Which salamander suborder uses external fertilization?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Study an amphibious tiger salamander of the mole salamander family Ambystomatidae in its natural habitat — Caudata Tiger salamanders (*Ambystoma tigrinum*) are widespread across much of the United States. Although they are generally black with yellow blotches, bars, spots, or even stripes, some are lighter in colour or have olive markings. Tiger salamanders belong to the mole salamander family, Ambystomatidae.

Within the order Caudata, the suborder Cryptobranchoidea is characterized by external fertilization. In these species, females deposit eggs in sacs or strings, and the male sheds milt—which contains the sperm—directly over them.12

In contrast, all other salamander species typically utilize internal fertilization, often involving the use of a spermatophore, or sperm case, which the female takes into her cloaca.12