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Azygograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Sigmargraptidae
Formal Genus Name and Reference:
Azygograptus Nicholson & Lapworth in NICHOLSON, 1875, p. 269
Type Species:
*A. lapworthi, OD
Images
(Click to enlarge in a new window)
Fig. 171,2a-b. A. suecicus, 2 a, lectotype, SGU 5247, 2 b, paratype, SGU 5248, Killeröd, Scania, Sweden, scale bars, 1 mm (Moberg, 1892a, pl. 8,1 and 8,2, respectively), ——Fig. 171,2c. *A. lapworthi, NIGP 32222, southwest China, scale bar, 1 mm (on slab with Mu & others, 1979, pl. 38,11)
Synonyms
Eoazygograptus, Metazygograptus
Geographic Distribution
China, Czech Republic, UK, Germany, Norway, Spain, Sweden, Canada, Argentina, Bolivia
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (upper Floian, Tetragraptus phyllograptoides Biozone)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
474.17
Ending Stage in Treatise Usage:
Middle Ordovician (lower Darriwilian, Levisograptus austrodentatus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
463.8
Description
Singlestiped tubarium, th $1^{1}$ originating from metasicula, growing downward first or immediately outward from lower part of metasicula, stipe either straight or dorsally curved, sicula straight to slightly curved, moderate widening toward aperture, thecae simple, elongate, and inclined at low angle to the dorsal margin and with low thecal overlap, prothecal folds in one species
References
Nicholson, H. A. 1875. On a new genus and some new species of graptolites from the Skiddaw Slates. Annals and Magazine of Natural Natural History, (series 4) 16:269-273.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Sigmargraptidae
Formal Genus Name and Reference:
Azygograptus Nicholson & Lapworth in NICHOLSON, 1875, p. 269
Type Species:
*A. lapworthi, OD
Images
(Click to enlarge in a new window)
Fig. 171,2a-b. A. suecicus, 2 a, lectotype, SGU 5247, 2 b, paratype, SGU 5248, Killeröd, Scania, Sweden, scale bars, 1 mm (Moberg, 1892a, pl. 8,1 and 8,2, respectively), ——Fig. 171,2c. *A. lapworthi, NIGP 32222, southwest China, scale bar, 1 mm (on slab with Mu & others, 1979, pl. 38,11)
Synonyms
Eoazygograptus, Metazygograptus
Geographic Distribution
China, Czech Republic, UK, Germany, Norway, Spain, Sweden, Canada, Argentina, Bolivia
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (upper Floian, Tetragraptus phyllograptoides Biozone)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
474.17
Ending Stage in Treatise Usage:
Middle Ordovician (lower Darriwilian, Levisograptus austrodentatus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
463.8
Description
Singlestiped tubarium, th $1^{1}$ originating from metasicula, growing downward first or immediately outward from lower part of metasicula, stipe either straight or dorsally curved, sicula straight to slightly curved, moderate widening toward aperture, thecae simple, elongate, and inclined at low angle to the dorsal margin and with low thecal overlap, prothecal folds in one species
References
Nicholson, H. A. 1875. On a new genus and some new species of graptolites from the Skiddaw Slates. Annals and Magazine of Natural Natural History, (series 4) 16:269-273.