Redescription of two Bornean species of the genus Myrmarachne (Araneae: Salticidae)

摘要

Myrmarachne borneensis G. Peckham & E. Peckham, 1907 and M. shelfordii G. Peckham & E. Peckham, 1907 are redescribed here based on type specimens. The lectotype of M. shelfordii is designated. The genus Myrmarachne is a unique group of the family Salticidae, attracting great interests of scientists because of their ant-like morphology and behaviour. Around 80 species are recorded from Southeast Asia, and ten species from Borneo (Murphy & Murphy 2000; Proszyhski 2010). Myrmarachne borneensis and M. shelfordii were described by G. Peckham & E. Peckham (1907) solely based on the male from Sarawak, Borneo. However, the drawings of several taxonomic characters are lacking from their original descriptions. Consequently, it is difficult to identify specimens as these two species without direct comparison with their type specimens. In the present paper, M. borneensis and M. shelfordii are redescribed based on their type specimens to present taxonomically important characteristics as well as some of these two species. Although the female is not known for both the species, the redescription of the male would be useful in identifying species, thus contributing to the clarification of Myrmarachne fauna in Borneo.