Description:
Coming from the Middle Ordovician deposits of the Wolchow River
region near Saint Petersburg, Russia, this is an example of the
unusual trilobite Asaphus (Subasaphus) platyurus. It is known for
the dramatically curved genal spines. Its dark caramel-colored Calcite
shell is well set off by the white limestone matrix, with the trilobite
well positioned on its nearly half billion-year-old seafloor throne.
As always, the skillful Russian preparators have shown this fine
3-D specimen to best advantage, with the genals offering a dramatic
touch. Prone examples of this taxon are always in demand, and this
is a fine example sure to become a cornerstone of any collection
of Russian Asaphids.
Coming
from an inland sea during the lower to middle Ordovician, the
Russian trilobites from near Saint Petersburg, Russia participated
in the Great
Ordovician Radiation, which saw marine animal diversity
increase three-fold more than the Cambrian Explosion. The Russian
asaphid trilobites are a particularly interesting example
of descent with modification. |