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Coronograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Monograptidae
Formal Genus Name and Reference:
Coronograptus Obut & Sobolevskaya in Obut, Soboleveskaya, & MERKUREVA, 1968, p. 92
Type Species:
*Monograptus gregarius LAPWORTH, 1876c, p. 317, OD
Images
(Click to enlarge in a new window)
Fig. 294,1a. * C. gregarius (Lapworth), syntype, BU 1435, Dob's Linn, Scotland, scale bar, 1 mm (Zalasiewicz, 2000e, Atlas Folio 1.13), ——Fig. 294,1b. C. cyphus (Lapworth, 1876b), typical specimen BU 1430, Dob's Linn, Scotland, scale bar, 5 mm (Zalasiewicz, Williams, & Akhurst, 2003, fig. 2A)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, Coronograptus cyphus Biozone
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Lituigraptus convolutus Biozone)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
0
Ending Date:
438.59
Description
Strongly dorsally curved tubarium that may become straight distally, sicula long (2.5-16 mm), with majority of length contributed by metasicula, which possesses a resorption porus, first theca emerges high on metasicula, thecae long overlapping tubes, geniculate immediately above or below thecal apertures, with concave free ventral thecal walls subaperturally at least in proximal thecae, flared, unornamented thecal apertures, genicular hoods may be developed proximally or throughout tubarium but are absent in most species
References
Obut, A. M., R. F. Sobolevskaya, & A. P. Merkureva. 1968. Graptolity Llandoveri v kernach burovitch skvazhin Norilskogo raiona. Akademia Nauk SSSR, Sibirskoe Otdelenie, Institut Geologii i Geofiziki, Ministerstvo Geologii SSSR, Nauchno-Issledovatelskie Institut Geologii Arktiki. Moscow. 137 p., 35 pl . In Russian.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Monograptidae
Formal Genus Name and Reference:
Coronograptus Obut & Sobolevskaya in Obut, Soboleveskaya, & MERKUREVA, 1968, p. 92
Type Species:
*Monograptus gregarius LAPWORTH, 1876c, p. 317, OD
Images
(Click to enlarge in a new window)
Fig. 294,1a. * C. gregarius (Lapworth), syntype, BU 1435, Dob's Linn, Scotland, scale bar, 1 mm (Zalasiewicz, 2000e, Atlas Folio 1.13), ——Fig. 294,1b. C. cyphus (Lapworth, 1876b), typical specimen BU 1430, Dob's Linn, Scotland, scale bar, 5 mm (Zalasiewicz, Williams, & Akhurst, 2003, fig. 2A)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, Coronograptus cyphus Biozone
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Lituigraptus convolutus Biozone)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
0
Ending Date:
438.59
Description
Strongly dorsally curved tubarium that may become straight distally, sicula long (2.5-16 mm), with majority of length contributed by metasicula, which possesses a resorption porus, first theca emerges high on metasicula, thecae long overlapping tubes, geniculate immediately above or below thecal apertures, with concave free ventral thecal walls subaperturally at least in proximal thecae, flared, unornamented thecal apertures, genicular hoods may be developed proximally or throughout tubarium but are absent in most species
References
Obut, A. M., R. F. Sobolevskaya, & A. P. Merkureva. 1968. Graptolity Llandoveri v kernach burovitch skvazhin Norilskogo raiona. Akademia Nauk SSSR, Sibirskoe Otdelenie, Institut Geologii i Geofiziki, Ministerstvo Geologii SSSR, Nauchno-Issledovatelskie Institut Geologii Arktiki. Moscow. 137 p., 35 pl . In Russian.