Insects constitute the most abundant terrestrial invertebrates found in the Jurassic fossil record. Groups include the odonates (damselflies and dragonflies), coleopterans (beetles), dipterans (flies), and hymenopterans (bees, ants, and wasps). The discovery of Jurassic bees—which today are dependent upon flowering plants (angiosperms)—suggests either the early presence of angiosperms or that bees were originally adapted to other strategies. Snails, bivalves, and ostracods are preserved in freshwater deposits.
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