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Laevaptychus obliquus (Quenstedt)
Images: 
By Ludwigia
Taxonomy
Aptychus
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Ammonitida
Family: Aspidoceratidae
Genus: Laevaptychus
Species: Laevaptychus obliquus
Author Citation Quenstedt
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Late
International Age: Early Kimmeridgian
Stratigraphy
Lacunosa-Mergel Formation
Biostratigraphy
hypselocylum zone
Provenance
Collector: Roger Furze
Date Collected: 08/10/2011
Acquired by: Field Collection
Dimensions
Length: 3.5 cm
Location
Hausen i. Tal
Upper Danube Valley
Baden-Wuerttemberg
Germany
Comments
Aptychi mostly existed as bilaterally symmetrical pairs and were part of the anatomy of many ammonites. They are believed to have been either a two-valved closing hatch at the aperture or else a double-plate jaw piece. These particular ones are associated with the ammonite genus Aspidoceras. The photo shows a pair in ventral and dorsal views.
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