Geckos (Suborder Gekkota: the geckos and pygopodids) are an extremely diverse and species rich group. Geckos comprise about 14% of all reptile species with approximately 1300 described species in 108 genera. Geckos are widely distributed in both the eastern and western hemispheres and can be found on numerous oceanic islands.
Geckos are perhaps best known for their climbing abilities. Specialized scales on their feet, known as setae, allow geckos to climb on a variety of surfaces, including glass. Individual seta possess branching, spatula-like projections at the tip. The contact of the finely branched setae with a surface produces millions of weak molecular attractions allowing the gecko to stick. Gecko feet never lose their “stickiness”. In fact, dead geckos still retain the ability to stick!
Hemidactylus garnotii toe
Phelsuma grandis
Geckos are the only lizards to regularly vocalize. Many species use a series of short chirps in a variety of social interactions. Most geckos are nocturnal although there are some exceptions and diurnality seems to have evolved independently several times (e.g. Cnemaspis, Sphaerodactylus, Gonatodes, Lygodactylus, Narudasia, Phelsuma, Quedenfeldtia, and Rhoptropus).
Reproductive traits in geckos are extremely varied. Nearly all geckos are oviparous (egg-layers) with the exception of Naultinus, Hoplodactylus, and Rhacodactylus trachyrhyncus which are viviparous (live-bearing). Oviparous geckos may lay hard-shelled eggs (e.g. Sphaerodactylidae and Gekkonidae) or soft-shelled eggs (e.g. Diplodactylidae, Carphodactylidae, Pygopodidae, and Eublepharidae). Most geckos reproduce sexually although there are some parthenogenetic forms such as Lepidodactylus lugubris, Heteronotia binoei, Nactus pelagicus, and several species of Hemidactylus which consist of all-female popuulations. Geckos posses both genetic sex determination (e.g. Coleonyx, some Gekko, pygopodids), with either male or female heterogametey, and temperature-dependant sex determination (e.g. Eublepharis macularius, Hemitheconyx caudicinctus and Phelsuma madagascariensis).
Gekko gecko
Pachydactylus gaiasensis
GECKO PHOTOS
Click on the names below to see photos of representative species from each of the seven gecko families. Photos of over 150 gecko species in all!
