Neoteny also called juvenilization, is one of the two ways by which
paedomorphism can arise. .... The axolotl is a neotenous salamander, retaining
gills throughout its life. ... Ambystoma tigrinum r...
Apr 19, 2012 ... The animal's digestive tract form from the ______. ... An animal that retains its
chordate features throughout life is the _____.
Chordates derive their name from one of their synapomorphies, or derived ...
which lack bone, muscles work against the notochord to move the animal. ... The
notochord runs beneath the dorsal nerve cord, which is another chordate feature.
Four distinctive derived characteristics of chordates distinguish them from their ...
and must obtain food by siphoning sea water through its body and trapping food
... not be retained throughout life for an animal to be considered a chordate.
characteristics can only be seen during a relatively small portion of the life ...
embryonic or larval stage, when the animal is difficult to observe). ... throughout
the life cycle as .... developing embryo, and removes its wastes, through an
exchange ... of chordates retains all of the four basic chordate characteristics in
Before the Cambrian was far along, most of the animal phyla had appeared. So
each of ... and Ecdysozoans, Echinoderms, Acorn worms, and Chordates .... In
addition to the features listed above, the deuterostomes have (or had) gill slits. ...
Amphioxus retains: a dorsal nerve cord; notochord and; gill slits. throughout its
It even looks like a tiny tadpole, and has a nerve cord down its back, similar to the
... to detect light, and an otolith, which helps the animal orient to the pull of gravity.
... tail and recycle them to build new structures needed for their adult way of life. ...
intricate mucous "houses" and retain their larval tail throug...
Jun 26, 2008 ... The notochord extends all the way to the front of the animal (in us ... They seem
so primitive, with a mixture of features that are clearly ... A major difference,
though, is that amphioxus maintains its chordate morphology throughout its life ....
but a segment that retains enough signal above the noise of ages of ...
the body, with muscles attached to its inner surface. Chor- ... All chordates have
all four of these characteristics at some time .... which retains the tail and
notochord ... tire length of the dorsal nerve cord and persists throughout the
For simplicity, however, this text retains the traditional Linnaean classification, ...
Most zoological texts follow the traditional approach because of its ease and
familiarity. ... The four chordate characteristics are the notochord, dorsal tubular
nerve ... In the protochordates and jawless vertebrates, it is persistent throughout