Edited by TqB
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Belemnite with phragmocone
Images: 
By TqB (edited)
Taxonomy
Belemnite
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Belemnitida
Family: Belemnitidae
Genus: Megateuthis
Species: Megateuthis glaber
Author Citation (Simpson, 1855)
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Early
International Age: Toarcian
Stratigraphy
Whitby Mudstone Formation
Cement Shales
Biostratigraphy
Bifrons Zone
Crassum Subzone
Provenance
Collector: self
Date Collected: 04/09/2015
Acquired by: Field Collection
Dimensions
Length: 21 cm
Location
Whitby coast
North Yorkshire
England
Comments
The phragmocone is partly in a nodule, the rostrum protruding from it - quite rare in these beds.
It has the remains of an epirostrum.
Assigned to Megateuthis in:
Doyle, P. 1990-92 The British Toacian (Lower Jurassic) Belemnites. Monograph of the Palaeontographical Society, London: Part 2, 50-79, pls.18-28 (Publ. No. 587, vol. 145
Contentious taxonomy down the years - diagnostic features include the pair of dorsolateral apical grooves.
Similar specimens of Acrocoelites sp. are supposed to have an additional ventral groove but this is variable ...
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