Asaphus
kotlukovi var tumidus
Trilobites
Order Asaphida, Family Asaphidae
Geological
Time: Middle Ordovician, Botomian Stage
Size: 60
mm
Fossil Site:
Wolchow River Region, St Petersburg, Russia
Description:
A well-inflated example of a medium-eyestalked member of the
Asaphidae, this is Asaphus kotlukovi. This particular example
is of the variety called tumidus by A.J. Ivantsov. The region
in which these trilobites lived was subject to dramatic changes
in salinity and turbidity, and the trilobites were able to make
rapid (geologically speaking) evolutionary adjustments. These
adjustments were thought to be able to allow them to see both
predator and prey more easily.
Also
see: Russian Trilobites Asaphid
Trilobites
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