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Arienigraptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Glossograptina
Family:
Isograptidae
Subfamily:
Arienigraptinae
Formal Genus Name and Reference:
Arienigraptus Yu & FANG, 1981a, p. 29
Type Species:
*A. jiangxiensis, OD
Images
(Click to enlarge in a new window)
Fig. 211,1a-b. *A. jiangxiensis, 1a, drawing of holotype, NIGP 50011 (adapted from Ni, Xiao, & Chen, 1991, fig. 4 g ), 16 , photograph of holotype (new, provided by Ni Yunan, 1994). Scale bars, 1 mm
Synonyms
Geographic Distribution
Australia, New Zealand, China, UK, Sweden, Norway, USA, Canada, Russia, Argentina, Peru
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (Dapingian, Isograptus maximus =Arienigraptus hastatus Biozone)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Holmograptus lentus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Two-stiped, reclined manubriate isograptids with simple arienigraptid proximal structure and isograptid symmetry, th $1^{2}$ and th $2^{1}$ cover sicula and th $1^{1}$ in reverse view, showing arienigraptid suture, proximal development type isograptid, dextral, manubrium wedge of highly variable dimensions, th $1^{2}$ with right-handed origin, thecae simple to advanced manubriate, stipes typically poorly developed
References
Yu, Jianhua, & Yiting Fang. 1981a. Arienigraptus, a new graptolite genus from the Ningkuo Formation (Lower Ordovician) of South China. Acta Palaeontologica Sinica 20 (1):27-32, 1 pl .
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Glossograptina
Family:
Isograptidae
Subfamily:
Arienigraptinae
Formal Genus Name and Reference:
Arienigraptus Yu & FANG, 1981a, p. 29
Type Species:
*A. jiangxiensis, OD
Images
(Click to enlarge in a new window)
Fig. 211,1a-b. *A. jiangxiensis, 1a, drawing of holotype, NIGP 50011 (adapted from Ni, Xiao, & Chen, 1991, fig. 4 g ), 16 , photograph of holotype (new, provided by Ni Yunan, 1994). Scale bars, 1 mm
Synonyms
Geographic Distribution
Australia, New Zealand, China, UK, Sweden, Norway, USA, Canada, Russia, Argentina, Peru
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (Dapingian, Isograptus maximus =Arienigraptus hastatus Biozone)
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
Middle Ordovician (Darriwilian, Holmograptus lentus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Two-stiped, reclined manubriate isograptids with simple arienigraptid proximal structure and isograptid symmetry, th $1^{2}$ and th $2^{1}$ cover sicula and th $1^{1}$ in reverse view, showing arienigraptid suture, proximal development type isograptid, dextral, manubrium wedge of highly variable dimensions, th $1^{2}$ with right-handed origin, thecae simple to advanced manubriate, stipes typically poorly developed
References
Yu, Jianhua, & Yiting Fang. 1981a. Arienigraptus, a new graptolite genus from the Ningkuo Formation (Lower Ordovician) of South China. Acta Palaeontologica Sinica 20 (1):27-32, 1 pl .