The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Trilobita, trilobite, fossil, extinct, prehistoric creature, index fossil, Palaeozoic Era, Palaeozoic, Cambrian period, sea creature, chitin layer, chitin, armour, arachnids, cancer, animal, arthropod, arthropods, biology
This animation demonstrates the anatomy of spiders through the example of a common European species.
สัตว์กินเนื้อขนาดใหญ่ ซึ่งเป็นที่รู้จักกันดี นั่นคือ ไดโนเสาร์
An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.
Long-necked herbivorous dinosaur with a robust body.
The archaeopteryx shows characteristics of both birds and reptiles. It is probably the ancestor of birds.
This animation presents some animals and plants that lived between the Devonian and Permian periods (358–299 million years ago).
Deinonychus antirrhopus, the 'terrible claw', was a carnivorous dromaeosaurid dinosaur.
The last Ice Age ended about 13 thousand years ago.
The ‘upright man’ used tools and could set fire.
Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.
A prehistoric amphibian and an early representative of the Tetrapods, which became extinct 360 million years ago.
One of the best known species of spiders, often kept as pets. Its bite is not fatal for humans.
Eurypterids are an extinct group of Palaeozoic aquatic arthropods.
This 3D scene presents the flora and fauna of the last period of the Palaeozoic Era.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
A type of prehistoric reptile having bony plates on its back, which aided thermoregulation.
A transitional form between fish and tetrapods, or four-limbed vertebrates.
A type of herbivorous dinosaur easily recognisable by its large frill and three horns which lived in the Cretaceous period.
Living fossil, important stage in the evolution of tetrapods.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
The Earth's continents have been in constant motion during the history of the planet.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
One of the most common types of flatworms.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.