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Orthograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Diplograptidae
Formal Genus Name and Reference:
Orthograptus Lapworth, 1873b, Table 1, opposite p. 555, ex subgenus Diplograptus (Orthograptus) LAPWORTH, 1873b, Table 1, opposite p. 555
Type Species:
*Graptolithus quadrimucronatus Hall 1865, p. 144, OD
Images
(Click to enlarge in a new window)
Fig. 231,6a-c. *O. quadrimucronatus (Hall), 6a, syntype, GSC 1898a, Lake St. John, Quebec, Canada (Hall, 1865, pl. 13, 1), 6 b-c, MCZ 9472/5, isolated specimen in reverse (c) and obverse (b) views showing delay of median septum (adapted from Mitchell, 1987, fig. 9G-H). Scale bars, 1 mm, _Fig. 231,6d. O. apiculatus (Elles & Wood, 1907), Laggan Burn, Scotland, scale bar, 1 mm (Bulman, 1946, pl. 6,2)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Sandbian, Nemagraptus gracilis Biozone)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (Katian, Pleurograptus linearis Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Peiragraptines with proximally rounded to strongly asymmetrical tubarium and apertural spines on the first thecal pair, median septum delayed, proximal development of pattern G astogeny, thecae with straight to slightly sigmoidal ventral walls, thecal apertures generally bearing paired spines or horns, rarely unadorned, fusellum may be attenuated
References
Lapworth, Charles. 1873b. Notes on the British graptolites and their allies. 1. On an improved classification of the Rhabdophora, Part 2. Geological Magazine 10:555-560, 1 table (facing p. 555).
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Diplograptidae
Formal Genus Name and Reference:
Orthograptus Lapworth, 1873b, Table 1, opposite p. 555, ex subgenus Diplograptus (Orthograptus) LAPWORTH, 1873b, Table 1, opposite p. 555
Type Species:
*Graptolithus quadrimucronatus Hall 1865, p. 144, OD
Images
(Click to enlarge in a new window)
Fig. 231,6a-c. *O. quadrimucronatus (Hall), 6a, syntype, GSC 1898a, Lake St. John, Quebec, Canada (Hall, 1865, pl. 13, 1), 6 b-c, MCZ 9472/5, isolated specimen in reverse (c) and obverse (b) views showing delay of median septum (adapted from Mitchell, 1987, fig. 9G-H). Scale bars, 1 mm, _Fig. 231,6d. O. apiculatus (Elles & Wood, 1907), Laggan Burn, Scotland, scale bar, 1 mm (Bulman, 1946, pl. 6,2)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Sandbian, Nemagraptus gracilis Biozone)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (Katian, Pleurograptus linearis Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Peiragraptines with proximally rounded to strongly asymmetrical tubarium and apertural spines on the first thecal pair, median septum delayed, proximal development of pattern G astogeny, thecae with straight to slightly sigmoidal ventral walls, thecal apertures generally bearing paired spines or horns, rarely unadorned, fusellum may be attenuated
References
Lapworth, Charles. 1873b. Notes on the British graptolites and their allies. 1. On an improved classification of the Rhabdophora, Part 2. Geological Magazine 10:555-560, 1 table (facing p. 555).