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Wednesday, July 22, 2020 | History

4 edition of Upper deciduous dentition of the Oligocene insectivore Leptictis (=Ictops) acutidens found in the catalog.

Upper deciduous dentition of the Oligocene insectivore Leptictis (=Ictops) acutidens

Robert M. West

Upper deciduous dentition of the Oligocene insectivore Leptictis (=Ictops) acutidens

by Robert M. West

  • 14 Want to read
  • 40 Currently reading

Published by [Carnegie Museum] in Pittsburgh .
Written in English

    Places:
  • Montana.
    • Subjects:
    • Leptictis acutidens,
    • Teeth, Fossil -- Montana,
    • Deciduous teeth -- Montana,
    • Paleontology -- Oligocene,
    • Paleontology -- Montana

    • Edition Notes

      Other titlesUpper deciduous dentition of the Oligocene insectivore ...
      StatementRobert M. West.
      SeriesAnnals of Carnegie Museum ; v. 44, article 3, Annals of the Carnegie Museum ;, v. 44, article 3.
      Classifications
      LC ClassificationsAS36 .P7 vol. 44, art. 3, QE882.I5 .P7 vol. 44, art. 3
      The Physical Object
      Paginationp. 25-32 :
      Number of Pages32
      ID Numbers
      Open LibraryOL4282478M
      LC Control Number78308791

      Paleocene to Oligocene. Leptictis, Kennalestes, Gypsonictops, Prodiacodon, Palaeictops, Myrmecoboides, Xenacodon, Insectivorous. Their dentition seemed to be a mixture of rodent and shrew. The incisors were long and project forward. These animals have a pair of carnassial teeth; upper premolar 4 and lower molar 1 are enlarged for shearing. Titanotherium, of the Oligocene of the Dakotas and neighbouring districts, was a huge beast, with the hinder upper premolars similar in character to the molars, a pair of horn-cores, arising from the maxilla, overhanging the nose-cavity, four front and three hind toes, only twenty dorso-lumbar vertebrae, and an almost continuous and unbroken series of teeth, in which the canines are short; the.

      Sparassodonta (from Greek σπαράσσειν [sparassein], to tear, rend; and ὀδούς, gen. ὀδόντος [odous, odontos], tooth) is an extinct order of carnivorous metatherian mammals native to South were once considered to be true marsupials, but are now thought to be either a sister taxon to them, or considerably distantly related, part of a separate clade of Gondwanan.   Palaeontologists have discovered a new fossilized species of insectivore belonging to the unusual and extinct Plesiodimylus family. The identification of this group, related to the fauna that.

      The dentition of the long-eared Indian E. grayi (fig. 7, B) may, on the other hand, be considered characteristic of all the other species, the only important differences being found in the variable size and position of the second upper premolar, which is very small, external and deciduous in the Indian E. micro pus and E. p'ctus. Many types of animals are insectivores, meaning they live primarily off insects and other invertebrates. Many species of birds, fish, reptiles and amphibians fall into this group, as well as a semi-diverse group of mammals. Most insectivorous mammals are small, but some grow to .


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Upper deciduous dentition of the Oligocene insectivore Leptictis (=Ictops) acutidens by Robert M. West Download PDF EPUB FB2

Upper Deciduous Dentition of the Oligocene Insectivore leptictis (=Ictops) Acutidens,Annals, 44 (3):4 figures. [West, R. M.] on *FREE* shipping on qualifying offers. Upper Deciduous Dentition of the Oligocene Insectivore leptictis (=Ictops) Acutidens,Annals, 44 Author: R.

West. Leptictidium (a Latinized diminutive of the name of its close relative Leptictis, which means "graceful weasel" in Ancient Greek) is an extinct genus of small mammals that were likely bipedal.

Comprising eight species, they resembled today's elephant are especially interesting for their combination of characteristics typical of primitive eutherians with highly specialized Class: Mammalia. Abstract. It has been very pertinently remarked by Charles-Dominique and Martin () that comparisons of the Malagasy prosimians with other primates have generally been restricted to Lemur, or, more rarely, to other members of has, in fact, become the stereotype of the group which, for no better reason than its restriction to Madagascar, has been regarded as the result of a Cited by: Upper deciduous dentition of the Oligocene insectivore Leptictis (=Ictops) acutidens Vol Page 25 Celastrina ebenina, a new species of Lycaenidae (Lepidoptera) from the eastern United States.

in the Oligocene insectivore Leptictis acuti Upper deciduous dentition of was probably attained initially in primitive odontocetes by intercalation of permanent and deciduous teeth, and. Insectivore-like mammals have long been known to occur in the Late Cretaceous.

Cimolestes, for instance, flourished in the Latest Cretaceous of North America, and this archaic genus even made it into the Early Paleocene (5, 20).Most species of Cimolestes were mouse- to rat-sized, but the Late Cretaceous Cimolestes magnus reached the size of a marmot, making it one of the largest Mesozoic.

