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Oktavites (Monograptus) spiralis
Images: 
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By TqB
Taxonomy
Graptolite
Kingdom: Animalia
Phylum: Pterobranchia
Class: Graptolithina
Order: Graptoloidea
Family: Monograptidae
Genus: Oktavites
Species: O. spiralis
Author Citation (Geinitz, 1842)
Geological Time Scale
Era: Paleozoic
Period: Silurian
Epoch: Early
International Age: Llandovery/ Telychian
Stratigraphy
Lower Graptolitic Shales (informal)
Biostratigraphy
O. spiralis Zone
Provenance
Date Collected: 10/01/2015
Acquired by: Purchase/Trade
Dimensions
Diameter: 35 mm
Location
Zdanow section, Bardzkie Mountains.
Ząbkowice Śląskie County
Lower Silesia Province
Poland
Comments
One of a number of spiral monograptids from this period and a zone species, these have all been referred to Monograptus at various times as well as separate genera based on rhabdosome form which may not be of significant importance.
It is bisected by an unidentified straight Monograptus.
Reference for ID (as Monograptus spiralis): Elles & Wood 1901-1918, Monograph on British Graptolites, Pal. Soc. Monograph 33.
(Plate XLVIII, fig. 7).
Now generally referred to Oktavites Levina, 1928, e.g. in J. A. Zalasiewicz, L. Taylor et al 2009, Graptolites in British Stratigraphy, Geol Mag. 146, pp. 785-850.
And here: http://fossiilid.info/9458
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