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(Redirected from Earless Seal)

The 'true seals' or 'earless seals' are one of the three main groups of mammals within the seal suborder, Pinnipedia. All true seals are members of the family 'Phocidae'. They are sometimes called ''crawling seals'', to distinguish them from the fur seals and sea lions of family Otariidae.
Phocids are the more highly specialized for aquatic life of the two groups and, unlike otariids, lack external ears and cannot bring their hind flippers under their body to walk on them.
They are more streamlined than fur seals and sea lions, and can therefore swim more effectively over long distances than those can. However, because they cannot turn their hind flippers downward, they are very clumsy on land, having to wriggle with their front flippers and abdominal muscles; this method of locomotion is called galumphing.
Additionally, true seals do not communicate by "barking" like the fur seals and sea lions of family Otariidae. They communicate by slapping the water and grunting.

Contents

Feeding and reproduction

Classification

External links

Feeding and reproduction

While otariids are known for speed and maneuverability in the water, phocids are known for efficient, economical movement. This allows most phocids to make long foraging trips to exploit prey resources that are far from land, whereas otariids are tied to rich upwelling zones close to their breeding sites. A pregnant female spends a long period of time foraging at sea, building up her fat reserves, and then returns to the breeding site and uses her stored energy reserves to provide milk for her pup. The common seal (or harbor seal), ''Phoca vitulina,'' displays a reproductive strategy similar to those of otariids, in which the mother makes short foraging trips between nursing bouts.
Because a phocid mother's feeding grounds are often hundreds of kilometers from the breeding site, this means that she must fast while she is lactating. This combination of fasting with lactation is one of the most unusual and extraordinary behaviors displayed by the Phocidae, because it requires the mother seal to provide large amounts of energy to her pup at a time when she herself is taking in no food (and often, no water) to replenish her stores. Because they must continue to burn fat reserves to supply their own metabolic needs while they are feeding their pups, phocid seals have developed an extremely thick, fat-rich milk that allows them to provide their pups with a large amount of energy in as small a period of time as possible. This allows the mother seal to maximize the efficiency of her energy transfer to the pup and then quickly return to sea to replenish her reserves. The length of lactation in phocids ranges from 28 days in the Northern Elephant Seal to just 3–5 days in the Hooded Seal. The nursing period is ended by the mother, who departs to sea and leaves her pup at the breeding site.
Pups will continue to nurse if given the opportunity, and "milk stealers" that suckle from unrelated, sleeping females are not uncommon; this often results in the death of the pup whose mother the milk was stolen from, as any single female can only produce enough milk to provision one pup.
The pup's diet is so high-calorie that the pup builds up a large store of fat. Before the pup is ready to forage on its own, the mother abandons it, and it lives on its fat for weeks or months while it develops independence. Seals, like all marine mammals, need time to develop the oxygen stores, swimming muscles and neural pathways necessary for effective diving and foraging. Seal pups typically eat no food and drink no water during the fast, although some polar species have been observed to eat snow. The postweaning fast ranges from 2 weeks in the Hooded Seal to 9-12 weeks in the Northern Elephant Seal. The physiological and behavioral adaptations that allow phocid pups to endure these remarkable fasts, which are among the longest for any mammal, remain an area of active study and research.

Classification

'SUBORDER PINNIPEDIA'

★ Family Otariidae: fur seals and sea lions

★ Family Odobenidae: Walrus

★ 'Family Phocidae'

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★ 'Subfamily Monachinae'

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★ 'Tribe Monachini'

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★ ''Monachopsis'' (extinct)

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★ ''Pristiphoca'' (extinct)

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★ ''Properiptychus'' (extinct)

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★ ''Messiphoca'' (extinct)

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★ ''Mesotaria'' (extinct)

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★ ''Callophoca'' (extinct)

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★ ''Pliophoca'' (extinct)

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★ ''Pontophoca'' (extinct)

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★ Hawaiian Monk Seal, ''Monachus schauinslandi''

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★ Mediterranean Monk Seal, ''Monachus monachus''

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★ Caribbean Monk Seal, ''Monachus tropicalis'' (probably extinct around 1950)

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★ 'Tribe Miroungini'

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★ Northern Elephant Seal, ''Mirounga angustirostris''

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★ Southern Elephant Seal, ''Mirounga leonina''

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★ 'Tribe Lobodontini'

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★ ''Monotherium wymani'' (extinct)

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★ Ross Seal, ''Ommatophoca rossi''

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★ Crabeater Seal, ''Lobodon carcinophagus''

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★ Leopard Seal, ''Hydrurga leptonyx''

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★ Weddell Seal, ''Leptonychotes weddellii''

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★ Swan-necked Seal, ''Acrophoca longirostris'' (extinct)

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★ ''Piscophoca pacifica'' (extinct)

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★ ''Homiphoca capensis'' (extinct)

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★ 'Subfamily Phocinae'

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★ ''Kawas benegasorum'' (extinct)

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★ ''Leptophoca lenis'' (extinct)

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★ ''Preapusa'' (extinct)

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★ ''Cryptophoca'' (extinct)

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★ Bearded Seal, ''Erignathus barbatus''

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★ Hooded Seal, ''Cystophora cristata''

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★ 'Tribe Phocini'

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★ Common Seal or Harbor Seal, ''Phoca vitulina''

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★ Spotted Seal or Larga Seal, ''Phoca largha''

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★ Ringed Seal, ''Pusa hispida'' (formerly ''Phoca hispida'')

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★ Nerpa or Baikal Seal, ''Pusa sibirica'' (formerly ''Phoca sibirica'')

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★ Caspian Seal, ''Pusa caspica'' (formerly ''Phoca caspica'')

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★ Harp Seal, ''Pagophilus groenlandica'' (formerly ''Phoca groenlandicus'')

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★ Ribbon Seal, ''Histriophoca fasciata'' (formerly ''Phoca fasciata'')

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★ ''Phocanella'' (extinct)

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★ ''Platyphoca'' (extinct)

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★ ''Gryphoca'' (extinct)

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★ Grey Seal, ''Halichoerus grypus''

External links

★ Elephant Seal Research Group - http://www.eleseal.it