The leopard seal (''Hydrurga leptonyx''), also referred to as the sea leopard, is the second largest species of
seal
Seal may refer to any of the following:
Common uses
* Pinniped, a diverse group of semi-aquatic marine mammals, many of which are commonly called seals, particularly:
** Earless seal, or "true seal"
** Fur seal
* Seal (emblem), a device to impr ...
in the
Antarctic
The Antarctic ( or , American English also or ; commonly ) is a polar region around Earth's South Pole, opposite the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica, the Kerguelen Plateau and other ...
(after the
southern elephant seal
The southern elephant seal (''Mirounga leonina'') is one of two species of elephant seals. It is the largest member of the clade Pinnipedia and the order Carnivora, as well as the largest extant marine mammal that is not a cetacean. It gets it ...
). Its only natural predator is the
orca
The orca or killer whale (''Orcinus orca'') is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member. It is the only extant species in the genus '' Orcinus'' and is recognizable by its black-and-white ...
.
[ It feeds on a wide range of prey including cephalopods, other ]pinnipeds
Pinnipeds (pronounced ), commonly known as seals, are a widely range (biology), distributed and diverse clade of carnivorous, fin-footed, semiaquatic, mostly marine mammal, marine mammals. They comprise the extant taxon, extant family (biology ...
, krill
Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian
Norwegian, Norwayan, or Norsk may refer to:
*Something of, from, or related to Norway, a country in n ...
, fish, and birds, particularly penguins
Penguins (order Sphenisciformes , family Spheniscidae ) are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere: only one species, the Galápagos penguin, is found north of the Equator. Highly adapt ...
. It is the only species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
in the genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
''Hydrurga''. Its closest relatives are the Ross seal
The Ross seal (''Ommatophoca rossii'') is a true seal (family Phocidae) with a range confined entirely to the pack ice of Antarctica. It is the only species of the genus ''Ommatophoca''. First described during the Ross expedition in 1841, it is ...
, the crabeater seal
The crabeater seal (''Lobodon carcinophaga''), also known as the krill-eater seal, is a true seal with a circumpolar distribution around the coast of Antarctica. They are medium- to large-sized (over 2 m in length), relatively slender and pale-c ...
and the Weddell seal
The Weddell seal (''Leptonychotes weddellii'') is a relatively large and abundant true seal with a circumpolar distribution surrounding Antarctica. The Weddell seal was discovered and named in the 1820s during expeditions led by British seali ...
, which together are known as the tribe
The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide usage of the term in English language, English is in the discipline of anthropology. This definition is contested, in p ...
of Lobodontini
The true seal tribe Lobodontini, collectively known as the Antarctic seals or lobodontin seals, consist of four species of seals in four genera: the crabeater seal (''Lobodon carcinophaga''), the leopard seal (''Hydrurga leptonyx''), the Weddell ...
seals. The name ''hydrurga'' means "water worker" and ''leptonyx'' is the Greek for "thin-clawed".
Taxonomy
French zoologist Henri Marie Ducrotay de Blainville
Henri Marie Ducrotay de Blainville (; 12 September 1777 – 1 May 1850) was a French zoologist and anatomist.
Life
Blainville was born at Arques, near Dieppe. As a young man he went to Paris to study art, but ultimately devoted himself to natur ...
described the leopard seal in 1820.
Description
The leopard seal has a distinctively long and muscular body shape when compared to other seals, but it is perhaps best known for its massive jaws, which allow it to be one of the top predators in its environment. The front teeth are sharp like those of other carnivores, but their molars
The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals. They are used primarily to grind food during chewing. The name ''molar'' derives from Latin, ''molaris dens'', meaning "millstone to ...
lock together in a way that allows them to sieve krill
Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian
Norwegian, Norwayan, or Norsk may refer to:
*Something of, from, or related to Norway, a country in n ...
from the water in the manner of the crabeater seal
The crabeater seal (''Lobodon carcinophaga''), also known as the krill-eater seal, is a true seal with a circumpolar distribution around the coast of Antarctica. They are medium- to large-sized (over 2 m in length), relatively slender and pale-c ...
