Bioacoustics of Mallinella merimbunenis

Diagnosis. Males of M. merimbunenis sp. nov. can be easily recognised by the dark, elevated, circular tubercle on the proximal dorsal surface of femora I–III ( Fig. 4 ), in combination with posterior metatarsi distinctly longer than femora, as well as their distinctive leg colour pattern (see species description below). These tubercles are stridulatory organs ( Dankittipakul et al . 2012 ; Jocqué 2005 ) of which three pairs are present also in male specimens of M. annulipes (Thorell, 1892) , found in Singapore , peninsular Malaysia , and in the province of Riau Islands of Indonesia . However, they are absent in the closely related M. albomaculata ( Bosmans & Hillyard, 1990 ) (also from Borneo, type deposited at NHML, examined). Males of this new species are separated from those of the closely related M. albomaculata by the smaller RTA ( Fig. 17 ) and the larger distal extremities on both rami of the embolus ( Figs 15–16 ). Females resemble those of M. albomaculata ( Fig. 7 ) in possessing the deeply invaginated anterior margin of the epigyne and the distinctly broad lateral lobes. They can be distinguished by the longer median groove reaching the posterior margin of the epigynal septum ( Fig. 8 ) and by the different configuration of the internal genitalia ( Figs 18–21 ).