Rhacodactylus leachianus

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Rhacodactylus leachianus
Rhacodactylus leachianus 33603748.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Diplodactylidae
Genus: Rhacodactylus
Species:
R. leachianus
Binomial name
Rhacodactylus leachianus
(Cuvier, 1829)
Rhacodactylus leachianus map.svg
Approximate distribution (New Caledonia, Oceania)
  Range
Synonyms [2]
List
  • Ascalabotes leachianusCuvier, 1829
  • Pteropleura leachianusGray, 1831
  • Lomadactylus leachianusvan der Hoeven, 1833
  • Gecko leachiiSchinz, 1834
  • Platydactylus leachianusWiegmann, 1834
  • Hoplodactylus leachianusFitzinger, 1843
  • Rhacodactylus leachianusBocage, 1873

Rhacodactylus leachianus, commonly known as the New Caledonian giant gecko, Leach's giant gecko, leachianus gecko, or Leachie, is the largest living species of gecko and a member of the family Diplodactylidae. It is native to most of New Caledonia.

Contents

Taxonomy

The specific name, leachianus, is in honor of English zoologist William Elford Leach. [3] Historically, there have been three recognized subspecies of R. leachianus (including the nominotypical subspecies): R. l. aubrianus, R. l. henkeli (first described by Seipp and Obst in 1994), [4] and R. l. leachianus. However, based on recent molecular data, no populations of R. leachianus are granted subspecies status at the present time. [1] [5] Instead, locality based morphotypes are used to distinguish populations of R. leachianus. [6]

Description

Close-up of the New Caledonian giant gecko Diplodactylidae - Rhacodactylus leachianus.JPG
Close-up of the New Caledonian giant gecko

R. leachianus is the largest extant gecko in the world [7] and is considered an example of island gigantism. R. leachianus of the Grande Terre localities are capable of growing 14–17 inches (360–430 mm) long, with a weight range between 250 and 500 grams. [6] R. leachianus of the Insular localities are capable of growing 9–12" (23–30 cm) long, and weighting between 150 and 300 grams. It has a heavy body, loose skin, and a small, stumpy tail. It is variable in color, coming in shades of mottled green, gray, and brown, sometimes with highlights of white, orange, and/or pink. [1] It was only exceed in size by the now extinct Gigarcanum delcourti known from a single specimen 50% longer and probably several times heavier than the largest R. leachianus specimens, which also originated from New Caledonia. [8]

Distribution and habitat

R. leachianus is found in all of the southern and eastern portions of the main island of New Caledonia, as well as on several of the smaller islands in the group. Topographical and ecological differences observed at each locality may have contributed to the phenotypical and morphological differences seen in R. leachianus. The insular locality of Duu Ana is thought to no longer have an extant population of R. Leachianus. [6]

Localities of R. leachianus

R. Leachianus often show locality-specific phenotypical coloration, size, and morphological differences called morphotypes. The largest locality group of R. leachianus are those found on the main island of New Caledonia, Grande Terre. The localities associated with Grande Terre, often referred to as the "mainland localities", include the Yate locale, the Mount Khogis locale, the Goro locale, the Poindimie locale, and the Mount Humboldt locale. Early on, a typing system was created in attempt to group phenotypical traits seen on Grande Terre together. This typing system included Type A, Type B, and Type CR. leachianus. However, this typing system is no longer considered an accurate means of locale identification, but is still commonly used for generalization within the pet trade. Type AR. leachianus were those that had little to no patterning on the laterals, containing a dark, solid or webbed background coloration. Type BR. leachianus were those that displayed lateral patterning in the form of linear blotches, or solid-colored vertical bars, commonly paired with a dark base coloration. Type B R. leachianus were said to be the most patterned of the various types. Type CR. leachianus were those that are slow growing, large geckos, commonly paired with light blotching and a dark base color. Type C R. leachianus are reported to grow up to 17 inches in length. [6] [9]

R. leachianus are also found on the neighboring islands of Grant Terre, commonly referred to as the "insular localities". These Insular localities include the Isle of Pines locale, the Nuu Ami locale, the Nuu Ana locale, the Duu Ana locale, the Moro locale, the Bayonnaise locale, the Brosse locale, and the Caanawa locale. [6] [9]

Yate (mainland)

R. leachianus displaying the "dark netting" pattern. Rhacodactylus leachianus 33600146.jpg
R. leachianus displaying the "dark netting" pattern.

