We don't have synonyms for amplection yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ampliation, impletion and complection.
(n) :
(biology, dated, uncommon) A form of pseudocopulation, found chiefly in amphibians and horseshoe crabs, in which a male grasps a female with his front legs; amplexus.
(n) :
(biology, dated, uncommon) A form of pseudocopulation, found chiefly in amphibians and horseshoe crabs, in which a male grasps a female with his front legs; amplexus.