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Psigraptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Anisograptidae
Formal Genus Name and Reference:
Psigraptus JACKSON, 1967, p. 314
Type Species:
*P. arcticus, OD
Images
(Click to enlarge in a new window)
Fig. 164,3a. P. arcticus, holotype, GSC 21248, scale bar, 1 mm (new), Fig. 164,3b. P. lenzi (JACKSON), holotype, GSC 21253, scale bar, 1 mm (new), Fig. 164,3c. P. hunjiangensis (ZHAO & ZHANG), holotype, scale bar, 1 mm (new), Fig. 164,3d. P. reclinatus (Zhao & Zhang), holotype, scale bar, 1 mm (new), ——Fig. 164,3 e. P. typicus (Zhao & Zhang), holotype, scale bar, 1 mm (new), ——Fig. 164,3f. P. sinicus (Zнао & Zhang), holotype, scale bar, 1 mm (new)
Synonyms
Yukonograptus, Muenzhigraptus, Diphygraptus, Hunjiangograptus, Holopsigraptus, Clonograptus, Neoclonograptus
Geographic Distribution
Australia, China, South Korea, Canada
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (upper Tremadocian, Psigraptus Biozone)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
481.96
Ending Stage in Treatise Usage:
Lower Ordovician (upper Tremadocian, Psigraptus Biozone)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
477.08
Description
Reclined multiramous to pauciramous anisograptid with partly isolated metasicula and metathecae, proximal end biradiate with short, first-order stipes, bithecae present, but variably developed, autothecae tubular, without rutellum, considerably curved when aperturally isolated
References
Jackson, D. E. 1967. Psigraptus, a new graptolite genus from the Tremadocian of Yukon, Canada. Geological Magazine 104(4):317-321.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Anisograptidae
Formal Genus Name and Reference:
Psigraptus JACKSON, 1967, p. 314
Type Species:
*P. arcticus, OD
Images
(Click to enlarge in a new window)
Fig. 164,3a. P. arcticus, holotype, GSC 21248, scale bar, 1 mm (new), Fig. 164,3b. P. lenzi (JACKSON), holotype, GSC 21253, scale bar, 1 mm (new), Fig. 164,3c. P. hunjiangensis (ZHAO & ZHANG), holotype, scale bar, 1 mm (new), Fig. 164,3d. P. reclinatus (Zhao & Zhang), holotype, scale bar, 1 mm (new), ——Fig. 164,3 e. P. typicus (Zhao & Zhang), holotype, scale bar, 1 mm (new), ——Fig. 164,3f. P. sinicus (Zнао & Zhang), holotype, scale bar, 1 mm (new)
Synonyms
Yukonograptus, Muenzhigraptus, Diphygraptus, Hunjiangograptus, Holopsigraptus, Clonograptus, Neoclonograptus
Geographic Distribution
Australia, China, South Korea, Canada
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (upper Tremadocian, Psigraptus Biozone)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
481.96
Ending Stage in Treatise Usage:
Lower Ordovician (upper Tremadocian, Psigraptus Biozone)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
0
Ending Date:
477.08
Description
Reclined multiramous to pauciramous anisograptid with partly isolated metasicula and metathecae, proximal end biradiate with short, first-order stipes, bithecae present, but variably developed, autothecae tubular, without rutellum, considerably curved when aperturally isolated
References
Jackson, D. E. 1967. Psigraptus, a new graptolite genus from the Tremadocian of Yukon, Canada. Geological Magazine 104(4):317-321.