-
youngest known eurypterid. No
eurypterids are
known from
fossil beds
higher than the Permian. This
indicates that the last
eurypterids died
either in...
- in at
least some
eurypterids.
Though sometimes, and
often historically,
treated as
distinct genera, the
hibbertopterid eurypterids Cyrtoctenus and Dunsopterus...
-
formation was,
unlike the
typical living environments of
eurypterids (especially the
swimming eurypterids of the
suborder Eurypterina), a
freshwater environment...
-
Diploperculata in the
suborder Eurypterina.
Adelophthalmid eurypterids were
small and
swimming eurypterids that
appeared in the
Silurian period. With the earliest...
- the
extinct eurypterids had gills, but the
fossil evidence was ambiguous. However, a
fossil of the 45
millimetres (1.8 in) long
eurypterid Onychopterella...
- are no
longer considered eurypterids. The list
currently includes 115
names out of
which 74 are
considered valid eurypterid genera.
There are approximately...
- some of the
oldest known eurypterids, such as Brachyopterus, from the
Middle Ordovician as well as the
youngest known eurypterids, from the Late Permian...
- as part of the
pterygotid family of
eurypterids, to
which it
lends its name, a
group of
highly derived eurypterids of the
Silurian to
Devonian periods...
-
final genus of the
Eurypterina suborder of
eurypterids and
consisted the only
known genus of
swimming eurypterids from the
Middle Devonian until its extinction...
-
Until recently,
eurypterids were
thought to
belong to the
class Merostomata along with
order Xiphosura. It is now
believed that
eurypterids are a sister...
