea
Family:
Chonetidae
Formal Genus Name and Reference:
Plebejochonetes Boucot & HARPER, 1968, p. 159
Type Species:
Chonetes plebeja SCHNUR, 1854, p. 226, OD
Images
(Click to enlarge in a new window)
Fig. 256, 3a-d. P. semiradiatus (Sowerby), Emsian, Rhenish Slate Mountains, $a, b$, ventral valve exterior, lateral profile, $c$, ventral valve internal mold, $d$, dorsal valve external mold, x2$ (Boucot & Harper, 1968).
Synonyms
Geographic Distribution
Europe
Age Range
Beginning Stage in Treatise Usage:
Lower Devonian (Pragian)
Beginning International Stage:
Pragian
Fraction Up In Beginning Stage:
0
Beginning Date:
412.4
Ending Stage in Treatise Usage:
Lower Devonian (Emsian)
Ending International Stage:
Emsian
Fraction Up In Ending Stage:
100
Ending Date:
394.3
Description
Resembles Chonetes, but shell usually smaller, more strongly concavoconvex, radial ornamentation of costellae or costae, posterolateral costae crossing posterior margin of valves, spines orthomorph oblique, symmetrically arranged, ventral valve interior with short myophragm, anteriorly rounded teeth, dorsal valve with short median septum, cardinal process pit developed in oldest representatives, cardinal process deeply bilobed internally, several pairs of ill-defined accessory septa in oldest forms, one pair of bladelike accessory septa in last representatives.