Hemidactylus

Hemidactylus is a genus of the common gecko family, Gekkonidae. It has 168 described species, newfound ones being described every few years. These geckos are found in all the tropical regions of the world, extending into the subtropical parts of Africa and Europe. They excel in colonizing oceanic islands by rafting on flotsam, and are for example found across most of Polynesia. In some archipelagoes, cryptic species complexes are found.[2] Geckos like to live in and out of houses. They have been introduced to Australia.

Hemidactylus
Mediterranean house gecko, (Hemidactylus turcicus)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Gekkonidae
Subfamily: Gekkoninae
Genus: Hemidactylus
Oken, 1817[1]
Type species
Gecko tuberculosus
Raddi, 1823
Diversity
168 species, and see text
Synonyms

In alphabetical order:

  • Aliurus E.R. Dunn & M.T. Dunn, 1940
  • Boltalia Gray, 1842
  • Bunocnemis Günther, 1894
  • Cosymbotus Fitzinger
  • Doryura Gray, 1845
  • Emydactylus Bocourt, 1870
  • Eurhous Fitzinger, 1861
  • Hoplopodion Fitzinger, 1843
  • Leiurus Gray, 1845 (non Ehrenberg, [1828]: preoccupied)
  • Liurus Cope, 1862 (non Ehrenberg, 1831: preoccupied)
  • Lophopholis M.A. Smith & Deraniyagala, 1934
  • Microdactylus Fitzinger, 1843 (non É. Geoffroy Saint-Hilaire, 1809: preoccupied)
  • Nubilia Gray, 1845
  • Onychopus Fitzinger, 1843
  • Pnoepus Fitzinger, 1843
  • Tachybates Fitzinger, 1843
  • Velernesia Gray, 1845

[2]

The species are typically known as house geckos, due to their readiness to adapt to and coexist with humans, and can be easily encountered in human habitations. This genus was originally established by Lorenz Oken in 1817 for the species at that time known as Hemidactylus tuberculosus, and now described as the tropical house gecko (Hemidactylus mabouia).[2]

This species is closely related to the genus Gehyra, which belongs to the same Gekkonidae family.

Evolution

The origin of the genus Hemidactylus is still unclear as the higher level phylogeny is not well resolved. Moreover, much of the diversity in this group still remains to be discovered.

Feces

A house gecko will usually confine its excretions to one area of a house. This is sometimes considered a nuisance by home owners, and may stain certain surfaces.[3] The feces are approximately five (5) millimeters in length, two (2) millimeters wide, and dark brown (almost black) in color.

Description
Foot upperside (left) and underside of the Oriental leaf-toed gecko (H. bowringii).

The dorsal lepidosis is either uniform or heterogeneous. The pupil of the eye is vertical. Males have pre-anal or femoral pores. Each finger or toe has a slender distal clawed joint, angularly bent and rising from within the extremity of the dilated portion.[4]

The fingers and toes are free, or more or less webbed, and dilated; underneath they bear two rows of lamellae in a pattern resembling a paripinnate compound leaf.[4] This leads to their other and more ambiguous common name, "leaf-toed geckos", used mainly for species from South Asia and its surroundings to prevent confusion with the many "leaf-toed" Gekkota not in Hemidactylus.

Underside of a leaf-toed Gecko.

Some members of the genus, such as H. platyurus, are able to run quadrupedally across water by a partially surface tension-dependent mechanism distinct from the bipedal gait of basilisks.[5]

Communication

Like many other gecko species, species in the genus Hemidactylus are able to communicate with distinct vocalizations. Depending on the species, their vocalizations range from quiet clicks to short squeaks and chirps. For example, the Asian common house gecko (Hemidactylus frenatus) is notable for its distinctive chirping.

Species
Juvenile common house gecko (H. frenatus).
Juvenile Mediterranean house gecko (H. turcicus).
Unidentified Hemidactylus adult from Dindigul (Tamil Nadu, India).
Common lizard in Chennai, India.

