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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...

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 _____.

Morphology of the Chordata


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.

Biology of chordates video guide.


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 the adult...

The Invertebrate Animals - Kimball's Biology Pages


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 life.

What's a Tunicate?


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...

Amphioxus and the evolution of the chordate genome – Pharyngula


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 ...

Chapter 48: Vertebrates


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 animal's life.

Chapter Synopsis - McGraw Hill Higher Education


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 l...

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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.

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 ...

chordate | animal phylum | Britannica.com


As the name implies, at some time in the life cycle a chordate possesses a stiff, dorsal ... Vertebrates retain traces of a feeding apparatus like that of tunicates and cephalochordates. ... In its primitive form, fertilization occurs externally, in the water. .... animals possess gill slits and other features not found in other animal ...