Abstract
Juranomia calcibyssata gen. et sp. nov. is a typical anomiidbivalve characterized by a byssal notch and crus supporting the ligament in the lower, right valve and by three interconnected muscle scars in the upper, left valve. The shells are fixed to the substrate by means of a calcified byssus. The species is abundant in marginal marine (brackish) environments of the Lusitanian Basin of Portugal during Kimmeridgian times.
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