-
family of eurypterids, an
extinct group of
aquatic arthropods. The
hughmilleriids were the most
basal members of the
superfamily Pterygotioidea, in contrast...
-
adelophthalmoid eurypterids. The
group includes the
basal and
small hughmilleriids, the
larger and
specialized slimonids and the
famous pterygotids which...
-
characteristics that
Slimonia and
Ciurcopterus share,
suggest that the
hughmilleriids were more
distant from the
pterygotids than
Slimonia was.
Within Hughmilleriidae...
-
opisthosomal segments (a
feature for the most part
missing among the
hughmilleriids) and its eyes not
being placed on the
margin of the carapace. The deposits...
- the
superfamily Adelophthalmoidea. It was
originally described as a
hughmilleriid, but
since then it has been
considered closer to
Adelophthalmus than...
-
Salteropterus partially lacks the
appendage spinosity noted in the two
hughmilleriid genera,
which possess paired spines on four to five of
their podomeres...
- in the Tuscarora, and most of them are
trace fossils. At
least two
hughmilleriid Eurypterids (sea scorpions) have been
discovered in the Tuscarora. Relative...
- bays. The
third and
final recognized type of
fauna is one
dominated by
hughmilleriids and stylonurids,
generally alongside sandy bottoms and with few other...
-
characteristics that
Slimonia and
Ciurcopterus share,
suggest that the
hughmilleriids are more
distant from the
pterygotids than
Slimonia is.
Within Hughmilleriidae...
-
unites them as a
group and
showcases that they are more
derived than the
hughmilleriids, on
which spines appear on four to five of
their podomeres (leg segments)...
