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Neoteny - Wikipedia


The retention by adults of traits previously seen only in the young is important in developmental biology, and consequently in evolution. It occurs in two ways. In neoteny (/niːˈɒtᵻ...

Echinoderms and Invertebrate Chordates


Chapter 29: Echinoderms and Invertebrate Chordates. Echinoderms ... 3. An animal that retains its chordate features throughout life is the _____. Need a Hint ?

Chordates and the Evolution of Vertebrates - Boundless


Chordata contains two subphylums of invertebrates: Urochordata (tunicates) and ... Seawater enters the tunicate's body through its incurrent siphon. ... Adult lancelets retain the four key features of chordates: a notochord, a dorsal hollow nerve ... of Animal Life, Characteristics of Vertebrates, and Characteristics of Chordata.



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

Morphology of the Chordata


Chordates derive their name from one of their synapomorphies, or derived ... This is the notochord , a semi-flexible rod running along the length of the animal. ... Pharyngeal slits are a third chordate feature; these are openings between the ...

chordate | animal phylum | Britannica.com


Mar 30, 2012 ... Vertebrates retain traces of a feeding apparatus like that of tunicates and cephalochordates. ... The chordate life cycle begins with fertilization (the union of sperm and egg). In its primitive form, fertilization occurs externally, in the water. .... possess gill slits and other features not found in other animal phyl...

Branches on the Tree of Life: Chordates - BioMEDIA Associates


In tunicates, the chordate characteristics can be observed only by examining the ... A related group, the larvaceans (Appendicularians), live throughout the life cycle ... They stick their heads out of the sand and feed somewhat like a tunicate. ... brief periods of swimming, such as when the animal is dislodged from the sand .

Notochord - New World Encyclopedia


Nov 21, 2008 ... The higher chordates were built on the foundation of this model ... defining characteristics of the phylum Chordata, along with the presence of a hollow ... Lancelets (suphylum Cephalochordata) retain the notochord throughout their lives ... the hagfish and lampreys, the notochord remains throughout life and ...

Chapter Synopsis - McGraw Hill Higher Education


... 36: Chemical Coordination, Chapter 37: Immunity, Chapter 38: Animal Behavior ... For simplicity, however, this text retains the traditional Linnaean classification, but ... These characteristics are found in all chordates at some stage of their life ... In the protochordates and jawless vertebrates, it is persistent throughout life...

protochordates, vertebrate phylogeny and embryology


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.

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Animal Kingdom Test Review Flashcards


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

Characteristics of Chordata - Boundless


Animals in the phylum Chordata share four key features: a notochord, a dorsal ... The notochord provides skeletal support, gives the phylum its name, and develops ... acts as the primary axial support of the body throughout the animal's lifetime. ... The Cambrian Explosion of Animal Life, and Characteristics of Vertebrates.

Chordata facts, information, pictures | Encyclopedia.com articles ...


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 ...