Читать книгу Blackwell's Five-Minute Veterinary Consult: Reptile and Amphibian - Javier G. Nevarez - Страница 57

Amphibians have paired gonads consisting of either testes – Wolffian duct – cloaca, or ovaries – coelom – infundibulum – oviduct.

The Bidder’s organ is a remnant of ovarian tissue in male bufonid frogs and does not indicate hermaphroditism. Salamanders have internal fertilization but lack an intromittent organ. Instead, sperm packets are deposited on the environment to be picked up by the female. The exceptions are the Asiatic salamanders and giant salamander, which deposit sperm on egg masses. Caecilians have internal copulation and fertilization with a phallodeum for intromission and 75% are viviparous.

Examples of sexual dimorphism:

 bullfrogs—males have large tympanic membranes

 White’s tree frogs—males have nuptial pads during breeding season

 dyeing arrow frogs—males have large triangular toes, females have small, round toes

 red‐eyed tree frogs—males are smaller.