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Akidograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Dimorphograptidae
Formal Genus Name and Reference:
Akidograptus DAVIES, 1929, p. 9
Type Species:
* A. ascensus, OD
Images
(Click to enlarge in a new window)
Fig. 287,2a-b. * A. ascensus, 2a, holotype, SM A10021 (adapted from Melchin & others, 2011, fig. 6 G ), 2 b, holotype (adapted from Rigby, 2000). Scale bars, 1 mm
Synonyms
Geographic Distribution
China, UK, Germany, Denmark, Norway, Sweden, Canada (Arctic), USA
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, Akidograptus ascensus Biozone)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, Atavograptus atavus Biozone)
Ending International Stage:
Rhuddanian
Fraction Up In Ending Stage:
0
Ending Date:
440.49
Description
Biserial monograptoid with protracted proximal end and early upward growth of first two thecae, proximal end probably with pattern J astogeny, thecae slender and elongated, strongly geniculate, with straight apertures lacking genicular flanges
References
Davies, K. A. 1929. Notes on the graptolite faunas of the Upper Ordovician and Lower Silurian. Geological Magazine 66(1):1-27.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Dimorphograptidae
Formal Genus Name and Reference:
Akidograptus DAVIES, 1929, p. 9
Type Species:
* A. ascensus, OD
Images
(Click to enlarge in a new window)
Fig. 287,2a-b. * A. ascensus, 2a, holotype, SM A10021 (adapted from Melchin & others, 2011, fig. 6 G ), 2 b, holotype (adapted from Rigby, 2000). Scale bars, 1 mm
Synonyms
Geographic Distribution
China, UK, Germany, Denmark, Norway, Sweden, Canada (Arctic), USA
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, Akidograptus ascensus Biozone)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, Atavograptus atavus Biozone)
Ending International Stage:
Rhuddanian
Fraction Up In Ending Stage:
0
Ending Date:
440.49
Description
Biserial monograptoid with protracted proximal end and early upward growth of first two thecae, proximal end probably with pattern J astogeny, thecae slender and elongated, strongly geniculate, with straight apertures lacking genicular flanges
References
Davies, K. A. 1929. Notes on the graptolite faunas of the Upper Ordovician and Lower Silurian. Geological Magazine 66(1):1-27.