Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Didymograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Didymograptidae
Formal Genus Name and Reference:
Didymograptus M‘Coy, 1851 in Sedgwick & M‘COY, 1851-1854, p. 9
Type Species:
*Graptolithus murchisoni Beck in Murchison, 1839, p. 694, SD MILLER, 1889, p. 185
Images
(Click to enlarge in a new window)
Fig. 197,1e. Didymograptus sp., NHMUK PM Q49, holotype of Trigonograpsus lanceolatus, scale bar, 1 mm (Jackson & Bulman, 1970, fig. 1), Fig. 197,1a. D. murchisoni (Веск in Murchison), lectotype (selected by Elles & Wood, 1901, p. 40), BGS GSM 6820b, Gelli, near Llandrindod, Wales, UK, scale bar, 1 mm (Strachan & Kashogji, 1984, fig. 7), ——Fig.197, 1 b-d. D. artus (Elles & Wood, 1901), 1b, CPC 7010, isolated proximal fragment showing artustype development, Canning Basin, Willara 1 drill core, Australia, scale bar, 0.5 mm (Skwarko, 1968, fig. 2), 1 c-d, D. erraticus, holotype, ZPAL G./III, complete specimen (d) and proximal end (c) showing fuselli, Poland, scale bars 1 mm (1c), 0.5 mm (1d) (Kozłowski, 1954, fig. 9)
Synonyms
Cladograpsus, Parazygograptus, Trigonograpsus
Geographic Distribution
Belgium, UK, Czech Republic, France, Germany, Norway, Spain, Sweden, China, North Africa, Saudi Arabia, western Australia, Bolivia, Colombia, Peru
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Didymograptus artus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
469.42
Ending Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Pseudamplexograptus distichus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
458.18
Description
Pendent didymograptid with low metasicular origin of th $1^{1}$ and artus-type proximal development, stipes slender or distinctly widening distally, proximal end usually covered by cortical overgrowth in gerontic specimens
References
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Didymograptidae
Formal Genus Name and Reference:
Didymograptus M‘Coy, 1851 in Sedgwick & M‘COY, 1851-1854, p. 9
Type Species:
*Graptolithus murchisoni Beck in Murchison, 1839, p. 694, SD MILLER, 1889, p. 185
Images
(Click to enlarge in a new window)
Fig. 197,1e. Didymograptus sp., NHMUK PM Q49, holotype of Trigonograpsus lanceolatus, scale bar, 1 mm (Jackson & Bulman, 1970, fig. 1), Fig. 197,1a. D. murchisoni (Веск in Murchison), lectotype (selected by Elles & Wood, 1901, p. 40), BGS GSM 6820b, Gelli, near Llandrindod, Wales, UK, scale bar, 1 mm (Strachan & Kashogji, 1984, fig. 7), ——Fig.197, 1 b-d. D. artus (Elles & Wood, 1901), 1b, CPC 7010, isolated proximal fragment showing artustype development, Canning Basin, Willara 1 drill core, Australia, scale bar, 0.5 mm (Skwarko, 1968, fig. 2), 1 c-d, D. erraticus, holotype, ZPAL G./III, complete specimen (d) and proximal end (c) showing fuselli, Poland, scale bars 1 mm (1c), 0.5 mm (1d) (Kozłowski, 1954, fig. 9)
Synonyms
Cladograpsus, Parazygograptus, Trigonograpsus
Geographic Distribution
Belgium, UK, Czech Republic, France, Germany, Norway, Spain, Sweden, China, North Africa, Saudi Arabia, western Australia, Bolivia, Colombia, Peru
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Didymograptus artus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
469.42
Ending Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Pseudamplexograptus distichus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
458.18
Description
Pendent didymograptid with low metasicular origin of th $1^{1}$ and artus-type proximal development, stipes slender or distinctly widening distally, proximal end usually covered by cortical overgrowth in gerontic specimens