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Amplexograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Diplograptidae
Formal Genus Name and Reference:
Amplexograptus Elles & WOOD, 1907, p. 267
Type Species:
*Diplograptus perexcavatus LAPWORTH, 1876a, pl. 2, 38, OD
Images
(Click to enlarge in a new window)
Fig. 231, 1 a-b.^{*} A. perexcavatus (Lapworth), 1 a, neotype, BU 1297a, 1b, BU 1297b, proximal end of unfigured specimen from neotype slab, scale bars, 1 mm (new, drawings by John F. Riva), ——Fig. 231,1c. A. leptotheca Bulman, 1946, BU 1299, holotype of A. fallax Bulman, 1962, scale bar, 1 mm (new, drawing by John F. Riva), ——Fig. 231,1d. A. maxwelli Decker, 1935b, MCZ 115921, isolated specimen, note distal origin of median septum, Bromide Formation, Oklahoma, USA, scale bar, 1 mm (Goldman, Campbell, \& Rahl, 2002, fig. 2,11)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Sandbian, Climacograptus bicornis Biozone)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (Katian, Diplacanthograptus caudatus Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Peiragraptines with square proximal end, prominent antivirgellar spines and subapertural spine on th $1^{1}$, but not on th $1^{2}$, thecae geniculate, often with short, outward-inclined supragenicular walls, median septum delayed or lacking, pattern G astogeny, thecal apertures horizontal, with lateral apertural lappets
References
Elles, G. L., & E. M. R. Wood. 1907. A Monograph of British Graptolites. Part 6. Palaeontographical Society of London Monograph 61(297):xcvii-cxx, 217-272, pl. 28-31.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Unknown
Family:
Diplograptidae
Formal Genus Name and Reference:
Amplexograptus Elles & WOOD, 1907, p. 267
Type Species:
*Diplograptus perexcavatus LAPWORTH, 1876a, pl. 2, 38, OD
Images
(Click to enlarge in a new window)
Fig. 231, 1 a-b.^{*} A. perexcavatus (Lapworth), 1 a, neotype, BU 1297a, 1b, BU 1297b, proximal end of unfigured specimen from neotype slab, scale bars, 1 mm (new, drawings by John F. Riva), ——Fig. 231,1c. A. leptotheca Bulman, 1946, BU 1299, holotype of A. fallax Bulman, 1962, scale bar, 1 mm (new, drawing by John F. Riva), ——Fig. 231,1d. A. maxwelli Decker, 1935b, MCZ 115921, isolated specimen, note distal origin of median septum, Bromide Formation, Oklahoma, USA, scale bar, 1 mm (Goldman, Campbell, \& Rahl, 2002, fig. 2,11)
Synonyms
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Upper Ordovician (Sandbian, Climacograptus bicornis Biozone)
Beginning International Stage:
Sandbian
Fraction Up In Beginning Stage:
0
Beginning Date:
458.18
Ending Stage in Treatise Usage:
Upper Ordovician (Katian, Diplacanthograptus caudatus Biozone)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
0
Ending Date:
445.21
Description
Peiragraptines with square proximal end, prominent antivirgellar spines and subapertural spine on th $1^{1}$, but not on th $1^{2}$, thecae geniculate, often with short, outward-inclined supragenicular walls, median septum delayed or lacking, pattern G astogeny, thecal apertures horizontal, with lateral apertural lappets
References
Elles, G. L., & E. M. R. Wood. 1907. A Monograph of British Graptolites. Part 6. Palaeontographical Society of London Monograph 61(297):xcvii-cxx, 217-272, pl. 28-31.