Boids are, however, distinguished from the pythons in that none have postfrontal bones or premaxillary teeth, and that they give birth to live young.

Then, there is some scant but highly informative fossil evidence assigned to this family: a premaxillary tooth was found in the Colombian Villavieja Formation and dated to the Laventan age about 13. 5-11. 5 mya, while some pharyngeal teeth and other jaw parts found near Cuenca, Ecuador in the Cuenca basin ( a structural basin ) are about 19 million years old.

The eight premaxillary teeth at the front of the snout were smaller than the rest, closely packed and D-shaped in cross section.

In Gorgosaurus, the first tooth in the maxilla was also shaped like the premaxillary teeth.

Along with the eight premaxillary teeth, Gorgosaurus had 26 to 30 maxillary teeth and 30 to 34 teeth in the dentary bones of the lower jaw.

As noted, Elasmosaurus can be distinguished by its six premaxillary teeth and 71 cervical vertebrae.

The maxillary and dentary teeth are laterally compressed, sometimes with a slightly serrate cutting edge, while the premaxillary teeth are conical.

There are 78 premaxillary teeth, 10 maxillary and 13 dentary teeth.

However, subsequently discovered specimens have been reported to preserve small premaxillary teeth.

There were three premaxillary teeth, with the first two small and conical and the third enlarged to form the upper caniniform, counterpart to the even larger lower caniniform, which was the first dentary tooth.

In the upper jaw, a large gap ( or diastema ) accommodated the lower caniniform tooth and separated the premaxillary teeth from the wider chewing teeth of the maxilla.

The synapomorphies alleged to distinguish the Aublysodontinae, especially lack of serrations on premaxillary teeth could have been caused by tooth wear in life, postmortem abrasion, or digestion.

In contrast, Gregory S. Paul ( 1988 ) depicted the skull with only three premaxillary teeth remaining, much smaller than those illustrated by Osborn.

The term " mandible " also refers to both the upper and lower sections of the beaks of birds ; in this case the " lower mandible " corresponds to the mandible of humans, while the " upper mandible " is functionally equivalent to the human maxilla but mainly consists of the premaxillary bones.

* I. Quadrate articulating with the cranium, supratemporal absent ; mandible much shorter than the skull, with coronoid bone ; maxillary small, on lower aspect of cranium ; pterygoids not extending to quadrate ; nasals forming long sutures with the premaxillary, prefrontals, and frontal: Typhlops.

However, in 1892 Aublysodon became an independent genus when Othniel Charles Marsh further limited its type by choosing a single small nonserrated premaxillary tooth with a D-shaped cross-section, specimen ANSP 9535, as the lectotype of Aublysodon mirandus.

The least severe in the spectrum of facial anomalies is the median cleft lip, also called premaxillary agenesis.

While in the egg, the Squamata embryo develops an egg tooth on the premaxillary that helps the animal emerge from the egg.

In bony fish, the vomers are flattened, paired, bones forming the anterior part of the roof of the mouth, just behind the premaxillary bones.

For example, the crocodile-like archosaurian reptile Parasuchus hislopi Lydekker, 1885 was described based on a premaxillary rostrum ( part of the snout ), but this is no longer sufficient to distinguish Parasuchus from its close relatives.

Euteleostomes originally all had endochondral bone, fins with lepidotrichs, and jaws lined by maxillary, premaxillary, and dentary bones.

Its tooth-bearing premaxillary and maxillary bones are fused like in all Dipnoi.

The fossil consists only of the front part of the head, which is characterized by the fact that it is very narrow and carries a premaxillary sagittal crest.

The premaxillary bone is single and small, and as a rule connected with the maxillary only by ligament.

In the former this bone is loosely attached to the lower aspect of the cranium ; in the latter it borders the mouth, and is suturally joined to the premaxillary and the prefrontal.

At once my ears were drowned by a flow of what I took to be Spanish, but -- the driver's white teeth flashing at me, the road wildly veering beyond his glistening hair, beyond his gesticulating bottle -- it could have been the purest Oxford English I was half hearing ; ;

Pa had his head up, glaring, his teeth gnawing at the place where he'd grown a mustache once.

Since Mr. Clark believes firmly that the chewing of hard foods helps develop healthy gums and teeth, raw vegetables and raw whole-wheat grains are handed out with fresh fruit and whole-wheat cookies at snack time in the afternoons.

If a child loses a molar at the age of two, the adjoining teeth may shift toward the empty space, thus narrowing the place intended for the permanent ones and producing a jumble.

If baby teeth are retained too long, the incoming second teeth may be prevented from emerging at the normal time or may have to erupt in the wrong place.

`` After your child's baby teeth are all in -- usually at the age of two and one half to three -- it's time for that first dental appointment '', Dr. Brodie advises.

Her teeth chattered so that she made three attempts at speech before she became intelligible.

I don't remember ever seeing teeth that were quite so white and at the same time quite so emphatically not dentures.

An affinity between the amphibians and the teleost fish is the multi-folded structure of the teeth and the paired supra-occipital bones at the back of the head, both features not found elsewhere in the animal kingdom.

Adult aardvarks have only cheek teeth at the back of the jaw, and have a dental formula of:

Between 1999 and 2003, a multidisciplinary team led by Sileshi Semaw discovered bones and teeth of nine A. ramidus individuals at As Duma in the Gona Western Margin of Ethiopia's Afar Region.

Its long jaws contained, both sides combined, 58 or more banana-shaped teeth ; larger tyrannosaurids possessed fewer teeth, Gorgosaurus at least sixty-two.

The old placoderms did not have teeth at all, but had sharp bony plates in their mouth.

The graphs on the right side depict the ( finite ) coefficients that modulate the infinite amplitudes of a comb function whose teeth are spaced at the reciprocal of the time-domain periodicity.

Certainly Eugene's appearance was not impressive – " He was never good looking …" wrote the Duchess of Orléans, " It is true that his eyes are not ugly, but his nose ruins his face ; he has two large teeth which are visible at all times.

Callet's method of brass embouchure consists of the tongue remaining forward and through the teeth at all times.

The graphs on the right side depict the ( finite ) coefficients that modulate the infinite amplitudes of a comb function whose teeth are spaced at intervals of 1 / P.

It is roofed by slabs of stone laid at a slightly steeper angle than the floor of the gallery, so that each stone fits into a slot cut in the top of the gallery like the teeth of a ratchet.

Labiolingually, their mandibles are much stronger at the canine teeth than in canids, reflecting the fact that hyenas crack bones with both their anterior dentition and premolars, unlike canids, which do so with their post-carnassial molars.

They have sharp incisors to clip leaves at the front of the mouth, separated from the grinding cheek teeth by a wide diastema.

Uniquely among mammals, these teeth are continuously replaced throughout life, with new teeth growing at the rear as older teeth fall out from farther forward in the mouth.