Order Asaphida, Superfamily Asaphoidea,
Time : Ordovician
Asery level, St. Petersburg region, Wolchow river, Russia
fossil exemplifies the expression of the trilobite genome at
A huge and magnificent Asaphus cornutus from the Ordovician strata
near Saint Pertersburg, Russia. This specimen is at or near the
species size limit and has extraordinary exoskeleton preservation.
assciation with a 38 mm-diameter cystoid.
This taxon derives its species name cornutus from the Latin for
horned, referring to the eyestalks. Asaphus cornutus is midway
or so in an
sequence of increasing eye stalk heights
among Russian Ordovian trilobites on the Asaphidae family.
see: Russian Trilobites Gallery Russian Asaphidae Evolution Sequence