Anisops barbatus Brooks, 1951

Nieser, Nico, 2004, Guide To Aquatic Heteroptera Of Singapore And Peninsular Malaysia Iii. Pleidae And Notonectidae, Raffles Bulletin of Zoology 52 (1), pp. 79-96 : 84-85

Anisops barbatus Brooks, 1951

Anisops barbata Brooks, 1951 ; Lansbury, 1964; Fernando & Cheng, 1974; Fernando & Leong, 1976.

Diagnosis. – The largest species occurring in the Malay Peninsula, although some of the largest females of A. occipitalis overlap in size with small females of A. barbatus . Length, male 8.5-9.3, female 8.0-9.1; greatest width, male 2.7-3.0, female 2.8-3.1. Synthlipsis at least two thirds the anterior width of vertex; width of head 0.8-0.9 times the humeral width of pronotum.

Male. In dorsal view, anterior margin of head truncate; width of head seven to eight times the anterior width of vertex; rostral prong slightly shorter than third rostral segment, originating in the proximal third of third rostral segment ( Fig. 12 ). Tylus somewhat swollen, with a pair of tufts of bristles which reach the base of the labrum ( Fig. 12 ). Forefemur narrowed at apex; stridulatory comb on foretibia consisting of 20-25 comparatively broad teeth.

Female. Width of head five to six times the anterior width of vertex. Tylus slightly swollen, without tufts of hairs.

Brachypterous form not known.

Distribution. – A widespread species recorded from India through SE Asia to Sumatra, Java and China ( Brooks, 1951; Lansbury, 1964). It has not been collected recently in the Malay Peninsula but Lansbury (1964), Fernando & Cheng (1974) and Fernando & Leong (1976) report specimens from Perak and Singapore in the British Museum of Natural History.

Figures

Figs. 12-17. Anisops male, head in lateral view. 12 A. barbatus; 13 A. bouvieri; 14 A.tahitiensis; 15 A.kuroiwae; 16 A. exiguus; 17 A. lansburyi. p = rostral prong; t = tylus.