Specimen of the Month
Samuel J. Ciurca, Jr., Rochester, New York by Eurypterids.net
ABOVE: Acutiramus cummingsi
Carapace (note the large bulging eyes) of this characteristic pterygotid of the Williamsville
Waterlime, Bertie Group of western New York and Ontario, Canada.
BELOW: Ceratiocaris sp. (phyllocarid)
Organic remains within waterlimes are often collected into windrows of current-aligned molted
parts of the arthropods. Size-sorting also appears to have taken place - similar-sized pieces,
e.g. eurypterid carapaces, have often been observed on bedding planes within waterlimes.
LEFT: Erieopterus sp.
Note the reddish color of the
integument of this fine carapace of this
Early Devonian eurypterid (width ~ 2
cm). The carapace is well-rounded and
with very small eyes.
This specimen was collected from the
Early Devonian Clanbrassil Formation
near Dunnville, Ontario, Canada.
BELOW: Hughmilleria socialis The
specimen is preserved in black shale
(Pittsford Member, Vernon Formation,
Salina Group) at Pittsford, New York.
Collected in 2006.
ABOVE: Eurypterus lacustris
Documenting and removing a fine specimen from Williamsville 'A' Waterlime, RQS, Bertie Group of Ontario,
Canada. Note the fine preservation of the integument which often appears as a golden brown color. Natural
joints in the strata facilitate removal of blocks of waterlime - note the joint running right through the specimen.