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Staurograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Anisograptidae
Formal Genus Name and Reference:
Staurograptus EMMONS, 1855, p. 108
Type Species:
*S. dichotomus, M
Images
(Click to enlarge in a new window)
Fig. 161,2a. * S. dichotomous, type specimen whereabouts unknown, scale bar, 5 mm (Feng, Erdtmann, & Zhang, 2005, p. 1013), -_ Fig. 161,2b. S. hyperboreus (Obut & Sobolevskaya, 1962), holotype, CGMSP 8310/11, scale bar, 5 mm (Feng, Erdtmann, & Zhang, 2005, fig. 11C)
Synonyms
Aletograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (lower Tremadocian, Rhabdinopora proparabola Biozone)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Lower Ordovician (lower Tremadocian, Rhabdinopora campanulatum Biozone)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
481.96
Description
Quadriradiate anisograptid with horizontal to subhorizontal, multiramous to pauciramous tubarium, distal dichotomies irregularly spaced, dissepiments rare and scattered distally in some mature and gerontic specimens of early species, otherwise lacking altogether
References
Emmons, Ebenezer. 1855. American Geology, Containing a Statement of the Principles of the Science, with Full Illustrations of the Characteristic American Fossils, Also an Atlas and a Geological Map of the United States. Part 2. The Taconic System. J. Munsell. Albany. 251 p., 18 pl.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Anisograptidae
Formal Genus Name and Reference:
Staurograptus EMMONS, 1855, p. 108
Type Species:
*S. dichotomus, M
Images
(Click to enlarge in a new window)
Fig. 161,2a. * S. dichotomous, type specimen whereabouts unknown, scale bar, 5 mm (Feng, Erdtmann, & Zhang, 2005, p. 1013), -_ Fig. 161,2b. S. hyperboreus (Obut & Sobolevskaya, 1962), holotype, CGMSP 8310/11, scale bar, 5 mm (Feng, Erdtmann, & Zhang, 2005, fig. 11C)
Synonyms
Aletograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (lower Tremadocian, Rhabdinopora proparabola Biozone)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Lower Ordovician (lower Tremadocian, Rhabdinopora campanulatum Biozone)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
481.96
Description
Quadriradiate anisograptid with horizontal to subhorizontal, multiramous to pauciramous tubarium, distal dichotomies irregularly spaced, dissepiments rare and scattered distally in some mature and gerontic specimens of early species, otherwise lacking altogether
References
Emmons, Ebenezer. 1855. American Geology, Containing a Statement of the Principles of the Science, with Full Illustrations of the Characteristic American Fossils, Also an Atlas and a Geological Map of the United States. Part 2. The Taconic System. J. Munsell. Albany. 251 p., 18 pl.