As well as the basic tank and its decorations, there are a number of life support systems that may be essential to the well-being of the inmates. These include heating, lighting, humidity, ventilation, and water filtration. All of these systems warrant discussion in some detail.
The aqua-terrarium is one that contains roughly equal land and water areas. Such containers are suitable for those salamanders that spend equal amounts of time on the land and in the water or those that spend the breeding season in an aquatic environment. An ordinary aquarium tank can be used. A partition of glass some 15 cm (6 in) high can be placed across the bottom of the tank and sealed into place to form a watertight barrier between the land and swimming areas. The substrate of the water area can be about 2.5 cm (1 in) deep, thus leaving a water depth of about 12.5 cm (5 in). A rock gradient can be placed up the side of the glass partition to allow easy access and egress of the inmates. The land area is filled to about half with pebbles and coarse gravel to provide drainage. If possible, drainage holes should be made in the base of the land area to prevent excessive waterlogging. A mixture of garden loam, peat, and clean sand can be placed over the pebbles to bring the land up to water level. These materials should be sterilized to reduce the possibility of souring and molding. A slab grassy turf can be placed over the whole land area (this can be changed at regular intervals) or green moss clumps can be used. For extra decoration a couple of dwarf potted plants can be sunk into the substrate, and mossy bark, stone caves, or pieces of broken clay flowerpots can be used to provide shelters for the inmates.
For those with greater ambition, a more natural aqua-terrarium can be made by using a very large tank and building up a rockery at the rear. The tank can be situated in an alcove in the house or conservatory. In such cases, the whole of the aquarium the aqua-terrarium, but free water is not strictly necessary for the welfare of the inmates. However, high humidity is essential and regular misting (with a plant sprayer) must be carried out. For safety’s sake, it is advisable to have a small dish of water available at all times.
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Usually with the smaller ones at the front and graduating to taller specimens at the rear and ends. Larger salamanders can be quite violent with their surroundings and will continually uproot weak plants, so only robust specimens should be used, these being allowed to establish strong root systems before any animals are introduced. Such aquaria are suitable for rearing the larvae of many species of salamanders and newts as well as for permanently keeping those forms that are totally aquatic.
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Nocturnal: Active by night
Occipital condyle: The point at the rear of the skull to which the vertebral column attaches. In reptiles the condyle is single; in amphibians it it paired.
Pentadactyl: Having five digits.
Secondary palate: A bony reinforcement along the roof of the mouth, found principally in skinks.
Temporal fossa: The opening found behind the eye in the skull. In some forms the fossa is roofed over by bone, while in others it exists as a large gap, frequently bordered inferiorly by a temporal arch.
Zygantra: A pair of recesses in the vertebrae of snakes into which the paired zygosphenes insert.
Zygosphenes: Paired projections located on the posterior surface of the vertebrae of snakes. These insert into the zygantra to prevent the serpent’s body from twisting on its axis. These processes are generally not found in lizards.
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A clear luster, but some genera, notably Trachydosaurus and Tribolonotus, have rough or keeled scales. Many forms lack limbs or possess but one pair; there may be five or fewer fingers.
Probably the most problematic genus has been Lygosoma, practically world-wide in distribution and having all stages of limb development. The genus Eumeces is common in the United States and includes the golden Great Plains skink, E. obsoleta, a foot-long lizard of the central states. Trachydosaurus rugosus looks like an animated pair of pinecones, having large scales and a tail resembling the head. The family giant is Corucia zebrata, a two-foot long tree dweller of the Solomon Islands.
The skinks are active, often nervous lizards. They hide under large boulders or in other inaccessible spots but sometimes take to hilly woodsides. They are mainly insectivorous but many also eat plants.
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Related Websites The list of of examples is a long one indeed, but what of function? It is known that the throat fans of some lizards are used to warn intruders infringing on a territory, as well as to attract a mate. The horns of male chameleons are used in territorial battles. The devices of many lizards are for protection, either by physical discomfort (the horns of Phrynosoma) or bluff (Chlamydosaurus). The dorsal sails of lizards like Hydrosaurus and Basiliscus are not fully explained. One idea is that this device is rich in blood vessels and helps to regulate internal temperature. To date, no one is quite sure.
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Related Websites The purely American Anniellidae, consisting of two species, is also mainly subterranean in habits. It is known to be found near moisture, in loose soil such as beaches. Unlike the Dibamidae, Anniella has functional eyes and well developed eyelids.
The Anguinidae, have their share of burrowers, too, such as the well known slow-worm, Anguis fragilis, a worm-eating species found in Britain and continental Europe. They are remarkably long-lived for lizards. being kept in captivity for over 50 years, and are very effective eradicators of the garden slug.
Unique to Australia and New Guinea is a family known as “scaly-footed lizards,” the Pygopodidae. They are characterized by being limbless save for a pair of flaps near the vent. They lack eyelids and the ear may be exposed or hidden.
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Related Websites To this group belong most of the limbless lizards. The creatures discussed here are those that live underground all or most of the time. Typically these lizards are specialized by having cylindrical bodies, pointed snouts, reduced eyes, and the external ear absent. The nostril is usually set horizontally, as opposed to facing upward in most lizards. The head shields are usually enlarged.
Those families whose members are fossorial are the Dibamidae, Anniellidae, some Scincidae, and some Pygopodidae. The earless monitor, Lanthanotus, may be fossorial or at least semifossorial. The genus Dibamus contains six diminutive species found in Southeast Asia. The largest may be eight inches long and the body is very thin as well.
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To date, only one living lizard is known to be marine. This is the Galapagos marine iguana, Amblyrhynchus cristatus. Found most often on the rocky shores of its island home, this lizard will forage in the ocean for its meal of seaweed. This lizard is not a very good swimmer, merely adequate. It can reduce its heartbeat and other bodily functions, probably as an aid in adjusting to the two environments in which it lives.While Amblyrhynchus is unique in being marine, there exist many aquatic or semiaquatic lizards.
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Related Websites To glide from tree to tree or to the ground. Draco have the ability, to some extent, to control their flight in regard to direction and climbing power.
Although not quite as elaborate, two gekkonid genera, Ptychozoon and Mimetozoa, also possess lateral flaps of skin. These lack the support of ribs, however, and act more as parachutes than gliders.
These genera are all tree dwellers and are remarkably adapted for such a way of life. But there are other traits an arboreal lizard can use to advantage, and we find the best example in the true chameleons of the Old World. These species possess a prehensile tail which acts as a fifth foot to grasp a branch and secure a good hold. This trait is not unique to chameleons, though. It is also found in the American alligator lizards (Gerrhonotus) and the Asian bark lizards (Cophotis).
Many other lizards are known to be tree climbers, including the giant monitors of the Varanidae. Some well known tree climbers are the two similar genera Calotes and Japalura. These are long-limbed agamids which feed on the insects that are found in trees. The American Anolis and Iguana, the Solomon Island Corucia, and geckos in general are all arboreal.
The habits may be as diverse as the species. On one extreme is the frail, quick Draco, while on the other is the bulky, slow Chamaeleo. The latter have become so physically slow that they have developed a long sticky (and quick) tongue to secure their prey. The eyes of this group move independently and give a special stereo view of the victim, increasing the accuracy of their aim.
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