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The stygobiotic copepod crustacean Pseudectinosoma reductum Galassi & De Laurentiis, 1997. It was discovered in the Presciano spring system (Gran Sasso aquifer) and after recorded also from the Cavuto spring (Montagna Grande aquifer). This species is a “living fossil” of ancient marine origin, with a relict distribution and a very isolated phylogenetic position
