This study revises the status of knowledge of the spider fauna of the Marquesas Islands in French Polynesia. In particular, the genus Tetragnatha was noticeable for its poor representation in the Marquesas Islands by comparison with the large radiation in the yet more remote Polynesian archipelago of the Hawaiian Islands. Expeditions were conducted to determine whether Tetragnatha was indeed poorly represented in the Marquesas Islands, as the literature would suggest. In addition, specimens were studied from historical collections from this archipelago. The results indicate that the islands do indeed have a number of endemic Tetragnatha, and the genus does appear to have undergone adaptive radiation, although not nearly on the same scale as in the Hawaiian Islands. Results indicate that: (1) in addition to T. marquesiana Berland there are four new species, described here, each of which are endemic to the islands. Tetragnatha marquesiana is widespread in the northern islands, including Nuku Hiva. There are two additional species on Nuku Hiva: T. punua and T. oomua. Two new species are described from the southern islands of Hiva Oa (T. kapua) and Tahuata (T. tahuata). Tetragnatha kapua from Hiva Oa appears to be related to T. marquesiana. (2) Tetragnatha macilenta L. Koch does not occur on these islands. Reports of its widespread distribution through the Pacific can only be substantiated as far as the Society Islands. (3) Tetragnatha nitens (Audouin), which may not be indigenous, occurs in disturbed areas at high elevations in Nuku Hiva. In total, there are six species of Tetragnatha in the Marquesas Islands.
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