Alien Earthlings

in Drake Bay, Costa Rica



Tracie "The Bug Lady"  invites you  on an out  of this world  walk on...
The Dark Side

Discover the hidden treasures of Drake Bay,  Costa Rica with Tracie "The Bug Lady" .


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Emerald Glass Frog - Cenrtolenella prosobleponCascade Glass Frog - Cochranella albomaculataGranular Glass Frog - Cochranella granulosaCricket Glass Frog - Hylinobatrachium colymbiphyllumDusty Glass Frog - Hylinobatrachium pulveratumReticulated Glass Frog - Hylinobatrachium valerioi
Emerald Glass Frog

Espadarana prosoblepon

Cascade Glass Frog

Sachatamia albomaculata

Granular Glass Frog

Cochranella granulosa

Cricket Glass Frog

Hyalinobatrachium colymbiphyllum

Dusty Glass Frog

Teratohyla pulveratum

Reticulated Glass Frog

Hyalinobatrachium valerioi


The Dusty Glass Frog

 Teratohyla pulveratum

Dusty Glass Frog - Teratohyla pulverata 


Shiny white dots scattered throughout it's top side give this lovely frog the appearance of having been sprinkled with moon dust, explaining it's common name. Adults measure between 22 and 33 millimeters.

Viewed from beneath, the Dusty Glass Frog is completely transparent. It's heart, liver and intestines are covered with a white lining, but the red ventral vein is visible as well as the frog's bluish green bones. Interestingly, a gravid female's unfertilized eggs can also be seen through her transparent belly.

This frog can be found from sea level to 850 meters above sea level on the Caribbean Slope and in the Southern Pacific regions of Costa Rica. Adults live and breed along forested streams.

Males generally frequent the forest canopy and call from perches three to eight meters above fast moving streams and rivers, making encounters a very rare treat.

Groups of calling males may include anywhere from two to five individuals, each one defending it's own territory.


Dusty Glass Frog Eggs - Hyalinobatrachium pulveratumIf a male is successful in attracting a female, they will mate and the female will typically lay her eggs on the upper surface of a leaf overhanging the water.

Clutches include about 50 eggs which are housed in a thick, clear jelly mass about the size of a golf ball. The egg clutch pictured here was photographed in Drake Bay during the month of August.

Unlike many members of it's genus, Dusty Glass Frog males do not appear to partake in parental care. The thick jelly mass surrounding the eggs apparently provides them with some protection from dehydration and predation. 


Dusty Glass Frog - Teratohyla pulverataThis frog's tadpoles were only described by scientists in 2004, here in Costa Rica. As occurs with other glass frogs, the tadpoles of this species have a red coloration.

Because their skin is transparent, it is the red blood in their internal organs which gives tadpoles their color.

After hatching, tadpoles generally squirm from the egg clutch until they fall and sink to the bottom of a stream.

Dusty Glass Frogs - Teratohyla pulverataOnce they reach the bottom, they lodge themselves between rocks and under the leaf litter where they scavenge for the small particles of organic matter on which they feed.



Hoffmann, H.  2004  Description of the previously unknown tadpole of Hyalinobatrachium pulveratum (Anura: Centrolenidea) Available from:

Kubicki, B.  2007  Costa Rica Glass Frogs  Editorial INBio

Leenders, T.  2001  A Guide to Amphibians and Reptiles of Costa Rica  Zona Tropical

Savage, J.  2002  The Amphibians and Reptiles of Costa Rica   University of Chicago Press

Mammals of the Osa Peninsula

The Frog Files

Frogs Home Page

Common Rain Frog - Craugastor fitzingeri

Gaufy Leaf Frog - Agalychnis callidryas

Gladiator Tree Frog - Hypsiboas rosenbergi

Glass Frogs Home Page

Emerald Glass Frog - Centrolenella prosobleponCascade Glass Frog - Cochranella albomaculataGranular Glass Frog - Cochranella granulosaCricket Glass Frog - Hyalinobatrachium colymbiphyllumDusty Glass Frog - Hyalinobatrachium pulveratumReticulated Glass Frog - Hyalinobatrachium valerioi

Gliding Leaf Frog - Agalychnis spurrelli

Hourglass Tree Frog - Dendropsophus ebraccatus

Giant Marine Toad - Bufo marinus

Masked Tree Frog - Smilisca phaeota

Smoky Jungle Frog - Leptodactylus petadactylus

Tink Frog - Diasporus diastema

Salamanders - Order: Caudata



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