-
Cyclostome is a
biological term (from the Gr**** for "round mouth") used in a few
different senses: for the
taxon Cyclostomi,
which comprises the extant...
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consisting of both
living (
cyclostomes) and
extinct (conodonts, anaspids, and ostracoderms) species.
Among recent animals,
cyclostomes are
sister to all vertebrates...
- with jaws (called gnathostomes) than to
cyclostomes.
Biologists historically disagreed on
whether cyclostomes are a clade. The "vertebrate hypothesis"...
- the
evidence provided by
Heimberg et al. and
prepared to
admit that
cyclostomes are, in fact, monophyletic. The
consequence is that they may tell us...
- fish
became extinct during the Tri****ic period.
However studies of the
cyclostomes, the
jawless hagfishes and
lampreys that did survive, have
yielded little...
-
large notochord as adults, and pouch-shaped
gills (Marspibranchii).
Cyclostomes were
regarded as
either degenerate cartilaginous fishes or primitive...
- to the
gnathostomes than to the
surviving agnathans,
known as
cyclostomes.
Cyclostomes apparently split from
other agnathans before the
evolution of dentine...
- Agnatha/
Cyclostomes...
-
unanimously in
consensus of
cyclostome monophyly, with more
recent work
being directed at
shared microRNAs between cyclostomes and gnathostomes. The current...
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intervertebral discs. In
other taxa, such as chondrichthyans, but also in
cyclostomes, it may
constitute a much
greater proportion of the skeleton. It is not...
