Length: 55 - 90 mm in genus
Mating, ovipositing, and larval development of Gynacantha spp. occur in temporary pools, mud-bottomed pools, and in the water that collects in bromeliads.
Garrison et al. (2006) call Gynacantha an "extremely variable genus."
Most on-line records of Gynacantha membranalis are from Costa Rica and Panama, but there are also records from northern South America.
Photo data (upper two photos): 28 May 2015. Tuis, Cartago, Costa Rica.
Photo data (bottom photo): 22 September 2019. Soberanía National Park, Colón, Panama.