Posts Tagged ‘Cavity’

More on Proper Heating

Thursday, January 12th, 2012


One of the most satisfactory ways of heating insects in the undergrowth for the remaining part of the summer and early autumn, usually confining their activities to the nighttime or dusk and dawn. During the day both adults and newly metamorphosed young will hide in some safe cavity, perhaps under or within rotten fallen timber, under rocks, or in the leaf litter. The adults lose their breeding dress during the terrestrial stage, the male losing his crest and dorsal pattern, becoming plain black above but retaining the bright orange and black belly.

Many species of newts and salamanders possess bright colors that act as a warning to predators that they are poisonous or distasteful.

 

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The Mcllwraith gecko (Orraya occultus)

Tuesday, July 5th, 2011


We began to wonder if we were at a high enough altitude for leaftails. Of course, the answer to this was to continue further up the gorge. We investigated every eyeshine in hopes of finding something other than ring-tailed geckos.

I detected a pale eyeshine on the flat underside of a boulder approximately 300 feet upstream from our campsite. A feeling of excitement tinged with a little fear of losing sight of the animal washed over me as I approached, concentrating on the small points of light. As I got closer, the eyeshine became stronger and the outline of the animal began to emerge.

This was definitely not a ring-tailed gecko, but rather a very flat, spiny animal that could only be a leaftail. Without delay I grabbed the animal for identification – yes! The first Mcllwraith leaftail found in 15 years and only the fourth specimen ever found! If that was not enough, this specimen had an original tail; all the previous specimens had regenerated tails.

Around the same time, another team member uncovered another specimen. This one clung to a bare rockface hidden within a cavity beneath boulders; it had a regenerated tail and also two partially developed eggs.

This gecko species is extremely gaunt and elongated, almost emaciated in appearance, with a flattened head and body, and long thin limbs. The cervical vertebrae are extremely elongated, resulting in an extraordinarily long, thin neck. This species also differs from other leaftails in possessing three lumbar vertebrae as opposed to two, causing it to be placed in a separate genus. The dorsal surface is covered with spiny tubercles. The original, leaf-shaped tail has tubercles with clusters of two to three pointed spines around its perimeter and more blunt, longitudinally aligned tubercles on its dorsal surface.

The next morning we spent photographing leaftails and other herp species found at the location, before following the creek back to our base camp at Rocky Scrub. We has successfully located and photographed the Mcllwraith leaf-tailed gecko, observed Australia’s longest gecko and two herp species endemic to the Mcllwraith Range, the long-snouted frog and the Coen rainbow skink.

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Iguana’s Anatomy

Monday, March 1st, 2010


Above the ocular cavity is a bone or pair of bones called the frontals. This is a centrally located bone met anteriorly by the nasals or occasionally the prefrontal. It is bordered posteriorly by the parietal. Along the border of the frontal and parietal, or often in the center of the parietal, may be found a single round hole. It is in this small aperture that the pineal gland or third eye is located. In species lacking the eye, this pineal foramen is often absent.

There may be a temporal arch, an arch of bone created by the postorbital and squamosal bones. The lower arch, formed by an extension of the jugal with the quadrate, is not found in lizards, but does occur in the tuatara, Sphenodon, a lizard-like animal of New Zealand. In some lizards and all snakes the upper temporal arch is lacking; in these forms the squamosal bone is rudimentary or absent.

One last aspect of the skull that should be mentioned is the occipital condyle, the point where the cranium is fixed to the skull. This is a point of bone (single in lizards and the other reptiles) where the first vertebra, the atlas, attaches to the skull. It is not always at the hindmost part of the skull.

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Jacobson’s Organ

Monday, January 26th, 2009


This celebrated feature is probably better developed in snakes than lizards. It is a system of nerves entering a cavity in the roof of the mouth.  When air particles are collected with the tongue, the lizard places the tongue against this organ for analysis.

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