R. leachianus found in the Yate region are recognized as one of the largest localities, being heavy bodied, bulky animals. They often have elongated tails in comparison to most other locales. Yate R. leachianus can reach above 400 grams, and grow up to 15 inches in length. they are found to have a base coloration that can range from a dark brown to golden yellow. Dark netting or thin webbing is also commonly found accompanying the base coloration. Thin, white lines may also be present on the laterals. [9]

Mount Khogis (mainland)

R. leachianus found in the Mount Khogis region are also among the largest of the locales, commonly reaching over 300 grams. Mount Khogis R. leachianus display base colorations that range from jet black to olive green. These individuals may possess enlarged scales that run the length of the snout ridges, which can be used as a differentiating factor for this locale. White blotches may also be present on the laterals, varying widely in size. [9]

Goro (mainland)

R. leachianus found in the Goro locality are a large locale, reaching up to 17 inches in length and 500 grams. Goro R. leachianus are dark in coloration, with accompanying white blotches that run vertically in rows along the lateral sides. White specking may also be present along the entire body of the individual. [9]

Poindimie (mainland)

R. leachianus found in the Poindimie region are often longer and leaner than other mainland localities. Poindimie R. leachianus are one of the largest localities, reaching over 400 grams. Base coloration is often variable, including greens, blacks, yellows, and browns. Little to no patterning is seen in the Poindimie locale, however, yellow or white spotting may occur with age. [9]

Mount Humboldt (mainland)

R. leachianus displaying the "white blotching" on the laterals, with additional "black peppering". Rhacodactylus leachianus 33603671.jpg
R. leachianus displaying the "white blotching" on the laterals, with additional "black peppering".

R. leachianus found in the Mount Humboldt region are large bodied, bulky individuals. Base coloration is often described as variable, ranging from blacks to browns and greens. White blotches may be present, commonly covering the laterals and occasionally on the dorsal. Mount Humboldt R. Leachianus may reach up to 420 grams in weight. [9]

Brosse (Insular)

R. leachianus found on the island Brosse are often referred to as one of the larger insular forms with a robust shape. The coloration is often yellow or green, with large pink or white blotching, accompanied by black flecking. this locality may be referred to as the "striped neck" locale, due to bars that begin just after the head and continue down the neck area. Brosse Locality R. leachianus can weigh roughly 250g, and measure up to 10 inches in length. The island of Brosse is also referred to as "Isle D". [9]

Bayonnaise (Insular)

R. leachianus found on the island Bayonnaise are characterized by a yellow-green base color, often displaying banding that covers the laterals and dorsal. This banding can range from thinner blotched white band to larger pink, purple, or white bands. The Island of Bayonnaise is also known as "Isle C". [9]

Nuu Ana (Insular)

R. leachianus found on the island of Nuu Ana is the smallest recorded locality of R. leachianus. Nuu Ana individuals often have shorter limbs with an overall robust appearance. The Nuu Ana locale may reach up to 9 inches in length, and remain under 200 grams. The base color can range from various shades of greenish yellow, often with large colorful blotching or barring along the entire body of the gecko. The island of Nuu Ana is also known as "Isle G". [9]

Nuu Ami (Insular)

R. leachianus displaying the W-shaped pattern on the dorsal. Rhacodactylus leachianus 33611667.jpg
R. leachianus displaying the W-shaped pattern on the dorsal.

