Two articles, which might be of interest for you:

Karl-Heinz Jungfer (1996): Reproduction and parental care of the coronated treefrog, Anotheca spinosa (Steindachner, 1864) (Anura: Hylidae). Herpetologica 52(1): 25-32.

SOFÍA RODRÍGUEZ-BRENES et al. (2013): Reproductive Behavior of Anotheca spinosa (Anura: Hylidae) Under Natural Conditions in Costa Rica. Herpetological Review, 2013, 44(1), 54–56.


BTW, how large is your group? Adults or juvenils?