. The coat is counter-shaded with a silver to dark gray blend and a distinctive spotted " leopard" coloration pattern dorsally and a paler, white to light gray color ventrally. Females are slightly larger than males. The overall length of adults is and weight is from making them the same length as the northern walrus
The walrus (''Odobenus rosmarus'') is a large pinniped, flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in ...
but usually less than half the weight. The whiskers
Vibrissae (; singular: vibrissa; ), more generally called Whiskers, are a type of stiff, functional hair used by mammals to sense their environment. These hairs are finely specialised for this purpose, whereas other types of hair are coarse ...
are short and clear.
As "true" seals, they do not have external ears or ''pinnae'', but possess an internal ear canal that leads to an external opening. Their hearing in air is similar to that of a human, but scientists have noted that leopard seals use their ears
An ear is the organ that enables hearing and, in mammals, body balance using the vestibular system. In mammals, the ear is usually described as having three parts—the outer ear, the middle ear and the inner ear. The outer ear consists o ...
in conjunction with their whiskers to track prey under water.
Distribution
Leopard seals are pagophilic
Pagophily or pagophilia is the preference or dependence on water ice for some or all activities and functions. The term ''Pagophila'' is derived from the Ancient Greek ''pagos'' meaning "sea-ice", and ''philos'' meaning "-loving".
Pagophilic ani ...
("ice-loving") seals, which primarily inhabit the Antarctic pack ice
Drift ice, also called brash ice, is sea ice that is not attached to the shoreline or any other fixed object (shoals, grounded icebergs, etc.).Leppäranta, M. 2011. The Drift of Sea Ice. Berlin: Springer-Verlag. Unlike fast ice, which is "fasten ...
between 50˚S and 80˚S. Sightings of vagrant leopard seals have been recorded on the coasts of Australia, New Zealand (where individuals have been seen even on the foreshores of major cities such as Auckland
Auckland (pronounced ) ( mi, Tāmaki Makaurau) is a large metropolitan city in the North Island of New Zealand. The List of New Zealand urban areas by population, most populous urban area in the country and the List of cities in Oceania by po ...
, Dunedin
Dunedin ( ; mi, Ōtepoti) is the second-largest city in the South Island of New Zealand (after Christchurch), and the principal city of the Otago region. Its name comes from , the Scottish Gaelic name for Edinburgh, the capital of Scotland. Th ...
and Wellington
Wellington ( mi, Te Whanganui-a-Tara or ) is the capital city of New Zealand. It is located at the south-western tip of the North Island, between Cook Strait and the Remutaka Range. Wellington is the second-largest city in New Zealand by me ...
), South America, and South Africa. In August 2018, an individual was sighted at Geraldton
Geraldton ( Wajarri: ''Jambinu'', Wilunyu: ''Jambinbirri'') is a coastal city in the Mid West region of the Australian state of Western Australia, north of the state capital, Perth.
At June 2018, Geraldton had an urban population of 37,648. ...
, on the west coast of Australia. Higher densities of leopard seals are seen in the Western Antarctic than in other regions.
Most leopard seals remain within the pack ice throughout the year and remain solitary during most of their lives with the exception of a mother and her newborn pup. These matrilineal groups can move further north in the austral winter to sub-antarctic islands and the coastlines of the southern continents to provide care for their pups. While solitary animals may appear in areas of lower latitudes, females rarely breed there. Some researchers believe this is due to safety concerns for the pups. Lone male leopard seals hunt other marine mammals and penguins in the pack ice of antarctic waters. The estimated population of this species ranges from 220,000 to 440,000 individuals, putting leopard seals at "least concern". Although there is an abundance of leopard seals in the Antarctic, they are difficult to survey by traditional visual techniques because they spend long periods of time vocalizing under the water during the austral spring and summer, when visual surveys are carried out. The trait of vocalizing underwater for long periods means they can be the subject of acoustic surveys, allowing researchers to gather most of what is known about them.
