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Expansograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Didymograptidae
Formal Genus Name and Reference:
Expansograptus Bouček & PŘÍBYL, 1952a, p. 13
Type Species:
*Graptolithus extensus HALL, 1858, p. 132, OD
Images
(Click to enlarge in a new window)
Fig. 198,3a-b. *E. extensus (Hall), lectotype, GSC 976, proximal end (a) and complete specimen (b), scale bars, 1 mm (Cooper & Fortey 1982, fig. 40d-e)
Synonyms
Extensograptus
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:
Middle Ordovician (Darriwilian, Undulograptus austrodentatus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
458.18
Description
More or less horizontal didymograptids with isograptid, dextral proximal development, proximal portion of sicula perpendicular to stipes, sicular and thecal apertures straight, without elaborations, origin of th $1^{1}$ low on prosicula, stipe width variable, crossing canals more or less symmetrically placed on sicula, crossing canal 1 is initially much wider than crossing canal 2, length of isograptid suture variable
References
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Didymograptidae
Formal Genus Name and Reference:
Expansograptus Bouček & PŘÍBYL, 1952a, p. 13
Type Species:
*Graptolithus extensus HALL, 1858, p. 132, OD
Images
(Click to enlarge in a new window)
Fig. 198,3a-b. *E. extensus (Hall), lectotype, GSC 976, proximal end (a) and complete specimen (b), scale bars, 1 mm (Cooper & Fortey 1982, fig. 40d-e)
Synonyms
Extensograptus
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:
Middle Ordovician (Darriwilian, Undulograptus austrodentatus Biozone)
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
0
Ending Date:
458.18
Description
More or less horizontal didymograptids with isograptid, dextral proximal development, proximal portion of sicula perpendicular to stipes, sicular and thecal apertures straight, without elaborations, origin of th $1^{1}$ low on prosicula, stipe width variable, crossing canals more or less symmetrically placed on sicula, crossing canal 1 is initially much wider than crossing canal 2, length of isograptid suture variable