Trilobite

Redlichiida, such as this Paradoxides, may represent the ancestral trilobites.

Walliserops trifurcatus, from Djebel Oufaten, Morocco

Trilobites (/ˈtraɪləˌbaɪt, ˈtrɪ-, -loʊ-/; meaning "three lobes") are a fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders except the Proetids died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years.

单词	Pleural lobe
释义	Pleural lobe 英语百科 Trilobite Trilobites (/ˈtraɪləˌbaɪt, ˈtrɪ-, -loʊ-/; meaning "three lobes") are a fossil group of extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (521 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, all trilobite orders except the Proetids died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years.
随便看	Oerstedite Oersted magnet oerstedmeter oerstedmetre oerstedmiter oersted, Oe Oertel Oertel regimen oertel treatment oerter oertlings torsion denier balance oertz rudder oeruginous OERY Oerzen OES. oesch Oeschebüttel Oesclim OEsel Oeselgem Oesipos Oesling Oeslroperos oesogaster

Pleural lobe

Trilobite