| 单词 | premolar |
| 例句 | Toasted just enough to bring out its subtly nutty flavor and, thus, pebbly enough to reduce one of my favorite premolars into a crumble of toothy dust. Perspective | You call it a root canal. I call it a bittersweet symphony. 2021-10-27T04:00:00Z For example, bats with long jaws -- like nectar-feeders -- or intermediate jaws, like many insect-eaters, tended to have the usual complement of three premolars and three molars on each side of the jaw. Fruit, nectar, bugs and blood: How bat teeth and jaws evolved for a diverse dinnertime 2023-10-26T04:00:00Z Until recently, the only reliable way to determine the age of a polar bear has been to extract a premolar and inspect its growth rings. How Old Is That Polar Bear? The Answer Is in Its Blood. 2023-08-10T04:00:00Z Mr. Biden began experiencing dental pain in his lower right premolar on Sunday, according to a letter from White House physician Kevin O’Connor. Biden to undergo root canal; VP Harris to sub for him at White House event 2023-06-12T04:00:00Z These different types of teeth include the incisors, the canines, premolars, and molars. Concepts of Biology 2013-04-25T00:00:00Z One such group—the multituberculates—flourished in the Cretaceous underworld, using their saw-blade premolars and gnawing incisors to devour a new type of food: fruits and flowers. How Mammals Conquered the World after the Asteroid Apocalypse 2022-05-17T04:00:00Z But bats with short jaws, including most fruit-eating bats, tended to ditch the middle premolar or the back molar, if not both. Fruit, nectar, bugs and blood: How bat teeth and jaws evolved for a diverse dinnertime 2023-10-26T04:00:00Z Looking at the teeth, for example, the premolars of H. luzonensis are large and one of them has an extra tooth root—primitive features. Philippine Fossils Add Surprising New Species to Human Family Tree 2019-04-11T04:00:00Z The premolars discovered at Callao Cave are small but still in the range of those of H. sapiens and H. floresiensis. Bone fragments from unknown human relative discovered in Philippine cave 2019-04-09T04:00:00Z “The shape of the second molar, the two premolars and the whole maxilla are very modern,” said Dr. Weber. In Cave in Israel, Scientists Find Jawbone Fossil From Oldest Modern Human Out of Africa 2018-01-25T05:00:00Z Envelopes for submitting the premolar teeth are available at big game checking stations. Hunters reminded to submit bear teeth 2017-08-13T04:00:00Z The team used CT scans and other methods to analyze the shapes and sizes of jaws, premolars and molars in more than 100 noctilionoid species. Fruit, nectar, bugs and blood: How bat teeth and jaws evolved for a diverse dinnertime 2023-10-26T04:00:00Z María Martinón-Torres, a palaeoanthropologist at University College London who attended the talk, thinks that the lower molar looks like those of H. sapiens, whereas the premolar seems a bit more primitive. Human remains found in hobbit cave 2016-09-20T04:00:00Z But the authors report that the overall size of the teeth, as well as the ratio between molar and premolar size, is distinct from those of other members of the genus Homo. Bone fragments from unknown human relative discovered in Philippine cave 2019-04-09T04:00:00Z Based on its teeth—premolars and molars from both the left and right jaw—Microleo was probably an arboreal predator that dined on a variety of other small creatures. This Marsupial Lion Was the Size of a Squirrel The department provides envelopes at big game check stations for submitting the premolar tooth and directions on the back of them for extracting the tooth. Hunters asked to submit bear teeth 2015-09-12T04:00:00Z Two baby molars were found, but the rest of the teeth are adult molars or premolars. Ancient Roman Dentists Were Skilled At Extractions, New Research Shows 2015-05-21T04:00:00Z The size and shape of the primate's teeth — particularly the sharply pointed premolars, which were well adapted for shearing prey — strongly suggest that the tiny mammal fed mostly on insects. Oldest Primate Skeleton Unveiled 2013-06-05T21:15:00.447Z About 4 million years ago, the teeth of hominins such as Au. anamensis began to show thicker enamel and bigger molars and premolars, suggesting a major shift in diet. Human Ancestors Were Grass Gourmands 2012-11-12T20:38:18Z Incisors are absent, and it is not really possible to distinguish between the similar premolars and molars. The anatomy of sloths 2012-08-30T19:15:03.553Z Breadth of rostrum above premolars, the seventh character, is less than in typical specimens of either of the two subspecies. The Recent Mammals of Tamaulipas, Mexico 2012-04-06T02:00:23.953Z At about two and a half years the first premolar replaces its predecessor. