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Argentine black and white tegu

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Argentine black and white tegu
Male
Female
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Teiidae
Genus: Salvator
Species:
S. merianae
Binomial name
Salvator merianae
Synonyms[3]
  • Salvator merianae
    A.M.C. Duméril & Bibron, 1839
  • Teius teguixim
    — Gray, 1845
  • Tupinambis teguixin
    — Boulenger, 1885
  • Tupinambis merianae
    — Dirksen & De la Riva, 1999
  • Salvator merianae
    — Harvey et al., 2012

The Argentine black and white tegu (Salvator merianae), can also be called the Argentine giant tegu, the black and white tegu, the huge tegu, and the lagarto overo in Spanish[1]. The Salvator merianae is a species of lizard in the family Teiidae. The species is the largest of the "tegu lizards".[4] It is an omnivorous species which inhabits the tropical rain forests, savannas and semi-deserts of eastern and central South America.

Tegus are sometimes kept as pets. They are notable for their unusually high intelligence and can also be housebroken. Like other reptiles, tegus go into brumation in autumn when the temperature drops. They exhibit a high level of activity during their wakeful period of the year.

Tegus fill ecological niches similar to those of monitor lizards, but are only distantly related to them; the similarities are an example of convergent evolution.

Etymology

The specific name, merianae, is in honor of German-born naturalist Maria Sibylla Merian.[5]

Description

An Argentine black and white tegu seen in Florianópolis, Santa Catarina, Brazil

As a hatchling, Salvator merianae has an emerald green color from the tip of its snout to midway down its neck, with black markings. The emerald green becomes black several months after shedding. As a young tegu, the tail is banded yellow and black; as it ages, the solid yellow bands nearest to the body change to areas of weak speckling. Fewer solid bands indicates an older animal. A tegu can drop a section of its tail as a distraction if attacked. The tail is also used as a weapon to swipe at an aggressor; even a half-hearted swipe can leave a bruise.

Tegus are capable of running at high speeds and can run bipedally for short distances. They often use this method in territorial defense, with the mouth open and front legs held wide to look more threatening.

Adult males are much larger than the females and can reach 3 feet (91 cm) in length at maturity. They may continue to grow to lengths of 4–4.5 feet (120–140 cm).

The females are much smaller, but may grow up to 3 feet (91 cm) in length from nose to tail. They have beaded skin and stripes running down their bodies. Adult females can reach a weight of 2.5–7.0 kilograms (5.5–15.4 lb).[6]

The skull is heavily built with a large facial process of the maxilla, a single premaxilla, paired nasals, a single frontal bone and a single parietal bone. Biomechanical analyses suggest the posterior processes of the parietal might be important for dealing with torsional loads due to posterior biting on one side.[7] In the large adults, the posterior teeth are larger and more rounded than the anterior teeth.[8]

Sex

When a tegu reaches the age of 8 months, the beginning of their juvenile age, their sex can easily be determined visually; their vent at the base of the tail will bulge when it is a male and lie flat when it is a female. Breeders generally inform the buyer on the sex of the animal before the purchase. In adults, the main difference is in the jowls; adult males have substantially developed jowls (a result of hypertrophic lateral pterygoideus muscles[9]), while females' jawlines are more streamlined.

Blue tegu

An immature blue tegu resting

The blue tegu is a variant known for its light blue coloration, which is most intense and vivid in the adult males. Even immature animals can be easily distinguished from other mostly black and white tegus by the "singe mark" on their nose. They are among the more suitable tegus for pets and can be easily tamed but, in the wild, will either try to run away or react aggressively if provoked. There is much controversy about the correct scientific classification of this animal. Large-scale taxon sampling of the teiids has not led to any strong resolutions based on morphological and genetic data;[10] the majority of data about the blue tegu comes from hobbyists. Some believe it is a mutation of the Argentine black and white tegu, while others, including the original importer,[11] believe it is sufficiently different to have its own classification. The first blue tegu to be exported from South America was in a wholesale shipment of tegus from Colombia.[11]

The coloring of a blue tegu can range from a simple black and white color to albino to powder blue to even "platinum", which is basically a high white color morph. The colouration does not tend to appear until the animal reaches sexual maturity around the age of 18 months or it reaches 2 feet (61 cm) or more in size. Just like the Argentine black and white tegu, the blue tegu has a very quick growth rate, almost reaching 75% of its full length in 1 year. Their adult length can vary from 2.5 feet (76 cm) in adult females to sometimes even longer than 4 feet (122 cm) in adult males. Unlike other lizards, these are very heavily built animals, ranging from 7 to 12 pounds (3.2 to 5.4 kg) or more when fully grown. Size is relative to genetics as well as husbandry and diet.

