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superfamily of eurypterids, an
extinct group of
aquatic arthropods.
Pterygotioids were the most
derived members of the
infraorder Diploperculata and the...
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families Pterygotidae and Slimonidae.
Despite their classification as
pterygotioids, the
hughmilleriids possessed several characteristics shared with other...
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Herefordopterus fossils.
Herefordopterus is
classified in Hughmilleriidae, a
pterygotioid family that is
differentiated by
their streamlined bodies, the enlargement...
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distinguished primarily by
sharing several features with more
basal pterygotioid eurypterids, such as its
appendages being similar to
those of Slimonia...
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close relationship between the two groups.
Slimonids are
defined as
pterygotioid eurypterids with
swimming legs
similar to
those of the type genus, Slimonia...
- been
noted as
possessing a mix of
features from both more
primitive pterygotioids such as
Slimonia and more
derived members of the
group firmly within...
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Herefordopterus they were
completely marginal, a
feature present in all
pterygotioid genera. In addition, the
triangular anterior carapace margin present...
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Fossil of Jaekelopterus, a
pterygotioid. At a
length of 2.5 meters, it is one of the
largest arthropods to have ever lived....
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Vernon Formation, New York. This
species is the most
abundant species of
pterygotioid in the area with
around 450
specimens found. The
generic name derives...
- had a
distribution similar to the
cosmopolitan distribution of the
pterygotioids,
though they were not as
common nor as successful. The Carcinosomatoidea...
