Origin and Diversity of Amphibians

Amphibians evolved from lobe-finned fishes, adapting to land with legs and lungs. They first appeared 370 million years ago and now include over 6000 species across three orders: Anura, Eurodella, and Apoda. Anura includes frogs and toads, with differences in skin texture. Eurodella consists of salamanders and newts, characterized by elongated bodies and tails. Apoda are legless, tropical soil-dwelling amphibians. Amphibian populations are declining, raising environmental concerns.

What adaptations did amphibians develop to thrive on land?

• Wings and feathers

• Gills and fins

• Legs and lungs

• Scales and claws

Approximately how many species of amphibians exist today?

• Over 6000

• Over 3000

• Over 1000

• Over 9000

Which order do frogs and toads belong to?

• Eurodella

• Apoda

• Reptilia

• Anura

What is a key difference between frogs and toads?

• Frogs have long tails, toads have short tails

• Frogs have smooth moist skin, toads have dry bumpy skin

• Frogs live in dry environments, toads need moist environments

• Frogs have dry skin, toads have moist skin

What is a major environmental concern regarding amphibians today?

• Increased habitat range

• Declining populations and extinction

• Overpopulation

• Excessive breeding