Observations in nature and captivity reveal that members of the population of Rhinoclemmys areolata of western Tabasco, Mexico, exhibit underwater courtship and mating and appear to lay one egg per nest.
Pérez-Higareda, Gonzalo and Smith, Hobart M.
"Courtship behavior in Rhinoclemmys areolata from western Tabasco, Mexico (Testudines: Emydidae),"
Great Basin Naturalist: Vol. 48
, Article 14.
Available at: http://scholarsarchive.byu.edu/gbn/vol48/iss2/14