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z There are eight pairs of teeth, the first four of which are simpler than the rest, and may perhaps therefore be regarded as premolars. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z These five were all killed in February or March 1969; three were fawns, and two were yearlings that had not yet shed their deciduous premolars. Ecological Studies of the Timber Wolf in Northeastern Minnesota 2011-10-03T02:00:28.037Z There are three basic kinds of teeth: incisors, to bite and gnaw; canines, to stab and seize; and molars and premolars, to grind and chew. Q & A: Life Cycle of a Primate?s Bite 2011-07-04T19:28:55Z Still the differences are great, as, for instance, in the much larger size of the canines and premolars. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z In the Hippoidea there is generally the full series of 44 teeth, but the first premolar is often deciduous or wanting in the lower or in both jaws. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z The premolar has been kept cold, and has been handled as little as possible to prevent contamination with modern DNA. Researchers to drill for ancient DNA in 'hobbit' tooth 2011-01-05T23:15:00.950Z The upper premolar and molar teeth are not alike, the former being single and the latter two-lobed; and the last lower molar of both first and second dentition is almost invariably three-lobed. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" Six incisors, two canines, eight premolars, and six molars existed in each jaw, the series being continuous, no interval existing in the jaw. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli It has also one premolar tooth less in the lower jaw. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The incisors are chisel-shaped, and the canines tend to become isolated so as in the now specialized forms to occupy nearly the middle of a longer or shorter gap between the incisors and premolars. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z Catalogue numbers below are of the United States National Museum, Biological Surveys Collection, and each specimen mentioned by catalogue number is an adult female which shows much wear on the fourth upper premolar. Comments on the Taxonomy and Geographic Distribution of Some North American Rodents Other modifications are the loss of the upper incisors; 697 the development of the canines into projecting tusks; and the loss of the anterior premolars. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" The dentition of Putorius differs from that of Mustela chiefly in the absence of the anterior premolars of both jaws. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" Color yellowish; only one premolar on each side of upper jaw. North American Yellow Bats, 'Dasypterus,' And a List of the Named Kinds Of the Genus Lasiurus Gray The teeth comprise incisors, canines, premolars and molars; and the dental formula never 240 exceeds i. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" The characters given to separate ‘Eutamias’ from Tamias are based only on the absence or presence of the functionless premolar, and on the colour pattern. Genera and Subgenera of Chipmunks The greatest percentage of anomalies is found in the incisors; next come the premolars, the molars, and lastly the canines. Criminal Man According to the Classification of Cesare Lombroso In common with the true palm-civets, they have a dentition numerically identical with that of Viverra and Genetta, but the cusps of the hinder premolars and molars are much less sharp and pointed. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" The hind teeth, consisting of premolars and molars, are used for grinding. The Meaning of Evolution Nycticejus, with the same dental formula as Scotophilus, is distinguished, by the first lower premolar not being crushed in between the adjoining teeth, and the comparatively greater size of the last upper molar. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" Characters previously mentioned in the literature as having taxonomic worth for supraspecific categories of chipmunks were checked by me on specimens old enough to have worn permanent premolars. Genera and Subgenera of Chipmunks In some cases, however, this uniformity is limited to the premolars, which are furnished with tubercles like the molars, a peculiarity of gorillas and orang-outangs. Criminal Man According to the Classification of Cesare Lombroso First premolars often rudimentary or absent; upper molar much larger than the sectorial, longer in the antero-posterior direction than broad; lower sectorial with a very large, low, tuberculated heel. