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Dicellograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Dicranograptidae
Formal Genus Name and Reference:
Dicellograptus HOPKINSON, 1871, p. 20
Type Species:
*Didymograpsus elegans Carruthers, 1867b, p. 369, SD GURLEY, 1896, p. 70
Images
(Click to enlarge in a new window)
Fig. 242,2a. *D. elegans (Carruthers), holotype, NHMUK Q850, Lower Hartfell Shale, Pleurograptus linearis Zone, Dob's Linn, Scotland, UK, scale bar, 10 mm (Elles & Wood, 1904, pl. 23,2a), ——Fig. 242,2b. D. flaccidus (Hall), GSC 1957b, proximal end, Lake St. John's, east from Blue Point, Utica Shale, Canada, scale bar, 1 mm (new, drawing by John F. Riva), ——FIG. 242,2c-e. Dicellograptus complanatus (Lapworth, 1880a), 2c, PMU 22496, proximal end in reverse view, 2 d, PMU 22498, proximal thecae, 2e, PMU 22499, distal thecae, Fjäcka Shale, Bestorp, Västergötland, Sweden, scale bars, 1 mm (Skoglund, 1963, fig. 10B-D)
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 (Hirnantian, Metabolograptus persculptus Biozone)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Two-stiped dicranograptids with reclined, straight to spirally coiled stipes, proximal end of pattern $A^{\prime}$ astogeny with sicula vertical and free between stipes, geniculate thecae with or without intrathecal folds and introverted and isolated apertures, at least first thecal pair with mesial to subapertural spines, J-shaped th $1^{1}$ and th $1^{2}$
References
Hopkinson, J. 1871. On Dicellograptus, a new genus of graptolites. Geological Magazine 8:20-26.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Dicranograptidae
Formal Genus Name and Reference:
Dicellograptus HOPKINSON, 1871, p. 20
Type Species:
*Didymograpsus elegans Carruthers, 1867b, p. 369, SD GURLEY, 1896, p. 70
Images
(Click to enlarge in a new window)
Fig. 242,2a. *D. elegans (Carruthers), holotype, NHMUK Q850, Lower Hartfell Shale, Pleurograptus linearis Zone, Dob's Linn, Scotland, UK, scale bar, 10 mm (Elles & Wood, 1904, pl. 23,2a), ——Fig. 242,2b. D. flaccidus (Hall), GSC 1957b, proximal end, Lake St. John's, east from Blue Point, Utica Shale, Canada, scale bar, 1 mm (new, drawing by John F. Riva), ——FIG. 242,2c-e. Dicellograptus complanatus (Lapworth, 1880a), 2c, PMU 22496, proximal end in reverse view, 2 d, PMU 22498, proximal thecae, 2e, PMU 22499, distal thecae, Fjäcka Shale, Bestorp, Västergötland, Sweden, scale bars, 1 mm (Skoglund, 1963, fig. 10B-D)
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 (Hirnantian, Metabolograptus persculptus Biozone)
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
0
Ending Date:
443.07
Description
Two-stiped dicranograptids with reclined, straight to spirally coiled stipes, proximal end of pattern $A^{\prime}$ astogeny with sicula vertical and free between stipes, geniculate thecae with or without intrathecal folds and introverted and isolated apertures, at least first thecal pair with mesial to subapertural spines, J-shaped th $1^{1}$ and th $1^{2}$
References
Hopkinson, J. 1871. On Dicellograptus, a new genus of graptolites. Geological Magazine 8:20-26.