Phylogeny

The following phylogeny is from Pyron, et al. (2013),[10] and includes 47 Hemidactylus species. Hemidactylus is a sister group of Cyrtodactylus.[10]

Hemidactylus 
 
 

Hemidactylus bowringii

 
 
 

Hemidactylus garnotii

 
 
 

Hemidactylus karenorum

 
 

Hemidactylus platyurus

 
 
 
 
 
 
 
 

Hemidactylus fasciatus

 
 
 
 
 

Hemidactylus aaronbaueri

 
 

Hemidactylus giganteus

 
 
 
 

Hemidactylus depressus

 
 
 

Hemidactylus triedrus

 
 
 

Hemidactylus prashadi

 
 

Hemidactylus maculatus

 
 
 
 
 
 
 
 

Hemidactylus leschenaultii

 
 

Hemidactylus flaviviridis

 
 
 
 

Hemidactylus frenatus

 
 
 

Hemidactylus brookii

 
 
 

Hemidactylus sataraensis

 
 
 

Hemidactylus imbricatus

 
 
 

Hemidactylus albofasciatus

 
 
 

Hemidactylus reticulatus

 
 

Hemidactylus gracilis

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Hemidactylus angulatus

 
 

Hemidactylus haitianus

 
 
 
 
 

Hemidactylus mabouia

 
 

Hemidactylus mercatorius

 
 
 
 
 

Hemidactylus longicephalus

 
 

Hemidactylus platycephalus

 
 
 
 
 

Hemidactylus greeffii

 
 

Hemidactylus brasilianus

 
 
 
 

Hemidactylus bouvieri

 
 
 

Hemidactylus palaichthus

 
 

Hemidactylus agrius

 
 
 
 
 
 
 
 
 
 

Hemidactylus modestus

 
 
 

Hemidactylus citernii

 
 

Hemidactylus foudaii

 
 
 
 
 
 

Hemidactylus pumilio

 
 
 

Hemidactylus dracaenacolus

 
 

Hemidactylus granti

 
 
 
 
 

Hemidactylus persicus

 
 
 
 

Hemidactylus yerburii

 
 

Hemidactylus robustus

 
 
 
 
 

Hemidactylus turcicus

 
 
 

Hemidactylus lemurinus

 
 

Hemidactylus mindiae

 
 
 
 
 

Hemidactylus macropholis

 
 
 

Hemidactylus oxyrhinus

 
 
 

Hemidactylus forbesii

 
 

Hemidactylus homoeolepis

 
 
 
 
 
 
 
 
 
 
 
 

Similar species
gollark: Agh. It's so hard to just get random hatchlings for this CB thalassa.
gollark: Quack.
gollark: To stop you from being able to freeze and get trophies twice as fast.
gollark: Free, offer between 2 and 4 NDs and 2G prizes, will wait 24 hours for best offer.
gollark: Free, CB ND or 2G prize.

References
  1. Dahms Tierleben. www.dahmstierleben.de
  2. Lizards of the World (2004): Hemidactylus. Version of 2004-FEB-08. Retrieved 2009-APR-04.
  3. "House Geckos".
  4. Boulenger, G.A. (1890). The Fauna of British India, Including Ceylon and Burma. Reptilia and Batrachia. London: Secretary of State for India in Council. (Taylor and Francis, printers). xviii + 541 pp. (Genus Hemidactylus, p. 82). Fulltext at the Internet Archive
  5. Nirody, J. A.; Jinn, J.; Libby, T.; Lee, T. J.; Jusufi, A.; Hu, D. L.; Full, R. J. (2018). "Geckos Race Across the Water's Surface Using Multiple Mechanisms". Current Biology. 28 (24): 4046–4051.e2. doi:10.1016/j.cub.2018.10.064. PMID 30528580.
  6. Angarwal I, Giri VB, Bauer AM (2011). "A new cryptic rock-dwelling Hemidactylus (Squamata: Gekkonidae) from south India". Zootaxa 2765: 21-37. (Hemidactylus graniticolus, new species).
  7. Beolens B, Watkins M, Grayson M (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Hemidactylus greeffii, p. 107; Cyrtodactylus malcolmsmithi, p. 247).
  8. "Hemidactylus greeffii ". The Reptile Database. www.reptile-database.org.
  9. Henle K, and Böhme W (2003). "A new species of Hemidactylus (Squamata: Gekkonidae) from West Africa, and comments on species hitherto confused with H. muriceus ". African Journal of Herpetology 52 (1) 23-38. (Hemidactylus pseudomuriceus, new species).
  10. Pyron, R Alexander, Frank T Burbrink and John J Wiens. 2013. A phylogeny and revised classification of Squamata, including 4161 species of lizards and snakes. BMC Evolutionary Biology 2013 13:93. DOI: 10.1186/1471-2148-13-93
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