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Dimorphograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Axonophora
Infraorder:
Neograptina
Superfamily:
Retiolitoidea
Family:
Retiolitoidea - Family Uncertain
Formal Genus Name and Reference:
Dimorphograptus LAPWORTH, 1876, p. 545
Type Species:
* D$. elongatus Lapworth, 1876, p. 547, SD BASSLER, 1915a, p. 441
Images
(Click to enlarge in a new window)
Fig. 288, 1a-b. D. extenuatus Elles & Wood, 1908, 1 a, lectotype (selected by Hutt, 1974c, p. 55), UM K736 (Elles & Wood, 1908, pl. 35,10a), 1b, SM A20814, proximal end showing sicula (Príbyl, 1948, fig. 4). Scale bars, 1 mm, Fig. 288,1c-e. * D. elongatus, 1 c, BU 1423, curved specimen (Bulman, 1970, fig. 97,2B), 1 d, lectotype, BU 1423, straight specimen (Elles & Wood, 1908, pl. 35,11a), 1e, curved specimen, Bornholm, Denmark, (Koren' & Bjerreskov, 1997, fig. 17B). Scale bars, 1 mm
Synonyms
Metadimorphograptus
Geographic Distribution
Morocco, China, ?New Zealand, UK, France, Germany, Denmark, Sweden, Serbia, Canada (Arctic)
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, upper Cystograptus vesiculosus Biozone)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, upper Cystograptus vesiculosus Biozone)
Ending International Stage:
Rhuddanian
Fraction Up In Ending Stage:
100
Ending Date:
440.49
Description
Straight to proximally curved dimorphograptid with long uniserial part, thecae with distinct geniculum and small, slit-like apertures, proximal development pattern probably of pattern J' astogeny, biserial portion probably fully septate
References
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Subclass:
Graptolithina
Order:
Graptoloidea
Suborder:
Axonophora
Infraorder:
Neograptina
Superfamily:
Retiolitoidea
Family:
Retiolitoidea - Family Uncertain
Formal Genus Name and Reference:
Dimorphograptus LAPWORTH, 1876, p. 545
Type Species:
* D$. elongatus Lapworth, 1876, p. 547, SD BASSLER, 1915a, p. 441
Images
(Click to enlarge in a new window)
Fig. 288, 1a-b. D. extenuatus Elles & Wood, 1908, 1 a, lectotype (selected by Hutt, 1974c, p. 55), UM K736 (Elles & Wood, 1908, pl. 35,10a), 1b, SM A20814, proximal end showing sicula (Príbyl, 1948, fig. 4). Scale bars, 1 mm, Fig. 288,1c-e. * D. elongatus, 1 c, BU 1423, curved specimen (Bulman, 1970, fig. 97,2B), 1 d, lectotype, BU 1423, straight specimen (Elles & Wood, 1908, pl. 35,11a), 1e, curved specimen, Bornholm, Denmark, (Koren' & Bjerreskov, 1997, fig. 17B). Scale bars, 1 mm
Synonyms
Metadimorphograptus
Geographic Distribution
Morocco, China, ?New Zealand, UK, France, Germany, Denmark, Sweden, Serbia, Canada (Arctic)
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, upper Cystograptus vesiculosus Biozone)
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
Silurian, Llandovery (Rhuddanian, upper Cystograptus vesiculosus Biozone)
Ending International Stage:
Rhuddanian
Fraction Up In Ending Stage:
100
Ending Date:
440.49
Description
Straight to proximally curved dimorphograptid with long uniserial part, thecae with distinct geniculum and small, slit-like apertures, proximal development pattern probably of pattern J' astogeny, biserial portion probably fully septate