Behavior
Acoustic behavior
Leopard seals are very vocal underwater during the austral summer.
The male seals produce loud calls (153 to 177 dB re 1 μPa at 1 m) for many hours each day. While singing the seal hangs upside down and rocks from side to side under the water. Their back is bent, the neck and cranial thoracic region (the chest) is inflated and as they call their chest pulses. The male calls can be split into two categories: vocalizing and silencing, in which vocalizing is when they are making noises underwater, and silencing noted as the breathing period at the air surface. Adult male leopard seals have only a few stylized calls, some are like bird or cricket-like trills yet others are low haunting moans. Scientists have identified five distinctive sounds that male leopard seals make, which include: the high double trill, medium single trill, low descending trill, low double trill, and a hoot with a single low trill. These cadence of calls are believed to be a part of a long range acoustic display for territorial purposes, or the attraction of a potential mate. The leopard seals have age-related differences in their calling patterns, just like birds. Where the younger male seals have many different types of variable calls – the adult male seals have only a few, highly stylized calls. Each male leopard seal produces these individual calls, and can arrange their few call types into individually distinctive sequences (or songs). The acoustic behavior of the leopard seal is believed to be linked to their breeding behaviour. In male seals, vocalizing coincides with the timing of their breeding season, which falls between November and the first week of January; captive female seals vocalize when they have elevated reproductive hormones. Conversely, a female leopard seal can attribute calls to their environment as well; however, usually it is to gain the attention of a pup, after getting back from a forage for food.
Breeding habits
Since leopard seals live in an area difficult for humans to survive in, not much is known on their reproduction and breeding habits. However, it is known that their breeding system is polygynous, meaning that males mate with multiple females during the mating period. A sexually active female (ages 3–7) can give birth to a single pup during the summer on the floating ice floes of the Antarctic pack ice, with a sexually active male (ages 6–7). Mating occurs from December to January, shortly after the pups are weaned when the female seal is in estrus.["Reproduction - Encyclopedia of Life". Encyclopedia of Life. Retrieved 2018-05-15.] In preparation for the pups, the females dig a circular hole in the ice as a home for the pup. A newborn pup weighs around 66 pounds and are usually with their mother for a month, before they are weaned off. The male leopard seal does not participate in taking care of the pup, and goes back to its solitary lifestyle after the breeding season. Most leopard seal breeding is on pack ice.
Five research voyages were made to Antarctica in 1985, 1987 and 1997–1999 to look at leopard seals. They sighted seal pups from the beginning of November to the end of December, and noticed that there was about one pup for every three adults, and they also noticed that most of the adults were staying away from other adults during this season, and when they were seen in groups they showed no sign of interaction. Leopard seal pups mortality rate within the first year is close to 25%.
Vocalization is thought to be important in breeding, since males are much more vocal around this time. Mating takes place in the water, and then the male leaves the female to care for the pup, which the female gives birth to after an average gestation period of 274 days.
Research shows that on average, the aerobic dive limit for juvenile seals is around 7 minutes, which means that during the winter months juvenile leopard seals do not eat krill, which is a major part of older seals' diets, since krill is found deeper during this time. This might occasionally lead to co-operative hunting. Co-operative hunting of leopard seals on Antarctic fur seal pups has been witnessed, which could be a mother helping her older pup, or could also be female-male couple interactions, to increase their hunting productivity.
Foraging behavior
]
The only natural predator of leopard seals is the orca
The orca or killer whale (''Orcinus orca'') is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member. It is the only extant species in the genus '' Orcinus'' and is recognizable by its black-and-white ...
. The seal's canine teeth
In mammalian oral anatomy, the canine teeth, also called cuspids, dog teeth, or (in the context of the upper jaw) fangs, eye teeth, vampire teeth, or vampire fangs, are the relatively long, pointed teeth. They can appear more flattened howeve ...
are up to long. It feeds on a wide variety of creatures. Young leopard seals usually eat mostly krill
Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian
Norwegian, Norwayan, or Norsk may refer to:
*Something of, from, or related to Norway, a country in n ...
