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Cryptograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Glossograptidae
Formal Genus Name and Reference:
Cryptograptus LAPWORTH, 1880a, p. 174
Type Species:
*Diplograpsus tricornis CARRUTHERS, 1858, p. 468, OD
Images
(Click to enlarge in a new window)
Fig. 220,1a. *C. tricornis (Carruthers), lectotype, NHMUK Q1299, Hartfell Spa, Hartfell Shales, Scotland, scale bar, 5 mm (Elles & Wood, 1908, pl. 32, fig. 12A), Fig. 220,1b. C. insectiformis Ruedemann, 1908, juvenile, MCZ 106835, showing reduction of fusellum, Viola Springs Limestone, Arbuckle Mountains, Oklahoma, USA, scale bar, 1 mm (Maletz & Mitchell, 1996, fig. 6.5), -Fig. 220,1c. C. schaeferi Lapworth, 1880a, GSC 87720, nematularium, holotype of T. subulatus Williams, 1992, western Newfoundland, Canada, scale bar, 1 mm (new)
Synonyms
Tonograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (lower Darriwilian, Undulograptus austrodentatus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
469.42
Ending Stage in Treatise Usage:
Upper Ordovician (Katian, Diplacanthograptus spiniferus Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Monopleural, scandent glossograptid formed through dextral torsion of stipes around sicula, paired lateral apertural spines restricted to sicula, origin of th $1^{1}$ through resorption foramen in metasicula, th $1^{2}$ initially growing upward and across reverse side of sicula, proximal development type isograptid, dextral, sicula and early thecae reduced to several bars and lists in biostratigraphically younger species
References
Lapworth, Charles. 1880a. On new British graptolites. Annals and Magazine of Natural History (series 5) 5:149-177.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Glossograptidae
Formal Genus Name and Reference:
Cryptograptus LAPWORTH, 1880a, p. 174
Type Species:
*Diplograpsus tricornis CARRUTHERS, 1858, p. 468, OD
Images
(Click to enlarge in a new window)
Fig. 220,1a. *C. tricornis (Carruthers), lectotype, NHMUK Q1299, Hartfell Spa, Hartfell Shales, Scotland, scale bar, 5 mm (Elles & Wood, 1908, pl. 32, fig. 12A), Fig. 220,1b. C. insectiformis Ruedemann, 1908, juvenile, MCZ 106835, showing reduction of fusellum, Viola Springs Limestone, Arbuckle Mountains, Oklahoma, USA, scale bar, 1 mm (Maletz & Mitchell, 1996, fig. 6.5), -Fig. 220,1c. C. schaeferi Lapworth, 1880a, GSC 87720, nematularium, holotype of T. subulatus Williams, 1992, western Newfoundland, Canada, scale bar, 1 mm (new)
Synonyms
Tonograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Middle Ordovician (lower Darriwilian, Undulograptus austrodentatus Biozone)
Beginning International Stage:
Darriwilian
Fraction Up In Beginning Stage:
0
Beginning Date:
469.42
Ending Stage in Treatise Usage:
Upper Ordovician (Katian, Diplacanthograptus spiniferus Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Monopleural, scandent glossograptid formed through dextral torsion of stipes around sicula, paired lateral apertural spines restricted to sicula, origin of th $1^{1}$ through resorption foramen in metasicula, th $1^{2}$ initially growing upward and across reverse side of sicula, proximal development type isograptid, dextral, sicula and early thecae reduced to several bars and lists in biostratigraphically younger species
References
Lapworth, Charles. 1880a. On new British graptolites. Annals and Magazine of Natural History (series 5) 5:149-177.