Epidemiology

Almost all S. merianae at a captive breeding field station at the State University of Santa Cruz, Ilhéus, Bahia state, Brazil have salmonella,[12] suggesting that it is common throughout Brazil.[12]

Habitat and Distribution

Salvator merianae (once known as Tupinambis merianae) aka the Argentine Black and White Tegu is a large reptile native to South America. There are significant populations of Argentine Black and White Tegus in the southern United States and the Brazilian coast. They are a consistently problematic invasive species in Florida counties, most likely as a result of escaped or released species from the early 2000s pet trade. Previous studies have found that the differing weather and climate patterns far outside of this invasive habitat range do not prevent adult Argentine Black and White Tegus from surviving in diverse areas across the United States, furthering concerns about their invasive status. In the wild, tegus habitat both forested and open plain environments, widening their potential invasive range.[13]

Tegus have also been found in scrub and wet habitats such as flooded savannas, canals, ponds, and streams. They largely seem indiscriminate of habitat type as long as they have the ability to burrow.[14]

Diet

Tegus are omnivorous. Juvenile tegus in the wild have been observed to eat a wide range of invertebrates including insects, annelids, crustaceans,[15] spiders and snails.[16] They also eat fruits and seeds. As they grow, they become more predatory and the protein content of their diet rises. They may seek out eggs from other reptiles' and from birds' nests and will eat small birds and other vertebrates such as fish, anurans, other lizards, snakes and small mammals (such as rodents[17]).[15] In adulthood, tegus continue to eat insects and wild fruits and it is assumed that such components include desirable or essential nutrients.

In captivity, tegus commonly are fed high protein diets that include raw or cooked flesh such as ground turkey, canned and dry dog food, commercial crocodile diet, chicken, eggs, insects and small rodents. The inclusion of fruit in the diet is recommended. Though some captive tegus do not readily eat fruit, others enjoy bananas, grapes, mangoes and papayas.[15] However, there is evidence that, as in most husbandry of carnivores, it is good practice to cook most of the egg in the diet, so as to denature the protein avidin that occurs in the albumen. Raw avidin immobilises biotin, so excessive feeding of raw eggs may cause fatal biotin deficiency.[18]

As adults, they have blunted teeth and exaggerated lateral pterygoidal muscles which allow them to be generalist feeders. In captivity, they have been observed eating various feeder insects like mealworms, superworms, earthworms, silkworms, crickets and cockroaches, as well as vertebrate prey like mice, rats, fish, turkey (offered in a ground form), rabbit, quail and chicks. Crustaceans such as crayfish are also readily consumed. Like all lizards, blue tegus need a properly balanced diet; incomplete prey items such as insects or ground meat require dusting with a mineral/multi-vitamin supplement. Vitamin deficiencies can lead to trouble shedding skin, lethargy and weight loss; a calcium deficiency can lead to metabolic bone disease, which can be fatal.[19]

Tegus are notorious egg predators which makes them a concerning rising predator of sea turtles, alligators, and crocodiles as their invasive populations spread across the United States.[14]

Tegus will eat anything from plants to hatchlings, but their diet varies by season. Small vertebrate prey is more common in the spring while plantlife and invertebrates are more commonly consumed in the summer.[20]

Life Cycle

Argentine black and white tegu lizards are typically born at the beginning of spring. When they hatch they are about ten grams and grow up to eight kilograms within four or five years, experiencing a nearly eight-hundred-fold increase in body size. During this time their diet changes from insects to small vertebrates, eggs, carrion, and fruits. They are reproductively mature by their third year (when they are around 1.5 kilograms), and cease their growth by around their fourth year with the highest growth rate being their first and second years of life. Tegu lizards also experience a seasonal circadian life cycle that begins within their first year, being very active during hotter months and in a hibernative state in the colder months. However, regardless of the season the Argentine tegu does not experience any significant fluctuations in metabolism or body mass, which means their sensitivity to temperature underlying their metabolic rate does not change body mass. This differs from other endotherms and further explains the tegu’s alternating endothermic and ectothermic behavior.[21]

