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Exactly why the trilobites became extinct is not clear; with repeated extinction events (often followed by apparent recovery) throughout the trilobite fossil record, a combination of causes is likely. After the extinction event at the end of the Devonian period, what trilobite diversity remained was bottlenecked into the order Proetida.
Asaphellus is an extinct genus of trilobites reported from the Ordovician. It is seen in Argentina, Bolivia, Mexico, America, Algeria, Iran, Spain, Portugal, France, Great Britain, Czech Republic, Norway, Sweden and China. [1] [2] [3]
Homalonotus is an extinct genus of trilobites in the order Phacopida. It contains several species, including H. armatus and H. roemeri. It is closely related to other trilobites such as Arduennella and Dipleura. [2] [circular reference].
Trilobites are some of the only animals in the fossil record that can be found with eyes, this is due to the fact that the lenses in their eyes were covered with calcite. In fact, it is believed that trilobites bore the first eyes. Trilobites were extremely successful, occupying many ecological niches: such as scavengers and filter feeders.
As there is a wide diversity of adult morphology in the aforementioned trilobite families, this tiny planktonic larval phase that they share may be the link to their extinction. Most trilobites with this life history strategy lived in warm, low latitude waters, in which planktonic, non-adult like larvae may be ideal at surviving in.
Ditomopyge is an extinct genus of trilobite belonging to the family Proetidae. [1] It was extant during the Carboniferous and Permian [ 2 ] [ 3 ] and is widely distributed, with fossils found in Europe, [ 4 ] [ 5 ] southwest Asia, [ 6 ] southeast Asia, [ 3 ] Australia, [ 7 ] North America, [ 8 ] [ 9 ] [ 2 ] [ 10 ] and South America.
Nevadella is an extinct genus of trilobites, fossil marine arthropods, with species of average size (about 5 centimetres or 2.0 inches long). It lived during the late Atdabanian stage, which lasted from 530 to 524 million years ago during the early part of the Cambrian Period .
Calymene Brongniart, 1822, is a genus of trilobites in the order Phacopida, suborder Calymenina, that are found throughout North America, North Africa, and Europe in primarily Silurian outcrops. [2] Calymene is closely related to Flexicalymene, and both genera are frequently found enrolled. [3] Calymene trilobites are small, typically 2 cm in ...