-
Chasmataspidids,
sometime referred to as chasmataspids, are a
group of
extinct chelicerate arthropods that form the
order Chasmataspidida. Chasmataspidids...
- existed, and the two may be
sister groups. The difficult-to-classify
chasmataspidids are also
thought to be
closely related to
horseshoe crabs. The radiation...
- crabs) and
Planaterga (a
group comprising bunodids, pseudoniscids,
chasmataspidids,
eurypterids and arachnids), as well as
several basal synziphosurid...
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Chasmataspis is a
genus of
chasmataspidid, a
group of
extinct aquatic chelicerate arthropods. It was
found in the
Early Ordovician deposits of Tennessee...
-
Kiaeria is a
genus of
chasmataspidid, a
group of
extinct aquatic arthropods. It was
originally classified as a
xiphosuran of the
monotypic family Kiaeriidae...
-
Dvulikiaspis is a
genus of
chasmataspidid, a
group of
extinct aquatic arthropods.
Fossils of the
single and type species, D. menneri, have been discovered...
- pseudoniscids) and the
group Dekatriata (which in turn
includes arachnids,
chasmataspidids and eurypterids).
Planaterga is
defined by the
opisthosoma with tergites...
-
number of
extinct lineages, such as the
eurypterids (sea scorpions) and
chasmataspidids.
Chelicerata split from
Mandibulata by the mid-Cambrian, as evidenced...
-
Forfarella is a
genus of
chasmataspidid, a
group of
extinct aquatic arthropods.
Fossils have been
discovered in
deposits of the
Early Devonian period....
- for the latter).
Unlike most of
dekatriatans like
eurypterids and
chasmataspidids, the
metastoma (ventral
plate in
front of opisthosoma) of
Houia is...
