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A pair of clicking stream frogs (Strongylopus grayii) in amplexus Orange-thighed frogs (Litoria xanthomera) in amplexusAmplexus (Latin "embrace") is a type of mating behavior exhibited by some externally fertilizing species (chiefly amphibians and horseshoe crabs) in which a male grasps a female with his front legs as part of the mating process, and at the same time or with some time delay, he ...
These are the only North American frog species that reproduce by internal fertilization. [3] They are among the most primitive known families of frogs. Its scientific name means 'without a spade', from the privative prefix a- and the Ancient Greek skaphís ( σκαφίς , 'spade, shovel'), referring to the metatarsal spade, which these frogs ...
"Fewer than a dozen of the 6455 species of frogs in the world are known to have internal fertilization, and of these, all but the new species either deposit fertilized eggs or give birth to froglets."
External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization , in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
The pickerel frog is a medium sized gray or tan frog marked with seven to twenty-one irregular rectangular dark brown spots which are oriented in two columns down its back. [3] The distinctive rectangular spots of the pickerel frog may blend together to form a long rectangle along the back. All leopard frogs have circular spots. In addition ...
Species of the genus are ovoviviparous: fertilization is internal, and the females give birth to fully developed, small toadlets. [2] Together with the West Africa Nimbaphrynoides (which was included in Nectophrynoides in the past) and Limnonectes larvaepartus , they are the only frogs/toads in the world that do not lay eggs.
Limnonectes larvaepartus is a species of fanged frog in the family Dicroglossidae endemic to northern and western Sulawesi, Indonesia. [2] It is unique in that it has internal fertilization and gives live birth to tadpoles. [1] Other frog species that have live birth produce froglets.
What makes these frogs unique among all frog species is their form of parental care. Following external fertilization by the male, the female would take the eggs or embryos into her mouth and swallow them. [10] It is not clear whether the eggs were laid on the land or in the water, as it was never observed before their extinction.