, squid and fish
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of li ...
. Adult seals probably switch from krill to more substantial prey, including king
King is the title given to a male monarch in a variety of contexts. The female equivalent is queen, which title is also given to the consort of a king.
*In the context of prehistory, antiquity and contemporary indigenous peoples, the tit ...
, Adélie, rockhopper, gentoo, emperor
An emperor (from la, imperator, via fro, empereor) is a monarch, and usually the sovereignty, sovereign ruler of an empire or another type of imperial realm. Empress, the female equivalent, may indicate an emperor's wife (empress consort), ...
and chinstrap penguins, and less frequently, Weddell, crabeater, Ross Ross or ROSS may refer to:
People
* Clan Ross, a Highland Scottish clan
* Ross (name), including a list of people with the surname or given name Ross, as well as the meaning
* Earl of Ross, a peerage of Scotland
Places
* RoSS, the Republic of Sou ...
, and young southern elephant seal
The southern elephant seal (''Mirounga leonina'') is one of two species of elephant seals. It is the largest member of the clade Pinnipedia and the order Carnivora, as well as the largest extant marine mammal that is not a cetacean. It gets it ...
s. Leopard seals are also known to take fur seal
Fur seals are any of nine species of pinnipeds belonging to the subfamily Arctocephalinae in the family '' Otariidae''. They are much more closely related to sea lions than true seals, and share with them external ears (pinnae), relatively lon ...
pups.
Around the sub-Antarctic island of South Georgia, the Antarctic fur seal
The Antarctic fur seal (''Arctocephalus gazella''), is one of eight seals in the genus ''Arctocephalus'', and one of nine fur seals in the subfamily Arctocephalinae. Despite what its name suggests, the Antarctic fur seal is mostly distributed i ...
(''Arctocephalus gazella'') is the main prey. Other prey include penguins and fish including chondrichthyan
Chondrichthyes (; ) is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fishes'', which have skeletons primarily composed of bone tissue. ...
s. Antarctic krill
Antarctic krill (''Euphausia superba'') is a species of krill found in the Antarctic waters of the Southern Ocean. It is a small, swimming crustacean that lives in large schools, called swarms, sometimes reaching densities of 10,000–30,000 ind ...
(''Euphausia superba''), southern elephant seal
The southern elephant seal (''Mirounga leonina'') is one of two species of elephant seals. It is the largest member of the clade Pinnipedia and the order Carnivora, as well as the largest extant marine mammal that is not a cetacean. It gets it ...
(''Mirounga leonina'') pups and seabirds other than penguins have also been taken as prey.
When hunting penguins, the leopard seal patrols the waters near the edges of the ice, almost completely submerged, waiting for the birds to enter the ocean. It kills the swimming bird by grabbing the feet, then shaking the penguin vigorously and beating its body against the surface of the water repeatedly until the penguin is dead. Previous reports stating the leopard seal skins its prey before feeding have been found to be incorrect. Lacking the teeth necessary to slice its prey into manageable pieces, it flails its prey from side to side tearing and ripping it into smaller pieces. Krill meanwhile, is eaten by suction, and strained through the seal's teeth, allowing leopard seals to switch to different feeding styles. Such generalization and adaptations may be responsible for the seal's success in the challenging Antarctic ecosystem.
