Gekkonidae

Gekkonidae is the largest family of geckos on our planet. This group includes over 950 different species. These species are organized into 62 distinct genera. Many famous geckos belong to this family.

You might recognize the tokay gecko or the bright day geckos. Other members include house geckos and mourning geckos. This family is incredibly important for understanding reptile diversity. They are found all over the globe. Most species prefer to live in warm, tropical environments.

One of the most amazing things about many gekkonids is how they climb. They can adhere to many different surfaces with ease. This ability comes from tiny, microscopic hairs on their feet. Scientists call these hairs setae. These setae work through a process involving Van der Waals forces. These are intermolecular forces that occur between molecules. The molecules in the setae pull on the molecules of the surface. This creates a strong bond that allows the gecko to walk on walls. This mechanism is a key part of their survival.

Geckos have a deep history that spans millions of years. The infraorder Gekkota likely emerged during the Jurassic period. This was between 200 and 145 million years ago. One early ancestor was called Eichstaettisaurus schroederi. This species showed morphological adaptations for climbing. This means its body shape was suited for life on vertical surfaces. While it is considered a stem gekkotan, its exact taxonomic rank remains unclear.

As time passed, more specific gekkotan species appeared in the fossil record. During the Cretaceous period, species like Hoburogekko suchanovi lived. Another species, Gobekko cretacicus, lived during the Albian-Aptian ages. These lived between 121 and 100 million years ago. Scientists believe these were members of the Gekkota group. They might also belong to the Gekkonidae family. However, the fossil remains are incomplete. This makes it difficult to be certain about their exact classification.

The earliest known member of the Gekkonidae family is Yantarogekko balticus. This tiny gecko was discovered inside Baltic amber. This amber dates back to the Eocene epoch. That was between 56 and 33.9 million years ago. This species was very small in size. It measured only 20 to 22 mm from its snout to its vent.

It had several unique physical traits. It possessed enlarged, undivided scansorial pads on its feet. It also had a reduced but strongly clawed first digit. Notably, it lacked movable eyelids. These traits suggest it may have used adhesion just like modern geckos.

Today, Gekkonidae species inhabit every warm region of the world. Their distribution patterns vary greatly between different groups. Some genera are endemic to specific locations. An endemic group is one that is found in only one place. For example, the genera Afroedura and Afrogecko are found only in Africa. Other groups have much wider ranges. The genus Lepidodactylus stretches from South Asia all the way to Oceania. This group includes many species that live on various islands.

Some geckos are also very successful at spreading to new areas. The genus Hemidactylus is one of the most species-rich reptile genera. It is also one of the most widely distributed. You can find Hemidactylus in all subtropical areas of the world. Because they spread so well, they can sometimes be considered invasive. This means they move into new areas where they were not originally from. This ability to spread makes them a dominant force in many warm ecosystems. Their presence shows how successful the Gekkonidae family has become over time.