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In page Trigonotarbida:

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Trigonotarbids superficially resemble spiders, but can be easily recognised by having tergites on the dorsal side of the abdomen divided into median and lateral plates.[1] This character is shared with ricinuleids (Ricinulei) (see also Ricinulei#Relationships). As in other arachnids, the body is divided into a prosoma (or cephalothorax) and opisthosoma (or abdomen). Body length ranges from a couple of millimetres up to about 5 cm (2.0 in).[2]