Physiology and research
Leopard seals' heads and front flippers are extremely large in comparison to other phocids. Their large front flippers are used to steer themselves through the water column making them extremely agile while hunting. They use their front flippers similarly to sea lions (otariids) and leopard seal females are larger than males. They are covered in a thick layer of blubber that helps to keep them warm while in the cold temperatures of the Antarctic. This layer of blubber also helps to streamline their body making them more hydrodynamic. This is essential when hunting small prey items such as penguins because speed is necessary. Scientists take blubber thickness, girth, weight, and length measurements of leopard seals to learn about their average weight, health, and population as a whole. These measurements are then used to calculate their energetics which is the amount of energy and food it takes for them to survive as a species. They also have incredible diving capabilities. This information can be obtained by scientists by attaching transmitters to the seals after they are tranquilized on the ice. These devices are called satellite-linked time depth recorders (SLDRs) and time-depth recorders (TDRs). Scientists attach this device usually to the head of the animal and it records depth, bottom time, total dive time, date and time, surface time, haul out time, pitch and roll, and total number of dives. This information is sent to a satellite where scientists from anywhere in the world can collect the data. This is how we are currently learning so much about leopard seals diet and foraging habits. With this information we are able to calculate and better understand their diving physiology. They are primarily shallow divers but they do dive deeper than 80 meters in search for food. They are able to complete these dives by collapsing their lungs and re-inflating them at the surface. This is possible by increasing surfactant which coats the alveoli in the lungs for re-inflation. They also have a reinforced trachea to prevent collapse at great depth pressures.
Relationships with humans
Leopard seals are large predators presenting a potential risk to humans. However, attacks on humans are rare. Most human perceptions of leopard seals are shaped by historic encounters between humans and leopard seals that occurred during the early days of Antarctic exploration.
Negative interactions with humans
Examples of aggressive behaviour, stalking and attacks are rare, but have been documented.[ Notable incidents include:
* A large leopard seal attacked ]Thomas Orde-Lees
Major (United Kingdom), Major Thomas Hans Orde-Lees, Order of the British Empire, OBE, Air Force Cross (United Kingdom), AFC (23 May 1877 – 1 December 1958) was a member of Sir Ernest Shackleton's Imperial Trans-Antarctic Expedition of 1914&n ...
(1877–1958), a member of Sir Ernest Shackleton
Sir Ernest Henry Shackleton (15 February 1874 – 5 January 1922) was an Anglo-Irish Antarctic explorer who led three British expeditions to the Antarctic. He was one of the principal figures of the period known as the Heroic Age of ...
's Imperial Trans-Antarctic Expedition
The Imperial Trans-Antarctic Expedition of 1914–1917 is considered to be the last major expedition of the Heroic Age of Antarctic Exploration. Conceived by Sir Ernest Shackleton, the expedition was an attempt to make the first land crossing ...
of 1914–1917, when the expedition was camping on the sea ice. The "sea leopard", about long and , chased Orde-Lees on the ice. He was saved only when another member of the expedition, Frank Wild
John Robert Francis Wild (18 April 1873 – 19 August 1939), known as Frank Wild, was an English sailor and explorer. He participated in five expeditions to Antarctica during the Heroic Age of Antarctic Exploration, for which he was awar ...
, shot the animal.
* In 1985, Canadian-British explorer Gareth Wood was bitten twice on the leg when a leopard seal tried to drag him off the ice and into the sea. His companions managed to save him by repeatedly kicking the animal in the head with the spiked crampon
A crampon is a traction device that is attached to footwear to improve mobility on snow and ice during ice climbing. Besides ice climbing, crampons are also used for secure travel on snow and ice, such as crossing glaciers, snowfields and ice ...
s on their boots.[Carrington, Damian (2003-07-24)]
Inquiry into fatal leopard seal attack begins
NewScientist.com. Retrieved on 2013-02-24.[
*On 26 September 2021, near the dive site Spaniard Rock at ]Simon's Town
Simon's Town ( af, Simonstad), sometimes spelled Simonstown, is a town in the Western Cape, South Africa and is home to Naval Base Simon's Town, the South African Navy's largest base. It is located on the shores of False Bay, on the eastern ...
, South Africa, three spear-fisherman encountered a leopard seal while spearing approximately 400 m offshore. The seal attacked them and, while they were swimming back to shore, disarmed them of their flippers and spearguns and kept harassing the men over the course of half an hour, inflicting multiple bite and puncture wounds.
