- from a
different lineal origin.
Pikaia appears to have a proto-
notochord, and
notochords are
present in
several basal chordates such as Haikouella, Haikouichthys...
- and look
rather like gill slits; stomochords,
similar in
composition to
notochords, but
running in a
circle round the "collar",
which is
ahead of the mouth;...
-
members of the
class Mammalia,
which are
classified among animals with
notochords in the
phylum Chordata, and with them
among all
animals in the kingdom...
- is the
defining characteristic of
vertebrate endoskeleton in
which the
notochord (a
flexible collagen-wrapped
glycoprotein rod)
found in all chordates...
-
embryonically and
evolutionarily from the
notochord.
Hagfish are the only
extant vertebrate whose notochord persists and is not integrated/
replaced by...
- Chordata, a
phylum which includes all
animals with
dorsal nerve cords and
notochords (including vertebrates). The
subphylum was at one time
called Urochordata...
-
column (commonly
known as a
spine or backbone),
which evolved from the
notochord. It is a
paraphyletic grouping including all
animals excluding the chordate...
- This
forms the
notochord,
which induces the
formation of the
neural tube, and
establishes the anterior-posterior body axis. The
notochord extends beneath...
- stage,
share the
major chordate characteristics: a
stiffening rod, the
notochord; a
dorsal hollow tube of
nervous material, the
neural tube; pharyngeal...
-
million years ago
during the
Cambrian explosion,
fishlike animals with a
notochord and eyes at the
front of the body, such as Haikouichthys,
appear in the...
