Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Obolella
Classification
Phylum:
Brachiopoda
Class:
Obolellata
Order:
Obolellida
Superfamily:
Obolelloidea
Family:
Obolellidae
Formal Genus Name and Reference:
Obolella BILLINGS, 1861b, p. 6
Type Species:
O. chromatica, SD DALL, 1870, p. 163
Images
(Click to enlarge in a new window)
Fig. 120, 2ac. * O. chromatica, Labrador, Canada, $a$, ventral valve interior, GSC 395i, X4.2 (new), b, dorsal valve exterior, USNM 14891c, x3.3$ (Rowell, 1962a), $c$, dorsal interior, GSC 395m, X4.2 (new).
Synonyms
Geographic Distribution
USA, Canada, Greenland, Russia (Siberia, Altai), ?Norway, China, Spain, Australia
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (Atdabanian)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Lower Cambrian (?Botomian)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
25
Ending Date:
513.13
Description
Shell weakly biconvex, subcircular or elongate oval, ornament of fine striae, lamellose peripherally, ventral interarea low, narrow, apsacline to catacline, ventral beak marginal, dorsal interarea low, orthocline, ventral visceral field forming low, solid platform, bisected by shallow median groove
References
Museum or Author Information
Classification
Phylum:
Brachiopoda
Class:
Obolellata
Order:
Obolellida
Superfamily:
Obolelloidea
Family:
Obolellidae
Formal Genus Name and Reference:
Obolella BILLINGS, 1861b, p. 6
Type Species:
O. chromatica, SD DALL, 1870, p. 163
Images
(Click to enlarge in a new window)
Fig. 120, 2ac. * O. chromatica, Labrador, Canada, $a$, ventral valve interior, GSC 395i, X4.2 (new), b, dorsal valve exterior, USNM 14891c, x3.3$ (Rowell, 1962a), $c$, dorsal interior, GSC 395m, X4.2 (new).
Synonyms
Geographic Distribution
USA, Canada, Greenland, Russia (Siberia, Altai), ?Norway, China, Spain, Australia
Age Range
Beginning Stage in Treatise Usage:
Lower Cambrian (Atdabanian)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Lower Cambrian (?Botomian)
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
25
Ending Date:
513.13
Description
Shell weakly biconvex, subcircular or elongate oval, ornament of fine striae, lamellose peripherally, ventral interarea low, narrow, apsacline to catacline, ventral beak marginal, dorsal interarea low, orthocline, ventral visceral field forming low, solid platform, bisected by shallow median groove