R. leachianus found on the island of Nuu Ami are a small locale, reaching up to 200 grams. Nuu Ami R. leachianus often display a darker gray iris in comparison to other localities. Base coloration may range from deep greens to bright yellows, commonly accompanied by white or pink blotching. Nuu Ami locality R. leachianus may also have spots or blotching arranged in a "W" shape along the dorsal area. The island of Nuu Ami is also known as "Isle H". [9]

Duu Ana (Insular)

R. leachianus found on the island of Duu Ana are characterized by their dark green-brown base coloration, along with light colored barring that lines the laterals of the gecko. Barring may also be present along the dorsal. Duu Ana R. leachianus often display morphological traits, such as larger legs in comparison to other insular localities. It is speculated that this locality may eat crabs, due to low availability of fruit matter on the island. The Duu Ana locale is thought to be extinct in the wild, though, evidence is needed. Smaller breeding populations remain in captivity. The island of Duu Ana is also known as "Isle I". [9]

Caanawa (Insular)

R. leachianus found on the island of Caanawa are a larger insular locality. The base coloration is often variable, ranging from browns to light green. The patterning on Caanawa R. leachianus often display deep purple blotching or barring, with a significant amount of black peppering. The island of Caanawa is also known as "Isle K". [9]

Isle of Pines (Insular)

R. leachianus found on the Isle of Pines are the largest of the Insular localities, reaching up to 12 inches in length and surpassing 300 grams. The Isle of Pines locality is often characterized by large head and neck regions, with a robust appearance. Base coloration is often deep green, but also can range from brown to yellow. This is accompanied by white blotches present on the laterals and dorsal area of the gecko. The Isle of Pines can also be referred to as "Pine Island". [9]

Moro (Insular)

R. leachianus found on the Island of Moro is one of the largest insular localities, reaching up to 12 to 13 inches in length. The Moro locality often displays a green base color, with large pink or white blotching. The head shape for the Moro locality is large with a snout that is squared off. The island of Moro is also known as "Isle E". [9]

Biology

The ventral side of an R. Leachianus foot pad displaying Lamellae. New Caledonian Giant Gecko or Leach's Giant Gecko (Rhacodactylus leachianus).jpg
The ventral side of an R. Leachianus foot pad displaying Lamellae.

R. leachianus is an arboreal species; it is primarily nocturnal and remains hidden in tree hollows during the day. [6] it has a diet that includes insects, spiders, small vertebrates, fruit, nectar, and sap. The most common component of R. leachianus diet consists of the fruit from Cassine curtipendula, a small fruit with a large seed that is often seen in fecal matter. It is speculated that the elongated snouts of mainland locality R. leachianus suggest a diet model that contains more vertebrate and insect matter than their insular locality counter-parts. Records of cannibalism among R. leachianus have been recorded, but this phenomenon could be attributed to territorial defense. [6] These giant geckos can climb vertically up glass surfaces. This is due to adhesive pads on their feet called lamellae, which are made up of tiny hairs which increase friction force when applied to surfaces. [10] R. Leachianus also possess large claws that aid in climbing as well. R. leachianus are capable of dropping their tail, a self-amputation process known as autotomy. [6] Unlike Correlophus cilliatus, R. leachianus are capable of tail regeneration through a process known as epimorphosis. Males and females of R. leachianus display differentiating morphological characteristics known as sexual dimorphism. Male R. leachianus display a hemipenal bulge at the base of the tail, whereas females do not have this bulge. R. leachianus is observed to have temperature dependent sex determination. In captivity, eggs with a sustained incubated at 85 °F will often result in male offspring, and eggs that have a sustained incubation temperature of 72 °F (22 °C) will result in female offspring. [6]

