Caridina clandestina, new species, an unusual new freshwater shrimp (Crustacea: Decapoda: Atyidae) from the remote high elevation Napu Valley of Sulawesi, Indonesia

Caridina clandestina, new species, a riverine, endemic freshwater shrimp is described from the upper reaches of Lariang River watershed at Napu Valley in Central Sulawesi, Indonesia. The species is distinct in showing dimorphic chelae on the first and second pereiopods related to different feeding strategies (scraping vs. filter feeding) but related to neither sex nor age. Morphologically, this new species is similar to C. longidigita Cai & Wowor, 2007 and both morphologically and molecularly closely related to the C. pareparensis species group. However, the unusual dimorphic trophic morphology, the morphology of male sexual appendages, and genetic results (mtDNA) place the new species within the western Sulawesi clade of Caridina and distinguish the new species from all known congeners.