Márquez, I., C. Señaris, O. Ballestas, K. González, C. Buttermore, J. Mesa, F. Pantin, T. Hernández & M. Lampo

Embryonic and larval development of the Neotropical harlequin toad Atelopus cruciger (Anura: Bufonidae) from Venezuela. pp. 129-139.

Abstract. Harlequin toads (Atelopus) are one of the amphibian groups in greatest need of urgent conservation measures. Atelopus cruciger is one of the few species with known stable populations, yet its basic natural history, including the embryonic and larval stages, remains largely unknown. We describe for the first time the development of its tadpole, from egg to tail resorption. The tadpole of Atelopus cruciger is gastromyzophorous with a general morphology resembling that for other congeneric species but with a distinct W-shaped whitish band that spans transversely across the midline of its dorsum. Development from egg to tail resorption takes 110–147 days. In the wild, tadpoles live camouflaged beneath and alongside rocks in shallow sections of fast-flowing streams, with clear soft waters.

Key words. Amphibia, ex-situ conservation, gastromyzophorous, Rancho Grande harlequin toad, tadpoles.