Onnia
sp
Trilobites
Order Asaphida, Family Trinucleidae
Geological
Time: Ordovician
Size (25.4
mm = 1 inch): Trilobite is 40 mm long by 32 mm wide (with spines)
on a 50 by 35 mm matrix
Fossil Site:
Taouz, Tisserdmine, Morocco
Fossil Code:
14035
Price: Sold
Description:
This fine plaque houses a fine example of a trilobite of the
species Onnia . In all likelihood it is unnamed. In the past
trilobites from Morocco were taken to Europe where they often
were assigned names of local species. For the sake of argument
let us call this Onnia sp. until such trilobites can be sorted
out.. These are quite a bit larger than the ones from Blekos
typically called Onnia superba. There are many fine details evident
such as the pitted cephalic ring by which the trilobites fed.
They presumably swam along just above the seafloor, using their
legs to kick up suspended matter into their filter chamber with
the water existing dorsally through the fenestrae (pits, Latin
for windows). This one has been prepared entirely free of matrix
except for the thin pedestal which suspends it in space. With
the advent of a reliable source of electricity in Morocco, the
quality of preparation has improved dramatically over the past
few years. While I used to refer to trilobites prepared in a
mode similar to this as flying, I feel a new term is warranted
by the preparation now coming into vogue. This specimen is truly
stunning when viewed from any aspect, and is destined to become
the cornerstone of any collection, public or private. It is the
FIRST and ONLY example of this large Onnia species which I have
seen prepared in this freestanding mode.
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