There are a total of 250 Amphibians that have been compiled and organized in this comprehensive list. The selection includes well-documented species with currently accepted scientific names, concise habitat descriptions, and verified lifespan ranges drawn from authoritative databases.

Amphibians are cold-blooded vertebrates that typically live both in water and on land during parts of their life cycle. They include frogs, toads, salamanders, newts, and caecilians, ranging from tiny tropical tree frogs to large salamanders. Many undergo metamorphosis from gilled larvae to air-breathing adults. Amphibians serve as predators and prey, act as environmental indicators, and provide models and compounds used in medicine and conservation research.

Interesting and little-known facts about Amphibians:
– There are more than 8,000 described amphibian species worldwide, with new species still being described each year.
– About 40–41% of assessed amphibian species are threatened with extinction, a higher rate than many other vertebrate groups.
– Some salamanders can live for decades; several species, including the olm and some giant salamanders, have reported lifespans over 50 years.
– Amphibian skin secretes potent compounds; peptides from species like Xenopus have inspired antibiotic and pharmaceutical research.
– Fossil and molecular evidence indicate amphibians first appeared around 370 million years ago and later diversified into the main modern groups.

The alphabetical index is organized by letter, with a dedicated list for each initial.
Each letter list includes columns for scientific name, common name, habitat, lifespan (years), conservation status, distribution, and source links.