Eurypterids
Specimen of the Month
Samuel J. Ciurca, Jr., Rochester, New York           by Eurypterids.net
MARCH 2009
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Slimonia - a great eurypterid from the U.K.
(courtesy of Dean Lomax & Doncaster Museum)
ABOVE: Dean Lomax (Doncaster Museum) holding a wonderful specimen of Slimonia, probably Slimonia
acuminata
Salter 1856. This peculiar eurypterid apparently grew to over 1 meter in length. It is especially
known from the Early Silurian Period at Lesmahagow, Scotland.
      Check out:
http://www.hmag.gla.ac.uk/neil/Lesmahagow/Lesmahagow.html
Photo courtesy of Dean Lomax.
ABOVE: A closer view of this great
specimen. Note the very long, somewhat
rectangular carapace and the small eyes
located in the anterior corners of the
carapace. The specimen is a molt - what
is not known for certain is whether
Slimonia actually lived in the area where
specimens are found or if the remains
were deposited by storms after molted
material was washed into the area of
deposition. At right is a larger view of the
carapace - note the circular wrinkling on
the anterior portion of the head. This
indicates that in life, the carapace was
highly inflated. During preservation, the
weight of overlying sediments flattened
the molt (moult).
    
Dean Lomax
Dean Lomax
Doncaster Museum & Art Gallery
Doncaster, UK
CLICK THE LINKS BELOW
Thank you Dean Lomax
ABOVE: A nearly complete (molted)
individual with a portion of the telson
present. At the left end of the specimen,
note the operculum with the median sex
appendage.

LEFT: A closer view of the operculum
which has been turned around probably
during transportation into the site of
deposition or during ecdysis.
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