High Quality Content by WIKIPEDIA articles! The Order Trigonotarbida is an extinct group of arachnids whose fossil record extends from the late Silurian to the early Permian (c.?419 to 290 million years ago). These animals are known from several localities in Europe and North America, as well as a single record from Argentina. Trigonotarbids can be envisaged as spider-like arachnids, but without silk-producing spinnerets. They ranged in size from a few millimetres to a few centimetres in body length and had a segmented abdomen, with the tergites across the back of the animal's abdomen characteristically divided into three or five separate plates. Probably living as predators on other arthropods, some later trigonotarbid species were quite heavily armoured and protected themselves with spines and tubercles. About seventy species are currently known, with most fossils originating from the Carboniferous Coal Measures. Данное издание представляет собой компиляцию сведений, находящихся в...

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