Frog Morphology Short Notes | Free Biology Notes

In this article we will discuss about the Frog Morphology

Frog Morphology

• Rana tigrina is the most common species of frog
• They are poikilotherms or cold blooded
• Frog is almost cosmopolitan nearby watery areas
• Frogs use camouflage to avoid predators
• The summer sleep of the frog is known as aestivation
• The winter sleep of the frog is known as hibernation
• The sound made by the male frog during breeding season is called croaking. It is a call for mating
• Size varies from 18 to 20cm in length and 5 to 8cm in width
• Body of frog is adapted for burrowing, jumping and swimming
• The frog never drinks water but absorb it through the skin
• The body of the frog is divided into head and trunk
• Both neck and tail are absent

Head

• Head is triangular & its anterior conical part is called snout
• Two openings are present tip of snout is called nostrils
• Pair of nostrils helps in respiration
• On top of head pair of eyes are present. In eyes upper eyelid is immovable, lower eyelid is freely moveable and nictitating membrane arises from lower eyelid
• Frog lacks external ear. The ear drum or tympanum is present behind and below each eye
• In male vocal sacs are present, croaking during breeding season

Trunk

• Head is broadly joined behind with the flat trunk
• Two pairs of limbs are attached to its trunk

Fore limb

• The fore limb is shorter than the hind limb
• Fore limbs that end in four digits
• In male frog ventral side of first digit copulatory pad enlarge during breeding season
• This pad help the male frog to grip the female during copulation

Hind limb

• They are larger and muscular
• The hind limbs end in five digits
• They have webbed digits that help in swimming