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Three new and a known species of Aporcelaimus are reported and described from Alaska, all belonging to the smaller representatives (3 to 5 mm) of the genus. A. boreus sp. nov. resembles A. superbus (de Man, 1880), but it differs by longer spear and spicula, and number and arrangement of male supplements. A. brzeskii sp. nov. differs from species having some of the supplements within the range of spicula...
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