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Gymnograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Dicranograptidae
Formal Genus Name and Reference:
Gymnograptus BULMAN, 1953 (ex Tullberg, manuscript), p. 514
Type Species:
*Diplograptus linnarssoni MOBERG, 1896, p. 17, OD
Images
(Click to enlarge in a new window)
Fig. 248,3a-d. *G. linnarssoni (MOBERG), 3a, syntype, Fågelsång, Scania, Sweden (Moberg, 1896, fig. b), 3b-3d, isolated specimens in reverse (d) and obverse (b) views, distal fragment ( c ), glacial boulder, Poland (Urbanek, 1959, fig. 4, 5, and 9, respectively). Scale bars, 1 mm.
Synonyms
Diplograptus, Idiograptus
Geographic Distribution
China, Sweden, Norway, Spain
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (upper Darriwilian, Jiangxigraptus vagus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
463.8
Ending Stage in Treatise Usage:
Upper Ordovician (Sandbian, Nemagraptus gracilis Biozone)
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
0
Ending Date:
452.75
Description
Neograptines with attenuated fusellum and thickened thecal lists, proximal end of pattern G astogeny, single antivirgellar spine and virgella bending outward from sicular aperture, distinct geniculum with short supragenicular wall and variably developed extensions developed as paired or multiple spines, median septum complete
References
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Dicranograptidae
Formal Genus Name and Reference:
Gymnograptus BULMAN, 1953 (ex Tullberg, manuscript), p. 514
Type Species:
*Diplograptus linnarssoni MOBERG, 1896, p. 17, OD
Images
(Click to enlarge in a new window)
Fig. 248,3a-d. *G. linnarssoni (MOBERG), 3a, syntype, Fågelsång, Scania, Sweden (Moberg, 1896, fig. b), 3b-3d, isolated specimens in reverse (d) and obverse (b) views, distal fragment ( c ), glacial boulder, Poland (Urbanek, 1959, fig. 4, 5, and 9, respectively). Scale bars, 1 mm.
Synonyms
Diplograptus, Idiograptus
Geographic Distribution
China, Sweden, Norway, Spain
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (upper Darriwilian, Jiangxigraptus vagus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
463.8
Ending Stage in Treatise Usage:
Upper Ordovician (Sandbian, Nemagraptus gracilis Biozone)
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
0
Ending Date:
452.75
Description
Neograptines with attenuated fusellum and thickened thecal lists, proximal end of pattern G astogeny, single antivirgellar spine and virgella bending outward from sicular aperture, distinct geniculum with short supragenicular wall and variably developed extensions developed as paired or multiple spines, median septum complete