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en.wikipedia.org/wiki/Neoteny

Neoteny (/niːˈɒtɪni/ /niːˈɒtni/ or /niːˈɒtəni/, (also called juvenilization) is the delaying or slowing of the physiological (or somatic) development of an organism, typically an animal. .... Ambystoma tigrinum retains its neotenous features for a similar reason, however the retention is permanent due to the lack of resources ...

en.wikipedia.org/wiki/Balanoglossus

Balanoglossus is an ocean-dwelling acorn worm (Enteropneusta) genus of great zoological ... Bateson (1885) included them in Phylum Chordata. ... Balanoglossus is a tuberculos or burrowing and exclusively marine animal. .... According to Newman, Balanoglossus thus retains throughout life a larval organisation while ...

glencoe.mheducation.com/sites/0078675642/student_view0/unit8/chapter29/standardized_test_practice.html

3, An animal that retains its chordate features throughout life is the _____. Need a Hint? ... Which structure in Figure 29-4 is a characteristic only chordates have?

www.flashcardmachine.com/animal-kingdom-testreview.html

Apr 19, 2012 ... The animal's digestive tract form from the ______. ... An animal that retains its chordate features throughout life is the _____.

www.shsu.edu/~bio_mlt/Chap2.html

... derived characteristics of chordates distinguish them from their ancestors: ... these characteristics need not be retained throughout life for an animal to be ...

courses.lumenlearning.com/boundless-biology/chapter/chordates

Animals in the phylum Chordata share four key features: a notochord, a dorsal ... In contrast to the chordates, other animal phyla are characterized by solid ... structures that classify chordates, but adult tunicates retain only pharyngeal slits. ... the four distinctive features of chordates at some point during their development: a ...

www.ucmp.berkeley.edu/chordata/chordatamm.html

All chordates share four basic features. ... This is the notochord , a semi-flexible rod running along the length of the animal. ... All chordates have a notochord at some stage in their lives, but in some (such as tunicates) the notochord is lost in ...

www.encyclopedia.com/plants-and-animals/animals/vertebrate-zoology/chordata

Get information, facts, and pictures about Chordata at Encyclopedia.com. ... The three features unique to chordates and found in all of them at least during early ... into the head and keeps the animal from telescoping when its muscles contract. .... Throughout life, hagfish and lamprey retain the notochord, a supporting ...

www.zoology.ubc.ca/~millen/vertebrate/Bio204_Labs/Lab_1__Introduction.html

This marine animal looks very fish-like with fins, a tail, muscle blocks called ... This is the one group that retains the Chordate characteristics throughout its life.