Brain vesicles (constructed from two neural tube constrictions) that make up the anterior forebrain, midbrain, and posterior hindbrain are developed and distinguishable from day three of embryonic development. On day four, visceral arches (consisting of mesenchymal tissue condensation and separated by grooves) form and are fully grown and fused by day nine. Day four also marks the development of limbs as small swellings. Its hindlimb development (developing claws faster than the forelimb) is more similar to crocodile or turtle embryonic development than other lizards. This alludes to the hindlimbs having greater functionality in tegu adults. Pigmentation is the last morphological structure to form and occurs late in development after other distinguishing characteristics have already been formed (such as scales). Pigmentation is observed from day thirty-nine first on the dorsal portion of the head and body. It later extends down to the proximal and distal portions of the limbs by day forty-five and extends down to the flanks by day forty-eight. As development advances, the pattern begins to show lateral stretch marks by day fifty-one. Pigmentation of the ventral portion of the body occurs between days fifty-seven and sixty, characterized by individualized spot patterns. Paired genital tubercles manifest in both sexes (called hemipenes in males). Reptile embryo development involves separate processes of differentiation and embryo growth. Differentiation is determined by external morphological features and is documented early. As the embryo approaches hatching, development stages are categorized into periods rather than ages (characterized by parameters of development speed).[22]

Mating

Squamate reptiles like snakes and lizards tend to rely on chemical cues to search for potential mates in their environments.The Argentine black and white tegu exhibits similar behavior, such as a marked “pausing and turning” as they trail in the spring. Female tegus in particular exhibit stronger trailing behavior than males, following scent trails more intensely and expressing a more sensitive response to mating-specific chemical odors. They also exhibit more decisive behavior, demonstrating a common vertebrate trend of female reproduction being the defining factor in influencing population size. Knowledge of this behavior is currently being explored as a strategic avenue to inhibit the current rise of the tegu as an invasive species. Females being removed from the environment first can potentially curb invasive populations further. Tegus are a burrowing species in both their native and invasive habitats, especially during the winter. They mate during the spring after hibernating when their mating hormones are at their peak. During the spring, male Argentine tegus exhibit scent-marking behaviors such as delineating territory with gland scents.[23]

Blue tegus, like other tegus, may breed up to twice a year. They only lay between 18 and 25 eggs in a clutch, sometimes more dependent upon animal size and husbandry as well as the individual health of the gravid female.

Squamate reptiles like snakes and lizards tend to rely on chemical cues to search for potential mates in their environments. The Argentine black and white tegu exhibits similar behavior, such as a marked “pausing and turning” as they trail in the spring. Female tegus in particular exhibit stronger trailing behavior than males, following scent trails more intensely and expressing a more sensitive response to mating-specific chemical odors. They also exhibit more decisive behavior, demonstrating a common vertebrate trend of female reproduction being the defining factor in influencing population size. Knowledge of this behavior is currently being explored as a strategic avenue to inhibit the current rise of the tegu as an invasive species. Females being removed from the environment first can potentially curb invasive populations further. Tegus are a burrowing species in both their native and invasive habitats, especially during the winter. They mate during the spring after hibernating when their mating hormones are at their peak. During the spring, male Argentine tegus exhibit scent-marking behaviors such as delineating territory with gland scents.[23]

Parental Care

During maternal seasons, female Argentine black and white tegus build nests out of dry grass, small branches, and leaves in order to maintain optimal temperature and humidity levels. Egg incubation lasts for an average of sixty-four days and can range between forty to seventy-five days depending on incubation temperature and other extenuating factors.[24]

Social Behavior

Aggression

Aggression is a vital facet to animal behavior as it provides advantages to survival when resources are limited. For the Argentine tegu, the physical performance of their aggressive behavior (i.e. biting) tends to be hindered by their large size. Regardless of sex, tegus with higher bite force are more aggressive to potential threats. Those with a higher bite force also exhibit less escape responses and tend to be slower, displaying a trade off of fight or flight abilities, but also have the advantage of minimizing risk of energy by reducing the threshold for engagement in an aggressive encounter. This fight or flight trade off is more commonly observed in mammals rather than reptiles, and may be present in tegus because of an increase in head mass (correlated to stronger biting behavior) that makes it difficult to maneuver quickly. In their home territory, Argentine tegus are generally less aggressive (less likely to display arching behavior) and are less likely to attempt escape regardless of size or bite force.[25]

Enemies

Predators of tegus include cougars, jaguars, otters, snakes and birds of prey.

