Phocids swim by sideways movements of their bodies, using their hind flippers to fullest effect.

Retractable nipples, internal testicles,[15] and an internal penile sheath provide further streamlining. Unlike otariids, true seals do not communicate by 'barking'. As true seals -- family Phocidae members -- harp seals do not have pinnae, which are the protruding segments of ears. All otariids breed on land during well-defined breeding seasons.

Sea lions (left) are brown, bark loudly, "walk" on land using their large flippers and have visible ear flaps. "Use of spectral analysis to test hypotheses on the origin of pinnipeds", "Fur seals and sea lions (Otariidae): identification of species and taxonomic review", "Sexual-size dimorphism: influence of mass and mating systems in the most dimorphic mammals",, Articles with Japanese-language sources (ja), Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, Perrin, W. F., B. Würsig, and J. G. M. Thewissen (2002), This page was last edited on 11 October 2020, at 00:39. Other types of seals without visible ears are harbor seals (Phoca vitulina), Hawaiian monk seals (Monachus schauinslandi) … †Thalassoleon

Despite this, their hearing skills are often rather strong, depending on the situation. An eared seal or otariid or otary is any member of the marine mammal family Otariidae, one of three groupings of pinnipeds. They reside in subpolar, temperate, and equatorial waters throughout the Pacific and Southern Oceans and the southern Indian and Atlantic Oceans.

While considered social animals, no permanent hierarchies or statuses are established on the colonies. Seals live in the oceans of both hemispheres and, with the exception of the more tropical monk seals, are … †Pithanotaria More recent molecular phylogenetic analyses have confirmed the monophyly of the two phocid subfamilies (Phocinae and Monachinae). They are visual feeders. successful males breed with several females. Author: NOAA [7][8] Phocarctos

Secondly, sea lions have small flaps for outer ears. The earless seals, phocids or true seals are one of the three main groups of mammals within the seal lineage, Pinnipedia. The dental formula is: 99 DOI: 10.1126/science.157.3784.99 The earliest known fossil osariid [sic] is Eotaria crypta from southern California,[1] while the genus Callorhinus (northern fur seal) has the oldest fossil record of any living otariid, extending to the middle Pliocene. Sea lions are covered with coarse guard hairs, while fur seals have a thick underfur, which has historically made them the objects of commercial exploitation.


This helps protect the seal from the bends. Last updated: 11/13/19

All true seals are members of the family Phocidae /ˈfoʊsɪdiː/. Because a phocid mother's feeding grounds are often hundreds of kilometers from the breeding site, she must fast while lactating.

Their postcanine teeth are generally simple and conical in shape.

[1][3] Until recently, many researchers believed that phocids evolved separately from otariids and odobenids; and that they evolved from otter-like animals, such as Potamotherium, which inhabited European freshwater lakes. Pregnant females spend long periods foraging at sea, building up fat reserves, and then return to the breeding site to use their stored energy to nurse pups. The extent to which males control females or territories varies between species. However, they can attain higher bursts of speed and have greater maneuverability in the water. More recently, five species have been split off from Phoca, forming three additional genera.

Sea lions (left) are brown, bark loudly, "walk" on land using their large flippers and have visible ear flaps.

The mother ends nursing by leaving her pup at the breeding site to search for food (pups continue to nurse if given the opportunity). Science 07 Jul 1967: Vol.

Some species lack molars altogether. 2nd ed.

Seals have small flippers, wriggle on their bellies on land, and lack visible ear flaps. You have to get very close to see the tiny holes on the sides of a seal’s sleek head.

They are more streamlined than fur seals and sea lions, so they can swim more effectively over long distances. [18], Learn how and when to remove this template message, "A critical revision of the fossil record, stratigraphy and diversity of the Neogene seal genus, "On Prophoca and Leptophoca (Pinnipedia, Phocidae) from the Miocene of the North Atlantic realm: redescription, phylogenetic affinities and paleobiogeographic implications", "A Total Evidence Phylogenetic Analysis of Pinniped Phylogeny and the Possibility of Parallel Evolution Within a Monophyletic Framework", "Multiple markers and multiple individuals refine true seal phylogeny and bring molecules and morphology back in line", "Biogeography and taxonomy of extinct and endangered monk seals illuminated by ancient DNA and skull morphology", "The better to eat you with: the comparative feeding morphology of phocid seals (Pinnipedia, Phocidae)",, Articles with unsourced statements from March 2020, Articles needing additional references from July 2017, All articles needing additional references, Articles needing additional references from May 2013, Creative Commons Attribution-ShareAlike License, This page was last edited on 11 October 2020, at 00:39. This combination of fasting with lactation requires the mother to provide large amounts of energy to her pup at a time when she is not eating (and often, not drinking). In most species, males arrive at breeding sites first and establish and maintain territories through vocal and visual displays and occasional fighting. At the same time, their hind flippers angle backward and don't rotate. It's common for scores of them to haul out together and loll about in the sand, comprising an amorphous pile in the noonday sun. They are sometimes called crawling seals to distinguish them from the fur seals and sea lions of the family Otariidae. [5] The various Antarctic species may have either used the same route, or traveled down the west coast of Africa. Seals have small flippers, wriggle on their bellies on land, and lack visible ear … Although the two subfamilies of otariids, the Otariinae (sea lions) and Arctocephalinae (fur seals), are still widely used, recent molecular studies have demonstrated that they may be invalid. Male otariids range in size from the 70-kg (150-lb) Galápagos fur seal, smallest of all pinnipeds, to the over 1,000-kg (2,200-lb) Steller sea lion.

Otariids are carnivorous, feeding on fish, squid and krill. [6], In the 1980s and 1990s, morphological phylogenetic analysis of the phocids led to new conclusions about the interrelatedness of the various genera. Otariids are adapted to a semiaquatic lifestyle, feeding and migrating in the water, but breeding and resting on land or ice. The words 'otariid' and 'otary' come from the Greek otarion meaning "little ear",[2] referring to the small but visible external ear flaps (pinnae), which distinguishes them from the phocids.

The middle ear is also lined with blood sinuses that inflate during diving, helping to maintain a constant pressure. Retrouvez tous les avis et tests Ears Seal sur Aliexpress France ! The dental formula for eared seals is: OED Online. [14], Phocids are more specialized for aquatic life than otariids.

Under this categorization, the fur seals comprised two genera: Callorhinus in the North Pacific with a single representative, the northern fur seal (C. ursinus), and eight species in the Southern Hemisphere under the genus Arctocephalus; while the sea lions comprise five species under five genera. [12], Adult phocids vary from 1.17 m (3.8 ft) in length and 45 kg (99 lb) in weight in the ringed seal to 4.9 m (16 ft) and 2,400 kg (5,300 lb) in land-based members of the Carnivora, although they retain powerful canines. [4], Monk seals and elephant seals are believed to have first entered the Pacific through the open straits between North and South America, which only closed in the Pliocene.

Some females are capable of dives of up to 400 m (1,300 ft). All true seals are members of the family Phocidae /ˈfoʊsɪdiː/. Phocids produce thick, fat-rich milk that allows them to provide their pups with large amounts of energy in a short period.

[7][8][9][5] The Monachinae (known as the "southern" seals), is composed of three tribes; the Lobodontini, Miroungini, and Monachini. Though their bodies can appear chubby, seals are generally smaller and more aquadynamic than sea lions.

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