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amphibia

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Amphibia

Amphibia   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
37 words

a class of anamniote vertebrate animals in the superclass Tetrapoda. They are characterized by having gills during the larval stage;

amphibian

amphibian   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
19 words

1 a member of the class Amphibia.

2 adapted for life both on land and in water; amphibious.

amphibian

amphibian   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
67 words

Class of egg-laying vertebrates, whose larval stages (tadpoles) are usually spent in water but whose adult life is normally

Amphibians

Amphibians   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005
Subject:
Science and technology, Life Sciences, Social sciences, Anthropology
Length:
4,277 words
Illustration(s):
4

Amphibians are named for their two-phased life consisting of larva and adult. Typically the larva is aquatic and metamorphoses into

Amphibians

Amphibians   Reference library

The New Encyclopedia of Reptiles and Amphibians (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
15,283 words
Illustration(s):
16

amphibians

amphibians   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Earth Sciences and Geography
Length:
766 words
Illustration(s):
1

Amphibians are tetrapods that still retain a connection to the water because of their need to lay their eggs in

Amphibians and Reptiles

Amphibians and Reptiles   Reference library

The Oxford Encyclopedia of Ancient Egypt

Reference type:
Subject Reference
Current Version:
2005

The Nile River, the Nile Valley, and the surrounding deserts were filled with a variety of amphibians and reptiles—crocodiles, snakes,

aquatic resources

aquatic resources  

The living resources of aquatic habitats, which include fish, invertebrates, and amphibians.
buccal force pump

buccal force pump  

Respiratory system, typical of the Amphibia, whereby air is forced into the lungs by raising the floor of the mouth while the valvular nostril is closed. Compare costal respiration.
cardiac cycle

cardiac cycle  

The series of muscular contractions which squeeze blood through the heart. In Amphibia and higher vertebrates, blood is pumped through a double circulatory system. The right side of the heart pumps ...
crocodile

crocodile  

; subclass Archosauria, order Crocodilia)A family of crocodilians in which the fourth tooth of the lower jaw fits into a notch in the upper jaw, being visible when the mouth is closed. Crocodylus ...
cutaneous respiration

cutaneous respiration  

Breathing through the skin; in some vertebrates the body surface has become highly vascularized for gaseous exchange. Such exchange is of particular importance in the class Amphibia, where mucous ...
Dipnoi

Dipnoi  

A subclass or order of bony fishes that contains the lungfishes, which have lungs and breathe air. They are found in Africa, Australia, and South America, where they live in freshwater lakes and ...
ecdysis

ecdysis  

The periodic shedding of the exoskeleton by some invertebrates, or of the outer skin by some Amphibia and Reptilia.
Eusthenopteron

Eusthenopteron  

(class Osteichthyes, subclass Crossopterygii)A genus of lobe-finned fish, known from the Devonian of Europe and N. America, that exhibited a number of advanced characters (e.g. lungs and strong ...
fauna

fauna  

Reference type:
Overview Page
All the animal life normally present in a given habitat at a given time. See also macrofauna; microfauna. Compare flora.
frog

frog  

1 See Anura; Ascaphidae; Atelopodidae; Centrolenidae; Leiopelmatidae; Leptodactylidae; Microhylidae; Phrynomeridae; Pseudidae; Rhacophoridae.2 (horned frogs) See Pelobatidae.3 (tree frogs) See ...
Frogs and Toads

Frogs and Toads  

FROGS AND TOADS ARE THE MOST NUMEROUS and diverse of the amphibians – about 5,453 species occupy habitats ranging from deserts and savannas to high mountains and tropical rain forests. ...
Gnathostomata

Gnathostomata  

A subphylum or superclass of chordates consisting of all vertebrates that possess jaws. It contains six extant classes: Chondrichthyes (cartilaginous fishes), Osteichthyes (bony fishes), Amphibia, ...
herpetofauna

herpetofauna  

Reptiles (such as snakes, turtles, and lizards) and amphibians (such as frogs, toads, and salamanders).

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