Redlichiida is an order within the major extinct arthropod class Trilobita. The Redlichids are one of  the four older classes of trilobites that originated in the Lower Cambrian.

 Redlichid trilobites are the first arthropods to appear in the fossil record. The earliest known trilobite seems to be the genus Fallotaspis, which is a Redlichid. They are common fossils in Lower Cambrian faunas worldwide. They die out before the end of the Middle Cambrian. The two major Lagerstätten, at which Redlichids are found, are the Emu Bay shales of Southern Australia and the Maotianshan shales near Chengjiang in China.

 Redlichids look primitive. They typically have a large, semicircular cephalon and a highly-segmented thorax that tapers back to a small pygidium. Unlike many other trilobite orders, the Redlichids were probably not capable of defensive enrollment. The Redlichids generally have prominent, long, crescent-shaped eyes. They are often quite spiny with some or all of the following: genal, glabular, tail, segment spines. One Redlichid family, the Olenellids, typically have long spines on the third thoracic segment.

 The appendages have been preserved in a few specimens. They follow typical trilobite patterns in terms of the number, placement, and types of legs, antennae, gills, etc.

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Tags: Вымершие членистоногие, Кембрий

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