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Oktavites

Classification

    Phylum:  
Hemichordata
    Class:  
Pterobranchia
    Order:  
Graptoloidea
    Superfamily:  
Neograptina
    Family:  
Monograptidae
    Formal Genus Name and Reference:  
Oktavites LEVINA, 1928, p. 10
    Type Species:  
*Graptolithus spiralis Geinitz, 1842, p. 700, SD OBUT, 1964, p. 328


Images

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Fossil Image
Fig. 300,6a-c. *O. spiralis (Geinitz), 6a, syntype (not preserved, see Maletz, 2001a, p. 171) (Geinitz, 1842, pl.


Synonyms

Obutograptus


Geographic Distribution

worldwide


Age Range

    Beginning Stage in Treatise Usage:  
Silurian (Aeronian, Stimulograptus sedgwickii Biozone)
    Beginning International Stage:  
Aeronian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
440.49
    Ending Stage in Treatise Usage:  
Silurian (Telychian, Cyrtograptus lapworthi Biozone)
    Ending International Stage:  
Telychian
    Fraction Up In Ending Stage:  
0
    Ending Date:  
432.93


Description

Dorsally curved or spirally coiled tubarium, metathecae triangular, sometimes almost rastritiform proximally, with little or no overlap, thecal apertures laterally expanded, sometimes asymmetrically, torsion, affecting the entirety of metatheca, developed distally, extension of metathecal dorsal wall over central portion of aperture causes this to face dorsally




References

Levina, E. F. 1928. Graptolitit iz Aq-Tengi v Turkestanskom chrebte. Trudy Sredie-Aziatskogo Gosydarstvennogo Universiteta, Series 7a, Geologiya 5:1-18.


Museum or Author Information

not preserved, see Maletz, 2001, Geinitz, 1842