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Acrograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Sinograptina
Family:
Sigmargraptidae
Subfamily:
Multiramous to single- stiped genera with simple thecae
Formal Genus Name and Reference:
Acrograptus Tzaj 1969, p. 142
Type Species:
*Didymograptus affinis NICHOLSON, 1869, p. 240, OD
Images
(Click to enlarge in a new window)
Fig. 171,4a-b. *A. affinis (Nicholson), 4a, lectotype (selected by Elles & Wood, 1901, p. 24), NHMUK PI Q.3108, 4b, possible topotype, NHMUK PI Q.5858a, low relief showing th2 { }^{1} originating on distal end of th 1^{1} (arrow), indicating artus-type development, Llanvirn (Darriwilian), Tarn Moor Formation, Aik Beck, east of Ullswater, Cumbria, UK, scale bars, 1 mm (Rushton, 2000a, Atlas, Folio 1.1).
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (Darriwilian, ?Levisograptus dentatus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
469.42
Ending Stage in Treatise Usage:
Upper Ordovician (Sandbian, Nemagraptus gracilis Biozone)
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
100
Ending Date:
452.75
Description
Slender sigmagraptine with two horizontal to declined stipes, sicula small, triangular, proximal development artus type, thecae slender and with low thecal overlap or with distally increasing overlap
References
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Sinograptina
Family:
Sigmargraptidae
Subfamily:
Multiramous to single- stiped genera with simple thecae
Formal Genus Name and Reference:
Acrograptus Tzaj 1969, p. 142
Type Species:
*Didymograptus affinis NICHOLSON, 1869, p. 240, OD
Images
(Click to enlarge in a new window)
Fig. 171,4a-b. *A. affinis (Nicholson), 4a, lectotype (selected by Elles & Wood, 1901, p. 24), NHMUK PI Q.3108, 4b, possible topotype, NHMUK PI Q.5858a, low relief showing th2 { }^{1} originating on distal end of th 1^{1} (arrow), indicating artus-type development, Llanvirn (Darriwilian), Tarn Moor Formation, Aik Beck, east of Ullswater, Cumbria, UK, scale bars, 1 mm (Rushton, 2000a, Atlas, Folio 1.1).
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (Darriwilian, ?Levisograptus dentatus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
469.42
Ending Stage in Treatise Usage:
Upper Ordovician (Sandbian, Nemagraptus gracilis Biozone)
Ending International Stage:
Sandbian
Fraction Up In Ending Stage:
100
Ending Date:
452.75
Description
Slender sigmagraptine with two horizontal to declined stipes, sicula small, triangular, proximal development artus type, thecae slender and with low thecal overlap or with distally increasing overlap