Fitxategi:Basilosaurus sp. (fossil whale) (Eocene; Egypt) 2 (32190872332).jpg
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DeskribapenaBasilosaurus sp. (fossil whale) (Eocene; Egypt) 2 (32190872332).jpg |
Basilosaurus sp. - fossil whale skull (cast) from the Eocene of Egypt. (public display, Field Museum of Natural History, Chicago, Illinois, USA) From museum signage: "At the water's edge, whales were making a big move: from land to sea. It's one of evolution's most fascinating stories. Whales are ocean mammals that started out as land mammals. Four-footed predatory mammals hunted in and around the waters of Asia's ancient coastline more than 50 million years ago. Over time, these creatures came to depend more on food from the sea than food on land. As they became adapted for life in the water, feet evolved into flippers, and whales left the shores for good. What's more, fossils tell us these ancient whale ancestors were four-footed mammals with hooves. Feet became flippers in just ten million years. From land-dwelling ancestors, the first whales evolved for life spent partly on land, partly in the sea. With webbed feet, they could swim; with long limbs, they could move about on shore. But food was abundant in the seas. Within ten million years, whales were fully aquatic. Webbed front feet evolved into paddle-like flippers. Hind limbs all but disappeared, as a broad tail fluke evolved for more powerful swimming. Whales today do not have feet, so of course they don't have hooves. So how do we know whales' ancestors had hooves? There are a couple clues. In fossils of some early whales, there are hoof-like claws on the feet. But an even better clue is in the ankles. Fossils show that ankles of early land-dwelling whales share a unique structure with ankles of certain hoofed mammals that live today. The grooves at each end of an early whale's ankle bone are unique to the ankles of a group of hoofed mammals called artiodactyls, which includes camels, pigs, hippos, and antelopes. The grooves prevent side-to-side movement of the ankle - certain hoofed mammals can only move their ankles forward and backward.' This display explores the fossil clues that whales evolved from a hoofed mammal ancestor that walked on land. But fossils are no longer the only clues supporting this theory. DNA provides others. Genetic studies indicate that whales' closest relatives are the group of hoofed mammals called artiodactyls." "[The early whale] Basilosaurus had only tiny hind limbs and a pelvis - no longer needed for weight-bearing - detached from its spine." Classification: Animalia, Chordata, Vertebrata, Mammalia, Artiodactyla, Cetacea, Archaeoceti, Basilosauridae See info. at: <a href="https://en.wikipedia.org/wiki/Basilosaurus" rel="nofollow">en.wikipedia.org/wiki/Basilosaurus</a> and <a href="https://en.wikipedia.org/wiki/Basilosauridae" rel="nofollow">en.wikipedia.org/wiki/Basilosauridae</a> |
Data | |
Jatorria | Basilosaurus sp. (fossil whale) (Eocene; Egypt) 2 |
Egilea | James St. John |
Lizentzia
- Askea zara:
- partekatzeko – lana kopiatzeko, banatzeko eta bidaltzeko
- birnahasteko – lana moldatzeko
- Ondorengo baldintzen pean:
- eskuduntza – Egiletza behar bezala aitortu behar duzu, lizentzia ikusteko esteka gehitu, eta ea aldaketak egin diren aipatu. Era egokian egin behar duzu hori guztia, baina inola ere ez egileak zure lana edo zure erabilera babesten duela irudikatuz.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32190872332. It was reviewed on 2019ko abenduaren 6a by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2019ko abenduaren 6a
Fitxategi honetan agertzen diren itemak
honako hau irudikatzen du
some value
captured with ingelesa
Nikon D70s ingelesa
10 ekaina 2011
exposure time ingelesa
0.01666666666666666666 segundo
f-number ingelesa
4,5
36 milimetro
ISO speed ingelesa
500
MIME type ingelesa
image/jpeg
checksum ingelesa
dcde3653960fa7be50395c214f6ed9fd81e34884
data size ingelesa
4.160.910 Byte
1.564 pixel
2.891 pixel
Fitxategiaren historia
Data/orduan klik egin fitxategiak orduan zuen itxura ikusteko.
Data/Ordua | Iruditxoa | Neurriak | Erabiltzailea | Iruzkina | |
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oraingoa | 04:03, 6 abendua 2019 | 2.891 × 1.564 (3,97 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
Irudira dakarten loturak
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Metadatuak
Fitxategi honek informazio gehigarri dauka, ziurrenik kamera digital edo eskanerrak egiterako momentuan gehitutakoa. Hori dela-eta, jatorrizko fitxategi hori aldatu egin bada, baliteke xehetasun batzuek errealitatearekin bat ez egitea.
Kameraren fabrikatzailea | NIKON CORPORATION |
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Kamera mota | NIKON D70s |
Esposizio denbora | 1/60 s (0,016666666666667) |
F Zenbakia | f/4,5 |
Datuen sorreraren data eta ordua | 13:42, 10 ekaina 2011 |
Lentearen fokatze luzera | 36 mm |
Orientazioa | Arrunta |
Bereizmen horizontala | 300 dpi |
Bereizmen bertikala | 300 dpi |
Erabilitako softwarea | Adobe Photoshop Elements 13.0 (Macintosh) |
Fitxategi aldaketaren data eta ordua | 02:46, 16 urtarrila 2017 |
Y eta Cren kokatzea | Zentratua |
Esposizio Programa | Definitu gabe |
ISO abiadura | 500 |
Exif bertsioa | 2.21 |
Digitalizazioaren data eta ordua | 13:42, 10 ekaina 2011 |
Osagai bakoitzaren esanahia |
|
APEX argazkiaren itxiera-abiadura | 5,9068905902692 |
Irekiera | 4,3398500267809 |
Esposizio biasa | 0 |
Gehienezko landa irekiera | 4,2086733504313 APEX (f/4,3) |
Distantzia-neurtze modua | Eredua |
Argiaren jatorria | Ezezaguna |
Flash | Flasharekin, estrobo itzulera argia detektatu da, auto modua |
DataDenbora azpisegunduak | 20 |
DataDenboraOrijinala azpisegunduak | 20 |
DataDenboraDigitalizatu azpisekunduak | 20 |
Gaitutako Flashpix bertsioa | 1 |
Kolore tartea | sRGB |
Sensorearen metodoa | Txip bakarreko kolorezko eremu sentsorea |
Fitxategiaren jatorria | Argazki kamera digitala |
Eskena mota | Zuzenean argazkia atera zaion irudi bat |
Irudien prozesamendu pertsonalizatua | Prozesu arrunta |
Esposaketa mota | Esposizio automatikoa |
Txurien oreka | Zurien balantze automatikoa |
Zoom digitalaren eskala | 1 |
35 mm-ko filmerako foku luzera | 54 mm |
Eskena hartze mota | Arrunta |
Eskena kontrola | Ezer |
Kontrastea | Arrunta |
Asetasuna | Arrunta |
Fokatzea | Arrunta |
Subjektuaren distantzia balio-eremua | Ezezaguna |
Erabilitako lentea | 18.0-200.0 mm f/3.5-5.6 |
Kameraren serie-zenbakia | 200638ad |
Datuaren metadata azken aldiz aldatu da | 21:46, 15 urtarrila 2017 |
Jatorrizko dokumentuaren ID bakarra | 555EA5F66B2C4A56D1AA6835E1DC65C0 |