Gigantocharinus

Период: Девон

Gigantocharinus szatmaryi
(trigonotarbid arachnid)

A new genus and species of trigonotarbid arachnid, Gigantocharinus szatmaryi, was recovered from debris at the bottom of the Red Hill exposure. The gray-green siltstone in which this impression fossil is embedded suggest that it came either from the Floodplain Pond facies or a similar depositional environment. Gigantocharinus measures 7 mm in length and is tennatively assigned to the trigonotarbid family Paleocharinidae.

Trigonotarbids are an extinct group of arachnid arthropods whose record extends from the Silurian to the Lower Permian and are known from several localities in Europe and North America. They superficially resemble spiders. Both have eight legs and a pair of pedipalps (leg-like appendages near the head that are used for sensing, seizing and manipulating prey). They also have two main body parts (cephalothorax and abdomen). However, trigonotarbids lack the silk-producing spinnerets that have apparently been crucial to the spider's evolutionary success. They also have strongly segmented abdomen and don't exhibit the constriction that spiders have between the abdomen and cephalothorax.

Other invertebrates have also been found at Red Hill, including a millipede (Orsadesmus rubecollus), an unknown myriapod, a scorpion fragment and an arthropod trackway.

http://www.devoniantimes.org/who/pages/trigonotarbid.html

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