Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Dicranograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Dicranograptidae
Formal Genus Name and Reference:
Dicranograptus HALL, 1865, p. 112
Type Species:
*Graptolithus ramosus HALL, 1847, p. 270, OD
Images
(Click to enlarge in a new window)
Fig. 242,5a-b. *D. ramosus (Hall), 5 a, AMNH 30440, syntype (new, photo by Dan Goldman), 5b, AMNH 30440, proximal end of syntype showing spines (new, drawing by John F. Riva). Scale bars, 1 mm
Synonyms
Geographic Distribution
worldwide
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 (Katian, Paraorthograptus pacificus Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Initially biserial and distally two-stiped dicranograptid with reclined, commonly spirally coiled stipes, proximal end of pattern $A^{\prime}$ astogeny, thecae with intrathecal folds and geniculum, thecal apertures introverted and with apertural isolation, thecae with mesial to subapertural spines, at least in proximal end
References
Hall, James. 1865. Figures and descriptions of Canadian organic remains. Decade II, Graptolites of the Quebec Group. Geological Survey of Canada. Dawson Brothers. Montreal. 154 p. 21 pl.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Dicranograptidae
Formal Genus Name and Reference:
Dicranograptus HALL, 1865, p. 112
Type Species:
*Graptolithus ramosus HALL, 1847, p. 270, OD
Images
(Click to enlarge in a new window)
Fig. 242,5a-b. *D. ramosus (Hall), 5 a, AMNH 30440, syntype (new, photo by Dan Goldman), 5b, AMNH 30440, proximal end of syntype showing spines (new, drawing by John F. Riva). Scale bars, 1 mm
Synonyms
Geographic Distribution
worldwide
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 (Katian, Paraorthograptus pacificus Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Initially biserial and distally two-stiped dicranograptid with reclined, commonly spirally coiled stipes, proximal end of pattern $A^{\prime}$ astogeny, thecae with intrathecal folds and geniculum, thecal apertures introverted and with apertural isolation, thecae with mesial to subapertural spines, at least in proximal end
References
Hall, James. 1865. Figures and descriptions of Canadian organic remains. Decade II, Graptolites of the Quebec Group. Geological Survey of Canada. Dawson Brothers. Montreal. 154 p. 21 pl.