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Pristiograptus

Classification

    Phylum:  
Hemichordata
    Class:  
Pterobranchia
    Order:  
Graptoloidea
    Superfamily:  
Neograptina
    Family:  
Monograptidae
    Formal Genus Name and Reference:  
Pristiograptus JAEKEL, 1889, p. 667
    Type Species:  
* P. frequens, OD


Images

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Fossil Image
Fig. 304,8a-d. * P. frequens, 8a, neotype, MB.G 458.3.1, selected by ŠTORCH, Manda, & Loydell, 2014, p. 1016 (Jaeger, 1991, fig. 26.9), 86-d, P. dubius (Suess, 1851), isolated specimens, glacial boulder, note the lack of sicular annuli (Maletz, 1999a, fig. 2Q-S). Scale bars, 1 mm.


Synonyms



Geographic Distribution

worldwide


Age Range

    Beginning Stage in Treatise Usage:  
Silurian, Llandovery (Rhuddanian, Cystograptus vesiculosus Biozone)
    Beginning International Stage:  
Rhuddanian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
443.07
    Ending Stage in Treatise Usage:  
Silurian, Pridoli (Skalograptus perneri Biozone)
    Ending International Stage:  
Pridoli
    Fraction Up In Ending Stage:  
0
    Ending Date:  
419


Description

Tubarium straight or gently dorsally or ventrally curved, thecal length increasing along first few thecae, later constant, sicula of medium length with low origin of th 1, thecae straight, cylindrical, with straight or nearly straight ventral wall, thecal aperture without any supplementary structures except thickened apertural rim




References

Jaekel, Otto. 1889. Über das Alter des sog. Graptolithengesteins mit besonderer Berücksichtigung der in demselben enthaltenen Graptolithen. Zeitschrift der Deutschen Geologischen Gesellschaft 41:653716.


Museum or Author Information

Jaeger, 1991, Suess, 1851, Maletz, 1999