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Diplograptus

Classification

    Phylum:  
Hemichordata
    Class:  
Pterobranchia
    Order:  
Graptoloidea
    Superfamily:  
Unknown
    Family:  
Diplograptidae
    Formal Genus Name and Reference:  
Diplograptus M‘COY, 1850, p. 270
    Type Species:  
*Prionotus pristis Hisinger, 1837, p. 114, SD GURLEY, 1896, p. 78


Images

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Fossil Image
Fig. 229,9a-c. { }^{*} D. pristis (Hisinger), 9a, holotype, NRM-PZ Cn 59728, Draggabro, Dalarna, Sweden (new, drawing by John F. Riva), 9b, GIT 708-1, infrared photo, obverse view, showing sicular length, 9c, GIT 708-1, reverse view, Paasvere drill core, Estonia ( b-c, Mitchell, Maletz, \\& Goldman, 2009, fig. 1 \\mathrm{E}-2 \\mathrm{E}). Scale bars, 1 mm.


Synonyms

Diplograpsis


Geographic Distribution

China, Europe, UK, Estonia, Sweden, Canada, USA, Russia (Siberia)


Age Range

    Beginning Stage in Treatise Usage:  
Upper Ordovician (upper Katian, Pleurograptus linearis Biozone)
    Beginning International Stage:  
Katian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
448.98
    Ending Stage in Treatise Usage:  
Upper Ordovician (Hirnantian, Normalograptus extraordinarius Biozone)
    Ending International Stage:  
Hirnantian
    Fraction Up In Ending Stage:  
0
    Ending Date:  
443.07


Description

Diplograptines with bluntly rounded proximal end, th $1^{1}$ and th $1^{2}$ with subapertural or apertural spines, tubarium with or without median septum and alternating thecal origin, thecal gradient with proximally geniculate to distally straight, outward-inclined ventral sides and everted thecal apertures, proximal development probably of pattern G astogeny




References

M'Coy, Frederick. 1850. On Some New Genera and Species of Silurian Radiata in the Collection of the University of Cambridge. Annals and Magazine of Natural History (series 2) 6:270-290.


Museum or Author Information

GIT, NRM, $b-c$, Mitchell, Maletz, \\& Goldman, 2009