Rare Illaenus chudleighensis Russian Trilobite

Name: Illaenus chudleighensis Russian trilobites

Age: Middle Ordovician

Size (25.4 mm = 1 inch): 60 mm long by 38 mm wide on a 73 by 54 mm matrix

Location: Asery Horizon deposits of the Wolchow River region near Saint Petersburg, Russia

Illaenus chudleighensisDescription: This is an example of the unusual trilobite Illaenus chudleighensis. This is one of the 50-odd members of the genus, and known for the high profile of the cephalon which is thought to have aided the trilobite in ploughing through the substrate in search of a meal. It is also one of the less common of the genus, with this one in a relatively prone position; most Illaenus are seen in an enrolled position, presumably a result of post mortem contraction of muscles in the massive cephalon.

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