Fatal interactions
In 2003, biologist Kirsty Brown of the British Antarctic Survey was killed by a leopard seal while snorkeling
Snorkeling ( British and Commonwealth English spelling: snorkelling) is the practice of swimming on or through a body of water while equipped with a diving mask, a shaped breathing tube called a snorkel, and usually swimfins. In cooler waters, a ...
in Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean, it contains the geographic South Pole. Antarctica is the fifth-largest contine ...
. This was the first recorded human fatality from a leopard seal. Brown was part of a team of four researchers taking part in an underwater survey at South Cove near the U.K.'s Rothera Research Station
The Rothera Research Station is a British Antarctic Survey (BAS) base on the Antarctic Peninsula, located at Rothera Point, Adelaide Island. Rothera also serves as the capital of the British Antarctic Territory, a British Overseas Territ ...
. Brown and another researcher, Richard Burt, were snorkeling in the water. Burt was snorkeling 15 meters away when the team heard a scream and saw Brown disappear into the water. She was quickly rescued by her team but they were unable to resuscitate her. It was later revealed that the seal had held her underwater for six minutes at a depth of up to 70 meter
The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pref ...
s. She suffered a total of 45 separate injuries most of which were concentrated around her head and neck. As she was snorkeling at the time she may have seen the seal approaching her.
In a report read at the inquiry into Brown's death, Professor Ian Boyd from St. Andrews University stated that the seal may have mistaken her for a fur seal or may have been frightened by her presence and attacked in defense. Professor Boyd claimed that leopard seal attacks on humans were extremely rare but warned that they may potentially become more common due to increased human presence in Antarctica. The coroner recorded a verdict of an accidental death caused by drowning due to a leopard seal attack.[Gyford, Sue (2003-11-14)]
ecophotoexplorers.com. Retrieved on 2019-08-20
Interactions with human property
Leopard seals have shown a predilection for attacking the black, torpedo-shaped Pontoon (boat), pontoons of rigid inflatable boat
A rigid inflatable boat (RIB), also rigid-hull inflatable boat or rigid-hulled inflatable boat (RHIB), is a lightweight but high-performance and high-capacity boat constructed with a rigid hull bottom joined to side-forming air tubes that are i ...
s, leading researchers to equip their craft with special protective guards to prevent them from being punctured.[
]
Positive interactions with humans
Paul Nicklen
Paul Nicklen (born July 21, 1968) is an acclaimed Canadian photographer, film-maker, author and marine biologist.
Early life
Paul Nicklen was born on July 21, 1968, in Tisdale, Saskatchewan, Canada. By the mid-seventies, Paul's family - made ...
, a ''National Geographic'' magazine photographer, captured pictures of a leopard seal bringing live, injured, and then dead penguins to him, possibly in an attempt to teach the photographer how to hunt.
Conservation
From a conservation standpoint, the only known predators of the leopard seals are killer whales and sharks. Because of their limited subpolar distribution in the Antarctic, they may be at risk as polar ice caps diminish with global warming. In the wild, leopard seals can live up to 26 years old. Leopard seal hunting is regulated by the Antarctic Treaty and the Convention for the Conservation of Antarctic Seals (CCAS).
Notes and references
General references
*
* Heacox, Kim. (2006)
Deadly Beauty.
''National Geographic'', November 2006
* Saundry, Peter. (2010
Leopard Seal.
''Encyclopedia of Earth''. Topic ed. C. Michael Hogan, editor-in-chief Cutler Cleveland, NCSE, Washington DC
External links
* ttps://www.youtube.com/watch?v=Zxa6P73Awcg "Face-off with a deadly predator"(video); National Geographic photo assignment
Voices in the Sea – the Leopard Seal
(audio)
{{Authority control
Lobodontins
Pinnipeds of Antarctica
Pinnipeds of South America
Pinnipeds of Australia
Mammals of Chile
Mammals of South Australia
Carnivorans of South America
Fauna of Heard Island and McDonald Islands
Least concern biota of Oceania
Least concern biota of South America
Mammals described in 1820
Extant Zanclean first appearances
Pliocene mammals of South America
Pliocene pinnipeds
Taxa named by Henri Marie Ducrotay de Blainville