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The New Zealand alpine cave wētā genus Pharmacus was first described by Pictet & de Saussure (1893) as a monotypic taxon. Three species were added to the genus by Richards in 1972. Here we clarify the status and appearance of all known species of Pharmacus. Based on morphology and mtDNA sequences we determine that the species Pharmacus brewsterensis Richards, 1972 is better placed within the genus Notoplectron Richards, 1964. We also resolve the species Isoplectron cochleatum Karny, 1935 and show that it belongs to the genus Pharmacus. Additionally, we describe six new species and three new subspecies from the southern regions of South Island, New Zealand. We provide key traits and known distributions for all known species and subspecies in this alpine genus. New combinations: Pharmacus brewsterensis Richards, 1972 becomes Notoplectron brewsterense (Richards, 1972) comb. nov.; Isoplectron cochleatum Karny, 1935 becomes Pharmacus cochleatus (Karny, 1935) comb. nov. New species and subspecies: Pharmacus cochleatus rawhiti subsp. nov., Pharmacus cochleatus fiordensis subsp. nov., Pharmacus cochleatus nauclerus subsp. nov., Pharmacus concinnus sp. nov., Pharmacus cristatus sp. nov., Pharmacus notabilis sp. nov., Pharmacus perfidus sp. nov., Pharmacus senex sp. nov. and Pharmacus vallestris sp. nov. New synonyms: Pharmacus dumbletoni Richards, 1972 = Pharmacus montanus Pictet & de Saussure, 1893 syn. nov.; Pharmacus chapmanae Richards, 1972 = Pharmacus cochleatus (Karny, 1935) syn. nov.
The genus Pleioplectron was first described by Hutton (1896) and included six New Zealand species. This genus has since had three species moved, one each to the genera Pachyrhamma Brunner von Wattenwyl, 1888, Miotopus Hutton, 1898 and Novoplectron Richards, 1958. Here we clarify the status and appearance of Pleioplectron simplex Hutton, 1896 (incl. P. pectinatum Hutton, 1896 syn. nov.) and P. hudsoni Hutton, 1896, as well as P. thomsoni (Chopard, 1923) comb. nov., which is transferred from the genus Weta Chopard, 1923. The genus Weta is newly synonymised with Pleioplectron. We also describe seven new species of Pleioplectron from South Island, New Zealand: P. auratum sp. nov., P. caudatum sp. nov, P. crystallae sp. nov., P. flavicorne sp. nov., P. gubernator sp. nov., P. rodmorrisi sp. nov and P. triquetrum sp. nov. We base these descriptions on morphology using fresh specimens of both male and female adults, and provide support for each with DNA sequence variation (mtDNA, partial COI).
Comparison of morphological and genetic data from New Zealand forest cave wētā suggests we should recognise the genus Miotopus proposed by Hutton (1898). A new species within this genus is described (Miotopus richardsi sp. nov.). Both Miotopus diversus (Hutton, 1898) and Miotopus richardsi sp. nov. are common in native forests and widespread in New Zealand. Here we provide their known distributions and key traits.
