A Synopsis of the Larvae of Costa Rican Frogs and Toads
Of 87 species of Costa Rican frogs and toads with free living larvae, 61 tadpoles are known in sufficient detail to be distinguished. Of the remaining 16 forms, all but two will probably share distinctive combinations of generic features that will allow them to be recognized as previously undescribed tadpoles of an appropriate genus when discovered. A synoptic key to Costa Rican tadpoles that will distinguish larvae from the time the operculum closes through the time of front limb eruption is presented. It is supplemented by a guide to published accounts and illustrations of all described tadpoles of Costa Rican forms.
Savage, Jay M.
"A Synopsis of the Larvae of Costa Rican Frogs and Toads,"
Bulletin of the Southern California Academy of Sciences:
Available at: http://scholar.oxy.edu/scas/vol79/iss2/2