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Elrathia marjumi Robison, 1964

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This Elrathia marjumi from the Pierson Cove Formation does show the typical hook of the pygidal rim. But this specimen do have 13 thorax segments like a Elrathia kingi. The classical Elrathia marjumi has 12 thorax segments. The genus Elratia seems to be quite variable in the number body segments. It seems a other time that systematic dos not fit in numeric statistics. Pierson Cove Formation is mostly equal to Wheeler and mostly Marjum Formations and represent a shallower environment.

	Location:	Drum mountains, Millard Co., Utah, USA
	Size trilobite:	about 20 mm long
	Age:	Middle Cambriun, Pierson Cove Fm. (about 518 Mill. Y.)

Product no.: 4649