Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Isograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Isograptidae
Formal Genus Name and Reference:
Isograptus MOBERG, 1892a, p. 345
Type Species:
*Didymograptus gibberulus Nicholson 1875, p. 271, M
Images
(Click to enlarge in a new window)
Fig. 209,1a. * I. gibberulus (Nicholson), lectotype, SM A17779, Randal Craig, Skiddaw, Cumbria (English Lake District), UK, scale bar, 1 mm (Rushton, 2000c, Atlas, Folio 1.34), ——Fig. 209,1b. I. spjeldnaesi Maletz, 2011a, holotype, T878-1, left-handed specimen, scale bar, 1 mm (Maletz, 2011a, fig. 6A), ——Fig. 209, 1c. I. mobergi Maletz, 2011a, holotype, SGU 5249, scale bar, 1 mm (Maletz, 2011a, fig. 6)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (lower Dapingian, Isograptus lunatus Biozone)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Levisograptus austrodentatus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
458.18
Description
Reclined, two-stiped isograptids, thecae simple with rutellate apertures, shorter and wider thecae in earlier species with thecal length increasing in later species, proximal development type isograptid, dextral, with low prosicular origin of th $1^{1}$, rarely sinistral
References
Moberg, J. C. 1892a. Om några nya graptoliter från Skånes Undre graptolitskiffer. Geologiska Föreningens i Stockholm Förhandlingar 14(4):339-350.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Isograptidae
Formal Genus Name and Reference:
Isograptus MOBERG, 1892a, p. 345
Type Species:
*Didymograptus gibberulus Nicholson 1875, p. 271, M
Images
(Click to enlarge in a new window)
Fig. 209,1a. * I. gibberulus (Nicholson), lectotype, SM A17779, Randal Craig, Skiddaw, Cumbria (English Lake District), UK, scale bar, 1 mm (Rushton, 2000c, Atlas, Folio 1.34), ——Fig. 209,1b. I. spjeldnaesi Maletz, 2011a, holotype, T878-1, left-handed specimen, scale bar, 1 mm (Maletz, 2011a, fig. 6A), ——Fig. 209, 1c. I. mobergi Maletz, 2011a, holotype, SGU 5249, scale bar, 1 mm (Maletz, 2011a, fig. 6)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (lower Dapingian, Isograptus lunatus Biozone)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Levisograptus austrodentatus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
458.18
Description
Reclined, two-stiped isograptids, thecae simple with rutellate apertures, shorter and wider thecae in earlier species with thecal length increasing in later species, proximal development type isograptid, dextral, with low prosicular origin of th $1^{1}$, rarely sinistral
References
Moberg, J. C. 1892a. Om några nya graptoliter från Skånes Undre graptolitskiffer. Geologiska Föreningens i Stockholm Förhandlingar 14(4):339-350.