Go to start of metadata Fig. Overview The green crested lizard Bronchocela cristatella Kuhl, is native to Singapore and endemic to Southeast Asia [ 1 , 2 ]. In the recent years, it has allegedly faced competition by the Changeable lizard Calotes versicolor Daudin, which was introduced in the s and now its distribution is restricted to forested areas of Singapore, while the latter occupies urban park localities 1 2 3. These diurnal green crested lizards are arboreal and frequently found resting or climbing tree trunks in forested areas 4 5. The family Agamidae is known for distinctly long tails, as seen in their diversity in different biogeographic regions 6.
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Go to start of metadata Fig. Overview The green crested lizard Bronchocela cristatella Kuhl, is native to Singapore and endemic to Southeast Asia [ 1 , 2 ]. In the recent years, it has allegedly faced competition by the Changeable lizard Calotes versicolor Daudin, which was introduced in the s and now its distribution is restricted to forested areas of Singapore, while the latter occupies urban park localities 1 2 3.
These diurnal green crested lizards are arboreal and frequently found resting or climbing tree trunks in forested areas 4 5. The family Agamidae is known for distinctly long tails, as seen in their diversity in different biogeographic regions 6. Green crested lizards exhibit these characteristics and also display interesting behaviour and morphology that allows the laymen to identify it easily 7 1. Different kinds of lizards [2. While many may be familiar with the common house gecko as a "lizard", there are many other lizards with much more exciting behaviour, novel patterns and colouration 1 7.
Lizards belong under Suborder Lacertilia, with infraorders Iguania and Gekkonidae 8. Lizards can be classified according morphology, molecular data as well as their habit or other behaviour such as colour change 9 7.
Image with background modified and taken from Teyssier et al. How do we identify them? Important features to look out for include large and easily identifiable characteristics on the head Figure 4a and overall body characteristics that allows identification from afar 1 7. Characteristics such as black ear and eye-ring, together with defined nuchal crests make quick identification easy 1 7.
Other chracteristics such as colour change and egg shape can also be helpful in providing evidence for identification 7 1. If specimens are at hand, more detailed measurements of snout to vent length and body length will be obtained for more rigorous identification exercises, especially in the case, where scientists suspected that they have found a new species 11 Edition Chimaira.
Das, I. A field guide to the reptiles of South-East Asia. Bloomsbury Publishing. Diong, C. Difference 2: Body snout-to-vent length versus Tail length Fig. Interesting behaviours [4. In this video, you can see agressive behaviour being associated with colour change from green to brown. Aggression occurs when there are territorial disputes Quah, pers. This colour change also occurs when they are being predated upon. Images from Quah et al. Both the green crested lizard and the changeable lizard undergo colour change in the breeding season 14 4 5 7.
The green crested lizard turns dark brown and displays an orange throat pouch while the changeable lizard turns from light grey to reddish with a red and black throat 4. Such colour changes only appear in males and are part of a display to attract females to mate with them 4. The mating display also includes male erection of the nuchal crest while the throat pouch inflates 4.
Fig 12a and b:Images of male mounting a female to mate, with the male turning back to green after mating has ended. Annotations added, given description in the same paper. Just before mating, males turn brown, almost black and display their orange pouch prominently 4. Males then hold females by the neck and mount them, while females remain bright green 4. Where can you find them? This species can be found in many pet stores, especially online pet stores that export oriental lizard species in the region Large terrariums with natural greenery are constructed with suitable temperature and humidity to maintain them as pets [ 5 ].
Image taken by Cheryl Leem. However, alleged competition with the Changeable Lizard Calotes versicolor in possibly the same ecological niche has made it harder to spot in urban green spaces 4 7. The Changeable Lizard can be mostly found in parks while the Green crested lizard can be found in more protected areas 21 3. Life history Individuals are expected to live more than 10 years After mating, these oviparous lizards lay eggs in the external environment, which hatch to give the young Females lay fusiform eggs in the soil in groups of eggs at once in soil 23 7 1.
These eggs require days of incubation before hatching Ecological interactions with other animals Fig. Green crested lizards feed on a wide variety of prey that are mostly insects, including ants, beetles, cicadas, crickets, flies, grasshoppers, stick insects, etc. Eating incidents have been infrequently observed because the Green crested lizard eats and swallows its prey within seconds. At times, it has been observed to also feed on skinks.
However, green crested lizards are not only predated upon by large predators; their bodies are are fed upon by weaver ants when they die. Fig 17b: Ants feeding off dead body of green crested lizard.
Taxonomy and Systematics.
Species was not fully specified, species name missing!
Synonyms are scientific names that actually refer to the same group. Synonyms arise when earlier names are shown to be erroneous and the same specimen is instead allocated to a new name as its features are deemed more similar to a new group. Bronchocela cristatella used to be named firstly as Agama cristatella by Kuhl in [ 1 , 30 ]. However, over the years, the species changed names multiple times owing to re-categorisation [ 1 , 28 ]. The original description by Kuhl based on type specimens deposited in the Paris Museum, but the type locality was not given [ 12 ]. It was also revealed that the synonym Pseudocalotes archiducissae was never a valid name under the International Commision on Zoological Nomenclature ICZN , for there never was a proper description published by Fitzinger[ 29 ]. This eventually leads the reader to determine what species or genus a particular specimen belongs to [ 2 ].
Table of Contents
Description[ edit ] This species is a bright green lizard, sometimes possessing a blue tint on the head. It is able to change colour, turning darker brown when threatened. There is a dark ring around each eye, and a dark spot at the back of the head. The males have a crest on the neck. From C. Scales of the sides small, there being about forty in one of the transverse scries; ventral scales much larger, in fourteen longitudinal rows. A short scries of three or four larger scales forms a continuation of the superciliary margin; no other large scale on the temple.