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The monotypic genus    Cryptomaster    Briggs, 1969 was described based on individuals from a single locality in southwestern Oregon. The described species    C.   leviathan    Briggs, 1969 was named for its large body size compared to most travunioid   Laniatores  . However, as the generic name suggests,    Cryptomaster    are notoriously difficult to find, and few subsequent collections have been recorded for this genus. Here, we increase sampling of    Cryptomaster    to 15 localities, extending their known range from the Coast Range northeast to the western Cascade Mountains of southern Oregon. Phylogenetic analyses of mitochondrial and nuclear DNA sequence data reveal deep phylogenetic breaks consistent with independently evolving lineages. We use discovery and validation species delimitation approaches to generate and test species hypotheses, including a coalescent species delimitation method to test multi-species hypotheses. For delimited species, we use light microscopy and SEM to discover diagnostic morphological characters. Although    Cryptomaster    has a small geographic distribution, this taxon is consistent with other short-range endemics in having deep phylogenetic breaks indicative of species level divergences. Herein we describe    Cryptomaster   behemoth    sp. n. , and provide morphological diagnostic characters for identifying    C.   leviathan    and    C.   behemoth   .

A new monster from southwest Oregon forests: Cryptomaster behemoth sp. n. ( Opiliones , Laniatores , Travunioidea )