- from a
different lineal origin.
Pikaia appears to have a proto-
notochord, and
notochords are
present in
several basal chordates such as Haikouella, Haikouichthys...
- subphyla:
Vertebrata (fish, amphibians, reptiles,
birds and mammals),
whose notochords are
replaced by a cartilaginous/bony
axial endoskeleton (spine) and are...
- 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...
-
floor plate and
diverse ventral cell
types within the
neural tube. The
notochord—a
structure derived from the
axial mesoderm—produces SHH,
which travels...
-
characterised by five
synapomorphies (unique characteristics),
namely a
notochord, a
hollow nerve cord
along the back, an
endostyle (often as a thyroid...
- slow-growing
neoplasm thought to
arise from
cellular remnants of the
notochord. The
evidence for this is the
location of the
tumors (along the neuraxis)...
-
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...
-
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...
-
sclerotomes shift their position to
surround the
spinal cord and the
notochord. This
column of
tissue has a
segmented appearance, with
alternating areas...