A known predator of the Argentine black and white tegu is the lesser grison (Galictis cuja).[26]

Physiology

Invasive Advantage

Physiologically, tegus possess traits that correlate to their extreme success as an invasive species. Notably, they mature early, reproduce annually, have large clutch sizes, and a relatively long life span compared to other competing species. Out of the Teiidae family, tegus tend to grow to the largest body sizes (around five kilograms). Tegus are also omnivorous and consume everything from fruits, invertebrates, small vertebrates, eggs, and carrion. Their large dietary breadth also contributes to their high survival rate outside of their native habitat. Tegus are active on a seasonal schedule. They avoid dangerously cold or dry climates by hibernating underground. Additionally, they are capable of utilizing endothermy to elevate their body temperatures in response to their environment. Thus, it is unlikely that any habitat however different from their native environment would be unsuitable for a thriving tegu population.[13]

Endothermic Behavior

Tegus in their native environment spend most of the colder months hibernating in their burrows without feeding but emerge in the spring for their mating season. While hibernating, their metabolism generates heat that maintains their temperature a few degrees above the burrow temperature, marking them as partial endotherms. This self-reliant endothermic behavior continues into the reproductive season. However, Argentine tegus only display this behavior for part of the year and behave as ectotherms for the rest (sunbathing, temperature reliant on environment). This endothermic behavior is also not a sex-biased evolutionary adaptation for egg production as both males and females indiscriminately exhibit this behavior.[27]

The Argentine tegu experiences significant shifts in metabolism and body temperature by season. They are highly active throughout the day during warmer months (such as participating in reproductive endothermy during the spring) and experience drastic metabolic suppression during the winter.[28]

Salvator merianae has recently been shown to be one of the few partially warm-blooded lizards, having a temperature up to 10 °C (18 °F) higher than the ambient temperature at nighttime;[29] however, unlike true endotherms such as mammals and birds, these lizards only display temperature control during their reproductive season (September to December), so are said to possess seasonal reproductive endothermy. Because convergent evolution is one of the strongest lines of evidence for the adaptive significance of a trait, the discovery of reproductive endothermy in this lizard not only complements the long known reproductive endothermy observed in some species of pythons,[30]but also supports the hypothesis that the initial selective benefit for endothermy in birds and mammals was reproductive.[31][32]

Locomotion

The Argentine black and white tegu is used to study the evolutionary history of shoulder joint locomotive muscles. Because of its weight and heavy girth, it has unique modifications to its skeletal gait that help map the evolutionary history of the non-mammalian musculoskeletal structure.[33]

Interactions with Humans and Livestock

As household pets

Tegus make amenable pets, as they tend to become acclimated to their owners and are generally quite docile as adults. They are intelligent and can even be housebroken. A healthy tegu can live for 15 to 20 years in the wild and possibly even longer in captivity. However, as with most reptiles, if they are not handled regularly, they show more aggressive behaviour; their bite can be painful and damaging due to strong jaws ([incorrect number displayed here, needs citation] bite force, stronger than a dwarf caiman, partly due to the short, deep skull) and sharp incisor teeth in the upper jaw. Tegus do not produce venom. Tegus will perform a threat display if they are upset or stressed. The first stage is huffing, or very heavy breathing, which means "be careful".[citation needed] Further interference causes the animal to start lashing its tail, somewhat like a moving snake. In wild animals, a third stage[citation needed] of stamping the front feet or "dancing" is seen. If all of these hints are ignored, then the tegu can charge and may bite, which might require hospital or veterinary attention.[citation needed]

As food

S. merianae - like a lot of animals used for bushmeat[34][35] - is a common food source for humans in its native range[34][35] and could be an economically and dietarily beneficial meat source if used more widely.[34][35]

