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Download as PDF; Printable version ... move to sidebar hide. Help. Animals of the Ordovician period Paleontology portal ... Pages in category "Ordovician animals"
Download as PDF; Printable version; ... Life on Earth during the Ordovician period. ... Ordovician animals (7 C, 16 P) B.
The Great Ordovician Biodiversification Event (GOBE) was an evolutionary radiation of animal life throughout [1] the Ordovician period, 40 million years after the Cambrian explosion, [2] whereby the distinctive Cambrian fauna fizzled out to be replaced with a Paleozoic fauna rich in suspension feeder and pelagic animals.
Graptolite fossils were later referred to a variety of groups, including other branching colonial animals such as bryozoans ("moss animals") and hydrozoans. The term Graptolithina was established by Bronn in 1849, who considered them to represent orthoconic cephalopods.
By the Devonian Period, the colonization of the land by plants was well underway. The bacterial and algal mats were joined early in the period by primitive plants that created the first recognizable soils and harbored some arthropods like mites, scorpions and myriapods. Early Devonian plants did not have roots or leaves like the plants most ...
Early depictions of this animal show it emerging onto land, however paleontologists now widely agree that it was a strictly aquatic animal. [62] The genus Eusthenopteron is known from several species that lived during the Late Devonian period, about 385 Ma.
The discovery dates to the Ordovician Period, a 41.6-million-year era during which the oceans were dominated by the ancestors of today’s sea urchins and starfish, and a variety of species known ...
The Ordovician–Silurian extinction events may have been caused by an ice age that occurred at the end of the Ordovician Period, due to the expansion of the first terrestrial plants, [54] as the end of the Late Ordovician was one of the coldest times in the last 600 million years of Earth's history.