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amphibia

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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  

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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).
herpetology

herpetology  

The branch of zoology concerned with the study of reptiles and amphibians, which are sometimes collectively known as herps or herptiles.
Labyrinthodontia

Labyrinthodontia  

(class Amphibia)A group (or subclass) comprising amphibians that were primitive in character and from a few centimetres to several metres long. The bones forming the palate often carried the folded ...
larva

larva  

The preadult form in which some animals hatch from the egg. A larva is capable of feeding, though usually on a diet different from the adult, and is usually incapable of sexual reproduction.
lateral line

lateral line  

A system of receptors, often embedded in special grooves in the skin of an animal, that is capable of detecting vibrations (and therefore movements) in the water surrounding the animal. In most fish, ...
mesolecithal

mesolecithal  

Applied to an egg that has a yolk of intermediate size and strongly concentrated in one hemisphere, typical of Petromyzonidae, Acipenseridae, Amiidae, Lepidosirenidae, and Amphibia. Compare ...
metamorphosis

metamorphosis  

The transformation from larval to adult form. In Drosophila the destruction of larval tissues and their replacement with adult ones is triggered by 20-hydroxy-ecdysone. See ecdysones.
neuromast

neuromast  

In fish and some Amphibia, the basic receptor units of the acoustico-lateralis system. The receptor cells are surrounded by a clump of supporting cells, the units being covered by a gelatinous ...

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