Thursday, April 14, 2016

Giant Treefrog, Hypsiboas boans (Family Hylidae)

Rana boans Linnaeus, 1758, Syst. Nat., Ed. 10, 1: 213. Type locality: "America".

Rana maxima Laurenti, 1768, Spec. Med. Exhib. Synops. Rept.: 32.

Hyla boans — Daudin, 1800, Hist. Nat. Quad. Ovip., Livr. 1: 11;

Hypsiboas boans — Faivovich, Haddad, Garcia, Frost, Campbell, and Wheeler, 2005, Bull. Am. Mus. Nat. Hist., 294: 89.

Type locality: "America.” Distribution. Eastern Panama to Trinidad, upper Orinoco, Lower Amazon Basin, the Magdalena Basins, Guianas, and Pacific lowlands of Colombia and adjacent Ecuador in South America.

T&T's largest treefrog. Males slightly larger than females, males 101-128 mm, females 91-123 mm. Commonly found in gallery forests along streams, often associated with stands of bamboo and other tall grasses. Males may construct nests in stream bed during dry season, and defend egg laying sites from other males. The dorsum is brown in males and orange-brown in females. The ventral surface is a uniform cream to white in both sexes. Transverse darker bars occur on the sides of the body and legs. The membrane between the fingers is complete to the start of the terminal segment of the finger. The iris is orange brown.

A highly arboreal frog that is nocturnal, reproduction occurs at the end of the dry season. Clutches of 1300-3000 eggs are deposited as a gelatinous film on the water surface in nest basins constructed by the male, nest basins usually streamside and flooded with rains. Male combat occurs over nesting sites. Males use an exposed bones on their thumb to fight. The tadpoles are light brown and on sand or gravel bottom streams. Fish seem to avoid eating the tadpoles.









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