Mating behavior and reproduction

Popular lore within the enthusiast lay community has promoted the notion that R. leachianus may pair monogamously in the wild and may remain compatible and establish a pair-bond, which may last for a single breeding season or persist for several years. In captivity, some hobbyists have responded to this notion of pair-bonding by keeping successful pairs together until the animals display incompatibility (fighting, injury, abject sequester by conspecific), at which time the bond-broken animals are separated permanently or reintroduced to one another at a later date (or introduced to different animals) in an attempt to establish a new pair-bond. It remains unclear whether the pair-bond is a real phenomenon for R. leachianus or whether it is simply a perception created within the hobby itself. That is, perhaps the mere act of participation in folklore methods simply establishes a scenario that promotes the inevitable reinforcement of the folklore. Breeding behavior involves biting and thrashing that can become violent, often accompanied with locking jaws. The popular notion is that these behaviors may serve to test for pair compatibility and physical capability of a mate. However, it remains unclear whether the level of savagery witnessed in captivity is present in the wild populations. The necessary limits of an otherwise healthy captive environment may disallow some natural thresholds required for the resolution of conflict between conspecifics (for example, the natural required distance of separation may exceed the space limits in a captive setting). In the wild, a male-female pair of R. leachianus will commonly reside in an otherwise unoccupied tree hollow, which the pair will defend by displaying territorial behavior, such as vocalization. Tree hollow related behavior is similar to that of hollow nesting birds. Mate identification is thought to be done through a process called scent marking. [6] Adult females of R. leachianus usually lay two eggs at a time (universal trait for all geckos), having up to 10 clutches per year. [6] [11] Older females in captivity may not lay clutches in a breeding season, even when paired with a compatible male. However, older females can lay clutches over the course of their entire adult lifespan. Pair incompatibility in a previously compatible pair may occur, often indicated by aggressive territorial behavior and injury. There have been claims of parthenogenesis in unpaired females in captivity, but these have not been confirmed. [6]

Vocalization

R. leachianus have the widest range of vocalizations of any member of the gekkonidae family. [6] R. leachianus can make a loud growling noise, and local people call it "the devil in the trees". [11] This growling vocalization is speculated to be a warning call is often made in the presence of a predator or a rivaling R. leachianus. Clucking is another common vocalization, commonly associated with mate calling, often heard at night. A light whistle sound is used to display discomfort, or mild stress. Bird-like chirping is seen in the larger mainland localities, which incorporates a heightened stance and a gaping mouth for a threat display, often followed by a lunging motion. [6]

Coloration and camouflage

Many lizards exhibit an ability to alter the hue and/or intensity of skin color (chameleons are the extreme example), and New Caledonian Geckos are no exception. This phenomenon is facilitated by pigment-containing cells called chromatophores. This is a form of camouflage and can help the gecko blend into their environments.[ citation needed ] Various factors may contribute to this change in skin color, including the endocrine system or environmental factors such as variations in sunlight and temperature. [10]

Folklore

Some of the indigenous Kanak people of New Caledonia fear Leach's giant gecko. This is because of an old superstition which purports that it has the ability to cling to a person's body and pull out that person's soul. [12]

Conservation status

Populations of the species R. leachianus have likely been reduced by habitat destruction and degradation. This process is still a threat to the species. It also faces predation by introduced species such as cats and various rodents. It is also poached. It can be electrocuted when it travels along power lines. This species is protected and it lives in several nature reserves. [1]

In captivity

The New Caledonian giant gecko is occasionally kept as a pet. Individuals in the pet trade are propagated with captive breeding; wild populations are protected. This species may live over 20 years in captivity, [13] with some individuals reaching up to 50 years old. Selective breeding for the pet trade has continued to maintain pure locality R. leachianus in captivity, with the addition of locality cross-breeding to create desirable phenotypes, such as dramatic coloration, size, and structure. [13] [6] [9]

Related Research Articles

<span class="mw-page-title-main">Geography of New Caledonia</span>

The geography of New Caledonia (Nouvelle-Calédonie), an overseas collectivity of France located in the subregion of Melanesia, makes the continental island group unique in the southwest Pacific. Among other things, the island chain has played a role in preserving unique biological lineages from the Mesozoic. It served as a waystation in the expansion of the predecessors of the Polynesians, the Lapita culture. Under the Free French it was a vital naval base for Allied Forces during the War in the Pacific.

<i>Eurydactylodes</i> Genus of lizards

Eurydactylodes is a small genus of geckos commonly referred to as chameleon geckos from the subfamily Diplodactylidae, endemic to New Caledonia and few adjacent islands. Within the Diplodactylidae, Eurydactylodes resides in the Carphodactylini tribe, and consists of four species. All species share similar morphology as well as lifestyle and habits. The first of the Eurydactylodes species to be classified, E. vieillardi, was discovered in 1869.

