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Hedrograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Axonophora
Infraorder:
Neograptina
Family:
Neograptina - Uncertain taxa
Formal Genus Name and Reference:
Hedrograptus OBUT, 1949, p. 13
Type Species:
*H. janischewskyi, OD
Images
(Click to enlarge in a new window)
_Fig. 254,1. * H. janischewskyi, holotype, I.G.G.-COAH-SSSP No. 278/5, 1945, drawing from latex cast, scale bar, 10 mm (Riva, 1988, fig. 6).
Synonyms
Geographic Distribution
Russia
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian-?Aeronian)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian-?Aeronian)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
early Silurian climacograptids with insignificant or incomplete apertural excavations on one side of the rhabdosome and complete on the other, lacks proximal spines except for the virgella, has a pointed proximal end indicating normalograptid relationship
References
Obut, A. M. 1949. Polevoi atlas rukovodyashchikh graptolitov verkhnego silura Kirgizskoi SSR. [Field Atlas of leading graptolites of the Upper Silurian of Kirgiz SSR.] Akademia. Nauk SSSR, Kirgiz. Filial, Geologii Institut. Frunze. 56 p. 7 pl. In Russian.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Axonophora
Infraorder:
Neograptina
Family:
Neograptina - Uncertain taxa
Formal Genus Name and Reference:
Hedrograptus OBUT, 1949, p. 13
Type Species:
*H. janischewskyi, OD
Images
(Click to enlarge in a new window)
_Fig. 254,1. * H. janischewskyi, holotype, I.G.G.-COAH-SSSP No. 278/5, 1945, drawing from latex cast, scale bar, 10 mm (Riva, 1988, fig. 6).
Synonyms
Geographic Distribution
Russia
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian-?Aeronian)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian-?Aeronian)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
100
Ending Date:
438.59
Description
early Silurian climacograptids with insignificant or incomplete apertural excavations on one side of the rhabdosome and complete on the other, lacks proximal spines except for the virgella, has a pointed proximal end indicating normalograptid relationship
References
Obut, A. M. 1949. Polevoi atlas rukovodyashchikh graptolitov verkhnego silura Kirgizskoi SSR. [Field Atlas of leading graptolites of the Upper Silurian of Kirgiz SSR.] Akademia. Nauk SSSR, Kirgiz. Filial, Geologii Institut. Frunze. 56 p. 7 pl. In Russian.