Ammonites
An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.
Biologija
Raktiniai žodžiai
Amonitai, Priešistorinis tvarinys, Iškasena, Kreidos periodas, Juros periodas, Devono laikotarpis, Siphuncle, eksoskeletas, Galvos smegenys, moliuskai, Galvos moliuskai, gyvūnas, biologija
Susiję elementai
Freshwater pearl mussel
A species of mollusc widespread in freshwaters.
Vynuoginė sraigė
Plačiai paplitusi sraigių rūšis, dar naudojama maistui.
"Homo erectus"
„Stačiasis žmogus“ jau gamino darbo įrankius ir naudojo ugnį.
Apatozauras
Ilgakaklis žolėdis dinozauras turintis tvirtą kūną.
Apledėjimas
Paskutinis apledėjimo periodas baigėsi prieš 13 tūkstančių metų.
Archaeopteryx
The archaeopteryx shows characteristics of both birds and reptiles. It is probably the ancestor of birds.
Carboniferous flora and fauna
This animation presents some animals and plants that lived between the Devonian and Permian periods (358–299 million years ago).
Deinonychus
Deinonychus antirrhopus, the 'terrible claw', was a carnivorous dromaeosaurid dinosaur.
Ichthyostega
A prehistoric amphibian and an early representative of the Tetrapods, which became extinct 360 million years ago.
Monsters of the Palaeozoic: sea scorpions
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
Pearls
Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.
Permian flora and fauna
This 3D scene presents the flora and fauna of the last period of the Palaeozoic Era.
Pteranodon longiceps
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
Stegosaurus
A type of prehistoric reptile having bony plates on its back, which aided thermoregulation.
Tiktaalik
A transitional form between fish and tetrapods, or four-limbed vertebrates.
Tyrannosaurus rex ‘tyrant lizard’
Large carnivores, perhaps the best known of dinosaurs.
Triceratops
A type of herbivorous dinosaur easily recognisable by its large frill and three horns which lived in the Cretaceous period.
Trilobites
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Woolly mammoth
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
Žemynų padėties kaita per visą Žemės istoriją
Žemynai dreifavo per visą Žemės istoriją. Šis procesas tęsiasi ir šiuo metu.
Diversity of light-detecting organs
Several analogous types of eyes have developed independently through convergent evolution.
Jellyfish
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
Planaria gonocephala
One of the most common types of flatworms.
Sponge
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.