Page 184 - Ultimate Visual Dictionary (DK)

ANIMALS

Amphibians

THE CLASS AMPHIBIA INCLUDES FROGS and toads (which make INTERNAL ANATOMY
OF A FEMALE FROG
up the order Anura), and newts and salamanders (which make
up the order Urodela). Amphibians typically have moist,
scaleless, hairless skin; lungs; and are cold-blooded. Larynx
They also undergo complete metamorphosis, from
Right bronchus Stomach
eggs laid in water through various water-living
larval stages (such as tadpoles) to land-living
adults. Typical features of adult frogs and
toads include a squat body with no tail; long,
powerful hind legs; and large, often bulging,
eyes. Adult newts and salamanders typically
have a long body with a well-developed
tail; and relatively short, equal-sized legs.
Pulmonary
However, newts and salamanders show artery
considerable variation; for example, in Right lung
some species the adults have minute Left lung
Heart
legs, external gills rather than lungs, Pancreas
and spend their entire lives in water. Liver
Duodenum
Posterior vena cava
Spleen
EXTERNAL FEATURES Right kidney
OF A FROG Left kidney
Trunk Dorsal aorta
Hind limb Mesentery

Head Cloaca Small intestine
(ileum)
Rectum
Left ureter
Forelimb

External
nostril
5 digits Mouth

Tympanum Eye
(eardrum)
Web
4 digits

EXTERNAL FEATURES OF A
SALAMANDER Eye

Tail Forelimb
Hind limb Digit

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