Posts Tagged ‘Columella’

Genus Anelytropsis

Tuesday, November 8th, 2011


At the time of this writing work is being done to determine if the two similar groups formerly known as Dibamidae and Anelytropsidae should be united. Because they are so similar, I have decided to incorporate them here but will provide descriptions which divide the two genera. Functional limbs absent. Tongue short, slightly nicked, and covered with papillae. Palate toothless. Arches absent. Pelvic and pectoral girdles greatly reduced. Eyes and ears concealed by skin. Teeth few, recurved, conical.

The genus Anelytropsis contains one species, A. papillosus. Interorbital septum and columella cranii well developed. Premaxillary bone single. Osteoderms present. No sign of external limbs. This lizard is fossorial and is found in east-central Mexico. It is a fleshy brown above and yellowish below. It has been caught only a very few times and remains known from a dozen specimens. Its diet is suspected to consist of ants and termites.

Dibamus is a genus of some six species distributed in the East Indies between India and New Guinea. The interorbital septum and columella cranii are absent. Premaxillary paired. Osteoderms absent. Males have vestigial traces of hindlimbs. They are usually an olive drab color. These lizards are very slender bodied, secretive, forest-dwelling fossorial animals. They lay hard-shelled eggs, sometimes in communal sites, and are insect eaters.

 

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Anniella Pulchra: A Diminutive Burrower

Sunday, September 25th, 2011


This small family has not yet been seriously allied with any other group, so it maintains the distinctiveness of its own family status. There are but two species, one with two subspecies, found only in California and Baja California. They are limbless lizards lacking an external ear but possessing eyelids and functional eyes. They are very thin bodied, and a giant may be nine inches long. The upper temporal arch is absent. Osteoderms reduced, the scales smooth and subequal. The head is conical, the upper jaw extending far beyond the lower. The tongue is smooth, dark, bifid, and protrusible. Columella cranii absent.

Teeth few, large, recurved, resembling those of Heloderma. The taxa are as follows: silvery legless lizard, Anniella pulchra pulchra; black legless lizard, A. pulchra nigra; and Geronimo legless lizard, A. geronimensis.

These lizards are fossorial and prefer loose soil near moisture, such as beaches. They feed on small invertebrae animals including earthworms. The species are known to be viviparous.

 

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Definition and Terminology

Wednesday, September 21st, 2011


Amniote egg: An egg which contains the embryo in a fluid-filled cavity during development. Such a mechanism is found only in reptiles, birds, and mammals. The membrane which envelopes the cavity is called the amnion.

Arches: Skeletal bridges found in the skull. These arches underlie the region for which they are named. Absent in lizards is the arch formed by the jugal and quadrate bones. This feature is present in the similar tuatara (Sphenodon punctatus) of New Zealand. The arch most typically found in lizards is the temporal arch, formed from the squamosal and postorbital bones.

Atlas: The first vertebral segment, articulating directly to the skull at the occipital condyle.

Axis: The second vertebral segment, which is responsible for the movement of the skull.

Columella cranii: Also known as epipterygoid bone, a rodlike pair of thin shafts found on either side of the braincase.

Crepuscular: Active by dusk or dawn.

Diurnal: Active by day.

Fossorial: Being by nature a burrowing animal.

Homeostasis: The metabolic balancing of bodily functions to a normal state of operation. For example, maintenance of body temperature, water retention, etc.

Jacobson’s organ: A paired sensory mechanism found in the roof of the mouth in certain reptiles. Air particles from outside are brought by the tongue to this organ for analysis. It is essentially an extension of the sense of smell.

Lateral fold: The long margin along the body of certain lizards whose skin contains osteoderms, such as Ophisaurus and Gerrhosaurus. The fold region is devoid of osteoderms, allowing bodily growth.

 

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Dibamidae

Saturday, May 2nd, 2009


If two similar groups formerly known as Dibamidae and Anelytropsidae are similar however they do fall into two genera, Functional limbs absent, tongue short, slightly nicked and covered with papillae, palate toothless , arches absent , pelvic and pectorak girdles greatly reduced.  Eyes and ears are concealed by ski m.  Teeth are few and recurved conical.

The genus Anelytropsis contain one species A. Papillosus Interorbital     and columella cranii well developed.  Pre maxillary bone single.  Osteroderms present.  No sign of external limbs.  This lizard is fossorial and is found in east-central Mexico.  It is fleshy brown above as well as yellow below.  It has been caught only a few times and remains known only from a dozen or so specimems.  Its diet is suspected to consist mainly of ants and termites.

komodo national park – lizards include 9 skink species (scinidae), geckos (gekkonidae), limbless lizards (dibamidae), and, of course, the monitor lizards (varanidae). frogs include the asian bullfrog (kaloula baleata), oreophyne jeffersoniana and oreophyne …

word of the day (for me): lizard – family dibamidae (blind lizards) infraorder scincomorpha family paramacellodidae family slavoiidae family scincidae (skinks) family cordylidae (spinytail lizards) family gerrhosauridae (plated lizards) family xantusiidae (night lizards) …

komodo national park – lizards include 9 skink species (scinidae), geckos (gekkonidae), limbless lizards (dibamidae), and, of course, the monitor lizards (varanidae). frogs include the asian bullfrog (kaloula baleata), oreophyne jeffersoniana and oreophyne …

and columella crania are absent.  Premaxillary paired Osteoderms absent.  Males have vestigial traces of  “hindlimbs.  They are usually an olive drab color.  These lizards are usually slender bodies, secretive , forest dwelling fossorial animals.  They lay hard shelled eggs, sometimes in communal sites and are insect eaters.

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