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" "Breadth of rostrum above premolars" is easily duplicated in Lepus but in Sylvilagus the control points are difficult to find. Mammals Obtained by Dr. Curt von Wedel from the Barrier Beach of Tamaulipas, Mexico The two middle incisors are close together, and so large as to conceal the small outer ones, while in the lower jaw there are but two small incisors; the premolars numbering 1/2. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" The incisors, canines, and premolars suffered most, but in one case all the teeth, except the large tubercular molar on each side, were deficient. The Variation of Animals and Plants Under Domestication, Volume II (of 2) After the incisors, the premolars show the greatest number of anomalies. Criminal Man According to the Classification of Cesare Lombroso The number and general arrangement of the teeth are as in Paradoxurus, but the premolars are peculiarly elongated, compressed, pointed and recurved, though the molars are tuberculated. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" The specimen consists of the right ramus of the lower jaw, carrying the third and fourth premolars and the canine. On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331. In those species which have two upper premolars the first is extremely small and internal to the tooth-row. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" The representative of the first premolar is minute and soon shod. The World's Greatest Books — Volume 15 — Science It differs from the genus Felis in the enormous development of the serrated upper canines, as well as the presence of a third lobe on the sectorial edge of the upper premolar.” The Tree-Dwellers The first premolar in both jaws is extremely minute and often deciduous; while the upper molar is much larger than the sectorial, subquadrate, and as broad as long. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" The two genera differ again in the number of premolars. On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331. In both the crown of the head is elevated, the thumb and first phalange of the middle finger are very short, and the premolars are 2/3. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" Between the incisors and premolars of a dog come the characteristic biting teeth, or canines, absent in the rabbit. Text Book of Biology, Part 1: Vertebrata In the machairodus there is no upper true molar at all, while the premolars are reduced to two, there being only these two teeth above, on each side, behind the canine. On the Genesis of Species In the nearly-allied genus Taxidea the dental formula is as in Meles, except that the rudimentary anterior premolars appear to be always wanting in the upper jaw. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" It differs from the next species by a small projecting tooth on the inner margin of the ear conch, by the smaller size of the first upper premolar, and by the colour.—Dobson. Natural History of the Mammalia of India and Ceylon Their teeth are exactly like our own, except that there is one more premolar on each side of each jaw. The Doctrine of Evolution Its Basis and Its Scope The student will probably ask why the cheek teeth, which are all similar in appearance, are divided into premolars and molars. Text Book of Biology, Part 1: Vertebrata Now, as a dentition becomes more distinctly carnivorous, so the hindmost molars and the foremost premolars disappear. On the Genesis of Species The teeth are compressed and sharp-pointed, with a lobe on the inner side of the third, upper premolar not present in the previous genera. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" DESCRIPTION.—Similar to micrura, but with a short tail covered with white hairs, and it has one premolar less. Natural History of the Mammalia of India and Ceylon All apes have large canine teeth, while in man these are no longer than the adjacent incisors or premolars, the whole forming a perfectly even series. Darwinism (1889) Those cheek teeth of the second set, which have predecessors in the first series, are called premolars; the ones posterior to these are the molars. Text Book of Biology, Part 1: Vertebrata But there is another group, the Marmosets, which have the same number of teeth as Eastern monkeys, but differently distributed in the jaws, a premolar being substituted for a molar tooth. Scientific American Supplement, No. 344, August 5, 1882 The tooth beyond on each side is an eye tooth, and the next two on each side are bicuspids, or premolars. A Practical