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Diastem , diastem A very small break in a conformable succession of strata, indicated only by a bedding plane, and representing a brief interruption in the dep… spinel , spinel Important group of non-silicate mineral oxides, including the subgroups spinel series, magnetite series, and chromite series. Members of the s… Pit Viper , Crotalidae (pit vipers; order Squamata, suborder Serpentes) A family of venomous snakes which are closely related to true vipers (Viperidae) but whic… Demosponges , Demospongiae (Demospongea; phylum Porifera) A class of sponges which occur in both marine and freshwater environments. They have a leucon body struct… heterodont , heterodont
1. (invertebrate) Applied to a hinge dentition occurring in the Bivalvia, where teeth of differing sizes occur in the hinge plate. The tee… Anglesite , wulfenite Mineral, PbMoO4; sp. gr. 6.5–7.0; hardness 3; tetragonal; orange-yellow, olive-green, or brown; white streak; resinous lustre; crystals usu…
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