Two species of Parapithecus, primitive catarrhines from the Oligocene of Egypt, show a unique dental adaptation among higher feature, loss of adult lower incisors resulting in an adult dental formula of I?/0 C 1/1 P 3/3 M 3/3, was hinted at by earlier fragmentary specimens and confirmed by a more complete jaw of P.

grangeri found in October ANDRZEJ SULIMSKI ON SOME OLIGOCENE INSECTIVORE REMAINS FROM MONGOLIA (plates XVIII-XIX) Abstract. - Three genera and fivespeciesof OligoceneInsectivora from Mongolia are described, among them one new genus and two new speciesbelonging to two superfamilies:from Erinaceoidea - lctopidium tatalgolensis n.

sp., Amphe­ chinus (Pa/aeoscaptor) acridens (MATl1IEW& GRANG£R. dilambdodont upper molars, a distinct, enlarged, hooklike upper incisor, simple unicuspid teeth between the first upper incisor and the upper fourth premolar, and an enlarged and procumbent anterior.

In all such teeth, the interdental spaces between the upper molars are A AM 7Vpe C 50 4 2 3 FIG. LEFT UPPER AND LOWER TEETH OF A PRIMITIVE INSECTIVORE, Didelphodus absarokae, FROM THE LOWER EOCENE OF WYOMING. X3/1 AFTER MATTHEW.

(COMPARE fig. 47) The sharp blades of the trigonids of the lower molars shear past the blades of the uppers. They have clawed toes on each foot, and the pattern and number of their teeth are rather primitive.

Some insectivores such as otter-shrews and moonrats have a long body. Moles have a more cylindrical body, and hedgehogs have a round body. Some insectivores such as tree moles and shrews are adept tree climbers. Insectivore, the common name applied to any of or so species of mammals—comprising hedgehogs, golden moles, “true” moles, “true” shrews, the moonrat, gymnures, solenodons, and tenrecs—that subsist primarily on insects, other arthropods.

West, R. Upper Deciduous Dentition of the Oligocene Insectivore leptictis (=Ictops) Acutidens. Carnegie Museum of Natural History,Annals, 44 (3). Locomotor apparatus: approaching monotreme mammalian type. Food habits predatory.

Dentition differentiated into incisors, canines, premolars and molars. Deciduous and permanent series as in mammals. Cheek teeth compressed, incipiently triconodont, or with widely oval ridged upper molars articulating with sub-circular lower molar crowns.

Many insectivorous plants have special or modified plant parts to trap insects. The mouth of the insectivorous plants has hair-lined lined edges that snap or shut as soon as the insect touches the hair, thereby, trapping the insects. Some of the plants’ stalks are covered with sticky mucus-like substances where the insect sticks and cannot move.

The Biodiversity Heritage Library works collaboratively to make biodiversity literature openly available to the world as part of a global biodiversity community.

Insectivores have unspecialized sharp teeth and often a crown pattern typical of primitive placentals. Some have front teeth modified by specialized or at times enlarged incisors and canines with a varying morphology, sometimes shaped like incisors or premolars.

Shrews and moles often have dilambdodont upper molars (W-shaped crest pattern). The dentition of the long-eared Indian E. grayi (fig. 7, B) may, on the other hand, be considered characteristic of all the other species, the only important differences being found in the variable size and position of the second upper premolar, which is very small, external and deciduous in the Indian E.

micropus and E. pictus. The former. in the Oligocene insectivore Leptictis acuti-dens (West, ), in which molars erupted before significant wear occurred on deciduous premolars. In some mammals, however, near-ly fully formed permanent premolars lie within the jaw while deciduous premolars are still functional and some molars have not yet erupted (see, e.g., Garn and Lewis.

The Leptictida were a group of Cretaceous-Paleogene eutherians usually thought to be outside crown-group placentals. Although not very diverse, at least some members, particularly the most well known member of the group, Leptictidium, were fully or partially bipedal.

This puts them among a restricted category of bipedal mammals, which also includes macropods, pangolins, and humans. Why this. Jennifer D'Agostino, in Fowler's Zoo and Wild Animal Medicine, Volume 8, Special Physiology. Most insectivores have a very high metabolic rate.

Compared with most mammals, insectivore body temperatures are usually lower (33° C to 35° C), the exception being Sorex spp. (37° C to 38°C). Some species such as the hedgehog exhibit true hibernation for part of the year.*the reduction of the parametastylar and metastylar regions of these same teeth (with some exceptions), in particular with a reduction of the parastylar lobe which rises less in the anterior part of M3 and possibly P4; *a transverse shortening of the upper molarised teeth, which become more square.You can write a book review and share your experiences.

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