<span class="mw-page-title-main">Gargoyle gecko</span> Species of lizard

The gargoyle gecko, knob-headed giant gecko, New Caledonia bumpy gecko, or New Caledonian bumpy gecko is a species of gecko found only on the southern end of the island of New Caledonia. Its habitat is threatened by deforestation on the island. This species of gecko is the smallest of the six recognized species in its genus where they often reach about 125 mm in size. This gecko, along with several other Rhacodactylus species are being considered for protective measures by CITES, which would put restrictions on their exportation. This gecko was first described by Bavay in 1869.

<span class="mw-page-title-main">Crested gecko</span> Species of lizard

The crested gecko or eyelash gecko is a species of gecko native to southern New Caledonia (France). In 1866, the crested gecko was described by French zoologist Alphonse Guichenot. This species was thought to be extinct until it was rediscovered in 1994 during an expedition led by Robert Seipp. Along with several other New Caledonian gecko species, it is being considered for protected status by the Convention on the International Trade in Endangered Species of Wild Flora and Fauna.

<i>Mniarogekko chahoua</i> Species of lizard

Mniarogekko chahoua, commonly known as the mossy New Caledonian gecko, short-snouted New Caledonian gecko, Bavay's giant gecko, or mossy prehensile-tailed gecko, is an arboreal gecko found natively on the southern portion of the island of New Caledonia and on the outlying islands of Île des Pins.

<i>Correlophus sarasinorum</i> Species of lizard

Correlophus sarasinorum, also called commonly Roux's giant gecko, Sarasins' giant gecko, Sarasin's [sic] giant gecko (incorrectly), and the suras gecko, is a species of lizard in the family Diplodactylidae. The species is native to the southern portions of the outlying New Caledonian island of Grande Terre.

The rough-snouted giant gecko, also known as the greater rough-snouted gecko or tough-snouted gecko, is a species of gecko found in New Caledonia.

<span class="mw-page-title-main">Leopard gecko</span> Species of reptile

The leopard gecko or common leopard gecko is a ground-dwelling gecko native to the rocky dry grassland and desert regions of Afghanistan, Iran, Pakistan, India, and Nepal. The leopard gecko has become a popular pet, and due to extensive captive breeding it is sometimes referred to as the first domesticated species of lizard.

<span class="mw-page-title-main">Biodiversity of New Caledonia</span> Variety of life in the New Caledonia archipelago and its seas

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<span class="mw-page-title-main">Isle of Pines (New Caledonia)</span> Pacific island of New Caledonia

The Isle of Pines is an island in the Pacific Ocean, in the archipelago of New Caledonia, an overseas collectivity of France. The island is part of the commune (municipality) of L'Île-des-Pins, in the South Province of New Caledonia. The Isle of Pines is nicknamed l'île la plus proche du paradis.

<span class="mw-page-title-main">Tokay gecko</span> Species of reptile

The tokay gecko is a nocturnal arboreal gecko in the genus Gekko, the true geckos. It is native to Asia and some Pacific Islands.

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<span class="mw-page-title-main">Island gigantism</span> Evolutionary phenomena leading to an increase of the size of species with insularity

Island gigantism, or insular gigantism, is a biological phenomenon in which the size of an animal species isolated on an island increases dramatically in comparison to its mainland relatives. Island gigantism is one aspect of the more general "island effect" or "Foster's rule", which posits that when mainland animals colonize islands, small species tend to evolve larger bodies, and large species tend to evolve smaller bodies. This is itself one aspect of the more general phenomenon of island syndrome which describes the differences in morphology, ecology, physiology and behaviour of insular species compared to their continental counterparts. Following the arrival of humans and associated introduced predators, many giant as well as other island endemics have become extinct. A similar size increase, as well as increased woodiness, has been observed in some insular plants such as the Mapou tree in Mauritius which is also known as the "Mauritian baobab" although it is member of the grape family (Vitaceae).