Captive husbandry

To accommodate their size, a lone adult should be housed in nothing smaller than a 6 feet (183 cm) × 3 feet (91 cm) × 2 feet (61 cm) size cage, with the largest floor size possible. A pair of adults need double that size. They must have a lot of floor space. About six inches of substrate should be used to allow for burrowing, as well as a substrate that holds humidity well. Most owners use cypress mulch mixed with coconut fiber, as it retains humidity extremely well and is commercially available. Use only organic substrates, as anything with pesticides or additives, much like what you would commonly find at a hardware store, will cause many health issues with your tegu, including death. A good UVA and UVB bulb is imperative to keeping a tegu in good health. They need UVB to produce Vitamin D in their bodies, as well as metabolizing calcium. If they are not allowed exposure to UVB on a daily basis, they can experience severe pain and/or deformities from diseases such as metabolic bone disease. Along with UVB, a blue tegu also needs a temperature gradient. This means that one side of the cage must be cooler, while the other is much warmer and provides a basking spot. This is so they can regulate their body temperature by going to whatever temperature works for them at the moment. Ambient temperatures on the cooler side should be around 75 °F (24 °C) and the warmer side should be about 90 °F (32 °C). They also need the surface of their basking spot to meet specific temperature requirements. For juveniles and younger tegus, they need it around 100 °F (38 °C), though, as they get older, it can go up to 110–120 °F (43–49 °C). For healthy shedding, a humidity of 60-80% is preferred.

Like most lizards, fresh water should be provided daily. Like other tegu species, you should make sure your Argentine black and white tegu has enough water to soak in if they wish. Some tegu species are also known to enjoy swimming and, since they grow to about 1 metre (1 yd) long or more, a medium-sized to large cat litter box can be used as an appropriately sized water dish. Never allow the water level to be above shoulder height for a tegu, as many tegus commonly drown when left without supervision.

Legality

On May 28, 2021 the South Carolina Department of Natural Resources banned importation and breeding, and requires registration of those B&W tegus already in SC.[36][37]

Leather Trade

The Argentine black and white tegu has long been hunted for their skins to supply the international leather trade. They are one of the most exploited reptile species in the world, but trade is legal in most South American countries. It is not an endangered species and overharvesting has not as of yet been monitored.[38]

Distribution

As the name would suggest, this tegu is native to Argentina, but also to Brazil, Paraguay and Uruguay.[39]

Invasive distribution

Argentine black and white tegus have also escaped from the pet trade in Florida[39] and are now an invasive species in Florida,[39][40][41] Georgia[42][43][44] and South Carolina.[45][46] The first sighting of S. merianae in Berkeley County, South Carolina was on September 10, 2020.[46] Eight total sightings in South Carolina have been recorded as of September 10th, 2020.[46]

The Argentine Black and White Tegu has been a particular threat to native wildlife like birds and reptiles that build nests or burrows on the ground. Notably, they exhibit a particular type of both predatory and competitive behavior known as intraguild predation. Argentine tegus will pursue and kill but not eat other native reptiles, which worsens their invasive effect on wildlife. Efforts such as placing traps or localized hunting have been largely unsuccessful in eradicating their egregious effect on non-native environments.[23]

Because of their invasive threat to native and imperiled species, population containment initiatives have been a priority in the past ten years, leading to the extraction of nearly 3,300 tegus from Miami-Dade County alone. Unfortunately such efforts have been difficult. Historically, tegus have survived brutalizing harvests amid the leather trade, marking them a remarkably resilient species.[13]

Taxonomy

The two prominent loreal scales between the eye and nostril of this Argentine black and white tegu, plus its round pupils, identify it as belonging to the genus Salvator.

In 1839, this species of tegu was originally described as Salvator merianae. However, beginning in 1845 and continuing for 154 years, it was confused with Tupinambis teguixin and was considered a synonym of that species. In 1995, it was again given species status as Tupinambis merianae because subsequent studies had shown that the gold tegu (Tupinambis teguixin) was distinct from it. In 2012, the Argentine black and white tegu was reassigned to the resurrected genus Salvator as Salvator merianae.[47]

S. merianae is called the "Argentine black and white tegu" to distinguish it from the "Colombian black and white tegu", which is another name for the gold tegu. Unscrupulous or incompetent pet dealers sometimes pass off gold tegus as Argentine black and white tegus.

S. merianae and T. teguixin can be distinguished by skin texture and scale count:

  • S. merianae has two loreal scales between the eye and the nostril.
  • T. teguixin has only one loreal scale between the eye and the nostril.

In the ecotone between the arid Chaco and the Espinal of central Argentina, they are known to naturally hybridise with the red tegu (Salvator rufescens) with a stable hybrid zone.[48]

See also

References

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Further reading

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