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Amplexus (Latin "embrace") is a form of pseudocopulation in which a male amphibian or limulid grasps a female with his front legs as part of the mating process. At the same time or with some time delay, he fertilizes the female eggs with fluid containing sperm. Amplexus chiefly occurs aquatically, but limulids and some more terrestrial anurans like the disc-tongued frogs (Discoglossidae) perform amplexus on land. In more advanced anurans like the true frogs (Ranidae), the tree frogs (Hylidae), and the true toads (Bufonidae), the amplexus is axillary (in the armpits), while in less derived anurans (the Archaeobatrachia) and frogs in the family Myobatrachidae, it is lumbar (abdominal, in front of the hindlegs).