<i>Gigarcanum</i> Extinct species of lizard

Gigarcanum delcourti, formerly Hoplodactylus delcourti, is an extinct species of gecko in the family Diplodactylidae. It is the largest known of all geckos, with a snout-to-vent length (SVL) of 37 cm (14.6 in) and an overall length of at least 60 cm (23.6 in). It is only known from a single taxidermied specimen collected in the 19th century that was rediscovered unlabelled in a museum in France. The origin of the specimen was undocumented. While originally suggested to have been from New Zealand and the kawekaweau of Māori oral tradition, DNA evidence from the specimen suggests that it originates from New Caledonia.

<i>Sorubim</i> Genus of fishes

Sorubim is a small genus of long-whiskered catfish native to tropical South America. A number of characteristics allows the differentiation of each species in the genus. Sorubim species are important food fish in South America and are highly significant to fisheries of some areas; however, harvests of these fish are not identified as much as other, more popular food fishes such as Colossoma, Arapaima, and Brachyplatystoma. Some species of this family are popular aquarium fish.

The whitefin swellshark is a species of catshark, belonging to the family Scyliorhinidae, endemic to southeastern Australia. It is found 126–554 m (413–1,818 ft) down, on the outer continental shelf and upper continental slope. Reaching 1.1 m (3.6 ft) in length, this shark has a very thick body and a short, broad, flattened head with a large mouth. It is characterized by a dorsal color pattern of dark saddles and blotches over a brown to gray background, and light fin margins. When threatened the whitefin swellshark can inflate itself with water or air to increase its size. Reproduction is oviparous. As of 2019 The International Union for Conservation of Nature (IUCN) has assessed this species as Critically Endangered due to the significant decline of the population.

<span class="mw-page-title-main">Terror skink</span> Species of lizard

The terror skink, also called commonly Bocourt's terrific skink, Bocourt's eyelid skink and Bocourt's skink, is a species of lizard in the family Scincidae. The species is endemic to the Île des Pins, a small islet off the coast of New Caledonia. First described in 1876, the species was presumed to be extinct, but was rediscovered in 1993, and since then several individuals have been seen. Because of its small area of occupation and small population size, the International Union for Conservation of Nature has assessed its conservation status as being "critically endangered".

The flagtail swellshark is a little-known species of catshark, belonging to the family Scyliorhinidae, found at a depth of 480–700 m (1,570–2,300 ft) off northeastern Queensland, and possibly also nearby islands. This stout-bodied shark has a short, broad, and flattened head with a capacious mouth. Adults have a variegated brown coloration with 9–10 darker dorsal saddles and V-shaped blotch at the tip of the upper caudal fin lobe. Juveniles are yellow with narrow brown bars instead of saddles, and a distinctive marking between the spiracles shaped like two loops connected by a line. Like other swellsharks, this species can inflate its body when threatened.

<span class="mw-page-title-main">Diplodactylidae</span> Family of lizards

The Diplodactylidae are a family in the suborder Gekkota (geckos), with over 150 species in 25 genera. These geckos occur in Australia, New Zealand, and New Caledonia. Diplodactylids are the most ecologically diverse and widespread family of geckos in both Australia and New Caledonia, and are the only family of geckos found in New Zealand. Three diplodactylid genera have recently been split into multiple new genera.

<i>Rhacodactylus trachycephalus</i> Species of lizard

Rhacodactylus trachycephalus, commonly known as the lesser rough-snouted giant gecko, dwarf rough-snouted giant gecko, or tough-snouted giant gecko, is a species of gecko endemic to two small areas of islands in New Caledonia. Its body grows to around 10 centimetres (3.9 in) and has a mosaic pattern with a variety of colors. Rhacodactylus trachyrhynchus is a closely related species, but R. trachycephalus is smaller and has a number of other noticeable differences. R. trachycephalus is viviparous, giving birth to only one or two young a year. Its restricted humid forest habitat is vulnerable due to multiple threats. As a result of habitat reduction, low reproduction rate and small population, it is one of the rarest geckos in the world.

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  10. 1 2 Rhacodactylus leachianus. Australian Reptile Park.
  11. https://www.youtube.com/watch?v=0FJNE4V7aPI LEACHIANUS GECKOS IN THE WILD, PART 1! | Rhacodactylus leachianus | (New Caledonia, 2018)
  12. 1 2 Guide to the Largest Geckos in the World. Stephen Cemelli.