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Benthic harpacticoids were collected for the first time at Lake Tahoe, California-Nevada, United States. Two species were identified as members of the genus    Attheyella    Brady, 1880. The genus    Attheyella    comprises about 150 species within six subgenera, but only twelve species have previously been reported from North American freshwater habitats. The two new species of    Attheyella    described here have a 3-segmented endopod on P1 and 2-segmented P2–P4 endopods, the distal segment of exopod of P2–P4 has three outer spines, and the P5 has five setae on the exopod and six setae on the baseoendopod.   Attheyella  ( Attheyella )  tahoensis   sp. n.  most closely resembles   A.  ( A. )  idahoensis   (Marsh, 1903) from Idaho, Montana, and Alaska (United States) and   A.  ( A. )  namkungi   Kim, Soh &amp; Lee, 2005 from Gosu Cave in South Korea. They differ mainly by the number of setae on the distal endopodal segment of P2–P4. In addition, intraspecific variation has been observed on the caudal rami.   Attheyella  ( Neomrazekiella )  tessiae   sp. n.  is characterized by the extension of P5 baseoendopod, 2-segmented endopod of female P2–P3, and naked third seta of male P5 exopod. The two new species are likely endemic to Lake Tahoe, an isolated alpine lake within the Great Basin watershed in the western United States.

First record of harpacticoid copepods from Lake Tahoe, United States: two new species of Attheyella ( Harpacticoida , Canthocamptidae )