Placental Carnivores: Past and Present Ilse Kotzee Student

Placental Carnivores: Past and Present Ilse Kotzee Student # 2456349 Landscape Ecology and People University of the Western Cape Available at Placental Carnivore Definition: Placental refers to a mammal who gives birth to live young, which is nourished throughout the pregnancy by placenta; a specialized organ attached to the uterus wall. ( Carnivore refers to any animal whose diet consists mainly out of meat. ( ) Presently there are about 260 placental carnivores (http:// Creodonts and Carnivores Placental carnivores represented by two orders: The now extinct Creodonts The very successful true Carnivores Creodonts Hyeanodon gigas a Primitive carnivorous mammals Long and low scull with primitive brain Head large in proportion to body Short and heavy limbs; long tail; sharp clawed toes

Dominated from late Eocene up to present day Large brain case Good sense of smell Well developed canines Shearing and crushing

teeth Strong body capable of powerful movement Lion Carnivores Adaptations

Differ from insectivores in having special pairs of upper and lower carnassials Dagger like canines used for stabbing, main weapon for killing prey Strong incisor teeth used for nipping Carnivore evolutionary timeline

The Oxyaenids Characteristic long body, short limbs and very long tail Can be compared to martens and cats of today

Diet consisted out of birds, eggs, small mammals and most likely still insects Capable of climbing trees Reconstruction of the cat-like creodont Oxyaena The Hyaenodontids Resembled hyena's and dogs of present time Reached very large sizes Had longer limbs, so were better runners Active predators, able to compete with true carnivores for short time Much more abundant than Oxyaenids

Extinction of Creodonts A change in temperature may have favored the early carnivores No match for the true carnivores with greater intelligence and more specializations Miacids Seen as most primitive representative of True Carnivores Still had primitive features such as; a low scull, elongated body and tail, and short limbs, but larger brain Diet consisted of small animals living in dense undergrowth or in trees Resembled modern day weasels

The Fessipeds Dominated from late Eocene till present time They are the familiar and well known dogs, cats, raccoons, bears, wolves etc. Order divided into two groups; Cannoids and Feloids Division based on anatomical differences Super family: Canoidea The early Cannoids kept much of their primitive characteristics Did show some elongation of limbs and feet Carnassials more specialized for shearing

then in Miacids The brain case was also bigger Has long legs, of all carnivores most adapted for running They are social hunters that rely on speed to chase and pin down

prey Possesses an elongated muzzle and bushy tail Canidae Ursids

In the Miocene dogs started evolving into larger heavier carnivores This could be where the ancestry of bears can be traced Like dogs bears are very adaptable and widely distributed Dentition more suitable for omnivory Panda Procyonids

The Oligocene gave rise to yet another Cannoid A small, climbing carnivore with hand like forepaws, and flexible limbs Differs from dogs in that they walk on the soles of their feet

Like dogs they have 5 toes ending in non retractable claws Kinkajou Mustelids Of all carnivores this group

shows the widest range of adaptive radiation Group consists out of primitive mustelines, the mellivorines, melines, mephitines and the lutrines Can be identified by their tapering body and short legs Each groups diet and behavior is equally diverse Skunk Viverridae

Included in the Feloid carnivores , is one of the oldest carnivores still living today; the civets They first made their appearance in the Eocene and lower Oligocene age The small, forest living genet s ancestry can be closely linked with that of the civets

Genet Herpestidae Recently split from the civet stock due to technical details in anatomy Least known and studied of all carnivores

Small carnivore, with short legs and a long tail Mongoose Hyaenidae Very large and heavy descendant of the civet

Hyena has heavy skull, with strong enlarged teeth for cracking bones Legs are elongated for faster running. Highly specialized carnassials with almost no molars Hyena Nimravidae

The evolution of cats mirrors that of the Hyena only occurring earlier A very successful group that very rapidly evolved into the modern day cats we know today Felidae: Cats Includes the lynxes, lions, leopards, jaguarundi, tigers, bobcats, mountain lions, ocelots and cheetahs

Members of this group are the ultimate carnivores A distinguishing feature is their four toes ending in retractable claws Top class hunters, with acute sense of smell, hearing and excellent balance Felidae: Cats contd. Two groups separates the Felidae into the big cats (genus Panthera) and the small cats (genus Felids) The ability to purr distinguishes these two groups Unable to run for long distances they are excellent sprinters

The Pennipeds Includes the sea lions, walruses and seals First appeared during Oligocene to Miocene Made the move from land to water Four feet are transformed into paddles with webbing between toes Large size, with thick blubber Ottaridae

Represented by eared seals and sea lions Males larger then females Able to dive and remain submerged for extended periods of time Fur has even black color Dentition specialized for eating fish Seal

Odobenidae Represented by walrus A strong carnivore with little to no hair and no external ears Diet consists out of mollusks taken from sea bottom with lips and tusks

Sociable and with groups of 1000 and more also polygamous Phocidae Of all the aquatic carnivores this group is most abundant Known to be monogamous as well as polygamous Hind limbs specialized for swimming cannot be used on land Mottled fur that is spotted or banded

This order is very progressive, and even today new members are being discovered The cat-fox is a potentially new carnivore Discovered in Indonesia (Borneo)

The mammal is slightly larger then a cat, with red fur, a long tail and hind legs longer then the front legs ( Cat-fox) Newly discovered carnivores References:

Colbert E.H., Morales (M) (1991) Evolution of the Vertebrates, 4th Ed. New York Wiley-Liss (Chapter 25) _1991.htm

/...c1.html References: seals.htm walrus.htm yacovella/pages/Fox_jpg.htm

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