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18.12.2015 19:00 - Largest prehistoric animals Vol.1 Vertebrates part2 Birds Ch.4 Penguins
Автор: valentint Категория: Забавление   
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Последна промяна: 03.12.2016 02:23


Penguins (Sphenisciformes)

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1. Pinguinus impennis 2. Waimanu manneringi 3. Pachydyptes ponderosus 4. Icadyptes salasi 5. Inkayacu paracasensis 6. Anthropornis nordenskjoeldi

 

The largest penguin of all time was Palaeeudyptes klekowskii
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Palaeeudyptes klekowskii was a species of the extinctpenguingenus Palaeeudyptes. It was until recently thought to have been approximately the size of its congener Palaeeudyptes antarcticus, which would mean it was somewhat larger than the modern emperor penguin, but a new study shows it was in fact almost twice as tall. It is known from an extensive collection of fossil bones from the Late Eocene (34-37 MYA) of the La Meseta Formation on Seymour Island, Antarctica. P. klekowskii was at first not recognized as a distinct species, and despite the coexistence of two so closely related species of similar size as Palaeeudyptes gunnari and P. klekowskii seeming somewhat improbable, the amount of fossil material suggests that the two species are indeed diagnosably different.


Other largest penguin was Anthropornis nordenskjoeldi of New Zealand and Antarctica.
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It stood 1.7 meters (5 feet 7 inches) in height and was 90 kilograms (200 pounds) in weight. Anthropornis is a genus of giant penguin that lived 37-45 million years ago, during the Late Eocene and the earliest part of the Oligocene.It reached 1.7 m (5 ft 7 in) in height and 90 kg (200 lb) in weight. Fossils of it have been found on Seymour Island off the coast of Antarctica and in New Zealand. By comparison, the largest modern penguin species, the emperor penguin, is just 1.2 m (3 ft 11 in) tall.

The type species, Anthropornis nordenskjoldi, had a bent joint in the wing, probably a carryover from flying ancestors.


Similar in size were the New Zealand giant penguin (Pachydyptes pondeorsus) with a height of 1.4 to 1.6 m (4.6 to 5.2 ft) and weighing around 80 to possibly over 100 kg

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Pachydyptes is an extinct genus of penguin. It contains the single species Pachydyptes ponderosus, the New Zealand giant penguin. This taxon is known from a few bones from Late Eocene (37 to 34 MYA) rocks in the area of Otago.

With a height of 140 to 160 cm (about 5 ft) and weighing around 80 to possibly over 100 kg, it was the second-tallest penguin ever, surpassed only by Anthropornis nordenskjoeldi in height, but probably not in weight.
Pachydyptes was slightly larger than Icadyptes salasi, the best-identified of the giant penguins.

Icadyptes salasi at 1.5 m (4.9 ft) tall.

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The fossilised remains of the penguin, which lived 36 million years ago, were found in the coastal desert of Peru by the team of North Carolina State Universitypalaeontologist Dr. Julia Clarke, assistant professor of marine, earth and atmospheric sciences. Its well-preserved fossil skeleton was found on the southern coast of Peru together with an early Eocene species Perudyptes devriesi (comparable in size to the living King penguin), and the remains of three other previously undescribed penguin species, all of which seem to have preferred the tropics over colder latitudes. Perudyptes devriesi is named after the country, and Thomas DeVries, a Vashon Island High School science teacher who has long worked in Peru.
Icadyptes salasi and Perudyptes devriesi appear to have flourished at warmer latitudes at a time when world temperatures were at their warmest over the past 65 million years. Only a few modern-day penguins, such as the African and Galapagos penguins prefer such a balmy climate.
The discovery of the fossils has caused a re-evaluation of penguin evolution and expansion. Previously, scientists believed that penguins evolved near the poles in Antarctica and New Zealand, and moved closer to the equator around 10 million years ago. Since Icadyptes salasi lived in Peru during a period of great warmth, penguins must have adapted to warm climates around 30 million years earlier than previously believed.

















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Автор: valentint
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