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Paratetragraptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Dichograptina
Family:
Phyllograptidae
Formal Genus Name and Reference:
Paratetragraptus OBUT, 1957, p. 38
Type Species:
*Tetragraptus approximatus NICHOLSON, 1873, p. 136, OD
Images
(Click to enlarge in a new window)
Fig. 195,1. *P. approximatus (Nicholson), lectotype, NHMUK PM 1996, Lévis, Quebec, Canada (G-locality, see Maletz, 1997b), scale bar, 1 mm (Nicholson, 1873, fig. 2a)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Floian, Paratetragraptus approximatus Biozone)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Lower Ordovician (Floian, Tshallograptus fruticosus Biozone)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Phyllograptid with nearly horizontal tubarium, proximal end with slightly deflexed funicle, paired, parallel-oriented second-order stipes, proximal development isograptid, dextral, with robust and wide crossing canals
References
Obut, A. M. 1957. Klassifikatsiya i ukazatel rodov graptolitov. [Classification and ordering of the genera of graptolites]. Vsesoyuznogo Paleontologicheckogo Obsehchectva Ezhegodnik 16:11-47. In Russian.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Dichograptina
Family:
Phyllograptidae
Formal Genus Name and Reference:
Paratetragraptus OBUT, 1957, p. 38
Type Species:
*Tetragraptus approximatus NICHOLSON, 1873, p. 136, OD
Images
(Click to enlarge in a new window)
Fig. 195,1. *P. approximatus (Nicholson), lectotype, NHMUK PM 1996, Lévis, Quebec, Canada (G-locality, see Maletz, 1997b), scale bar, 1 mm (Nicholson, 1873, fig. 2a)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Floian, Paratetragraptus approximatus Biozone)
Beginning International Stage:
Floian
Fraction Up In Beginning Stage:
0
Beginning Date:
477.08
Ending Stage in Treatise Usage:
Lower Ordovician (Floian, Tshallograptus fruticosus Biozone)
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Phyllograptid with nearly horizontal tubarium, proximal end with slightly deflexed funicle, paired, parallel-oriented second-order stipes, proximal development isograptid, dextral, with robust and wide crossing canals
References
Obut, A. M. 1957. Klassifikatsiya i ukazatel rodov graptolitov. [Classification and ordering of the genera of graptolites]. Vsesoyuznogo Paleontologicheckogo Obsehchectva Ezhegodnik 16:11-47. In Russian.