Physiology The dentition of this genus is as follows: Either four or six incisors in the upper jaw, but always six in the lower; four premolars and three molars in each jaw, upper and lower. Natural History of the Mammalia of India and Ceylon Like most of the early mammals, these ungulates had forty-four teeth, the molars with short crowns and quite distinct in form from the premolars. Darwinism (1889) Dentition of rabbit, incisors 2/1, canine 0/0, premolar 3/2, molar 3/3. Text Book of Biology, Part 1: Vertebrata It is unusual to find a full set of teeth in adult bears, as some of the premolars invariably drop out. American Big Game in Its Haunts But it is found, on closer examination, that they have three premolars, like all the western apes, and that only the last molar has been lost. The Evolution of Man — Volume 2 The teeth in some degree resemble Erinaceus, the molars and premolars especially, but the number in all is greater, there being forty-four, or eight more. Natural History of the Mammalia of India and Ceylon The rudimentary first digit of the forefoot has disappeared, and the last premolar has gone over to the molar series. Darwinism (1889) The incisors, canines, and the premolars suffered most, but in one case all the teeth, except the large tubercular molar on each side, were deficient. The Variation of Animals and Plants under Domestication — Volume 2 In deer and bovine animals the incisors and frequently the canines have disappeared from the upper jaw, and the molars are unlike the premolars in having two lobes instead of one. American Big Game in Its Haunts The teeth are short-crowned, the incisors without "mark," or enamel pit, on the cutting edge; the premolars are all smaller and simpler than the molars. Darwin and Modern Science There are many other points also, such as the fawns being spotted, some intestinal peculiarities, and the molar and premolar teeth being strictly cervine, which strengthen him in his opinion. Natural History of the Mammalia of India and Ceylon Two of the premolar teeth are quite like the molars. Darwinism (1889) There were fifty four teeth in all, and the premolars were larger than the molars. A History of Science — Volume 3 The first premolar, situated behind, a little within the line of the canine, is very small, tuberculiform, and a little compressed laterally. Natural History of the Mammalia of India and Ceylon The grinding teeth have assumed the rhinoceros-like pattern and the premolars resemble the molars in form; on the other hand, the front teeth, incisors and canines, have become very small and are useless as weapons. Darwin and Modern Science In the lower jaw the first premolar, instead of being small and tuberculate, as its corresponding tooth in the upper jaw, is large, double-fanged, trenchant and tri-lobed, resembling, except for size, the two following ones. Natural History of the Mammalia of India and Ceylon The grinding teeth are 5—5/4—4 or 4—4/4—4; in the former case the first upper premolar is small, and sometimes deciduous; they are tubercular, at least in youth, and rooted. Natural History of the Mammalia of India and Ceylon The molars are much alike in structure, and can hardly be divided, as they are by some naturalists, into molars and premolars. Natural History of the Mammalia of India and Ceylon Hodgson's dental formula shows one premolar less, viz. teeth: 6/6, 1—1/1—1, 6—6/6—6. Natural History of the Mammalia of India and Ceylon The first premolar in both Indicus and Sondaicus is a deciduous tooth, which is not usually replaced, and gradually drops out with age, but it may be retained till extreme old age. Natural History of the Mammalia of India and Ceylon The third premolar is very large, and agrees with its upper one, excepting the lobule on the inner border. Natural History of the Mammalia of India and Ceylon They take the three hindmost as molars, regarding the others as premolars. Natural History of the Mammalia of India and Ceylon The deciduous or milk teeth are the incisors, canines, and premolars; they drop out and are replaced, and behind the last premolar comes up the permanent molar. Natural History of the Mammalia of India and Ceylon It may interest my readers to know which are premolars and which are molars. Natural History of the Mammalia of India and Ceylon Animals of small size and robust form; short-eared and tailless; two premolars above and below. Natural History of the Mammalia of India and Ceylon The molars are six in number on each side, of which four are premolars, and two true molars. Natural History of the Mammalia of India and Ceylon |
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