Anisops nigrolineatus Lundblad, 1933

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 : 88

Anisops nigrolineatus Lundblad , new record

Anisops nigrolineata Lundblad, 1933 ; Brooks 1951 (redescription).

Diagnosis. – Macropterous form blackish, rather slender, fusiform, greatest width at level of apex of scutellum.

Length, male and female 5.4-6.6; width, male and female 1.5- 1.8. Colour generally black. Width of head four to five times the anterior width of vertex. Tylus flat, somewhat laterally expanded. Synthlipsis wide, about one half anterior width of vertex. Labrum without specialized hairs. Pronotum relatively long, its humeral width about 1.5 times its median length which is twice the median length of head.

Male. The vertex protrudes in front of the eyes, both in dorsal ( Fig. 27 ) and lateral view. Rostral prong longer than third rostral segment originating near its base. Forefemur strongly narrowed apically. Tibial comb with about 22 teeth of which the apical 14 are slender and long, more than twice the length of the basal eight which are oriented in a different direction ( Fig. 22 ).

Female. Vertex not protruding anteriorly of eyes. Tylus slightly swollen.

Brachypterous form, Brooks (1951) recorded a pale form. This may be either the brachypterous form or specimens which have been for a long time in alcohol. So far no brachypters have been examined by the author.

Remarks. – Males characterized by the stridulatory comb ( Fig. 22 ). Females similar to those of A. tahitiensis which have, however, head and pronotum of subequal length.

Distribution. – Widespread, described from Java and recorded from The Philippines, Thailand, Burma and India where it seems to have its main distribution ( Brooks, 1951). In the ZRC are three samples with this species: Two from Selangor [Ulu Gombak, Sungai Gombak, 14 Nov.1995, coll. C. M. Yang et al. 3 males 2 females and Ulu Gombak, upland pond nr. Sendlo ridge, 16 Nov.1995, coll. Yang et al. 4 males 2 females] and one from Pahang [Kuala Lipis, pool by mud brook, 12 Apr.1997, coll. K. L. Yeo, 1 female]. Not recorded from Singapore.

Figures

Fig. 27. Anisops nigrolineatus, male, habitus in dorsal view, length 6.3 mm.

Figs. 21-23. Anisops, male, stridular comb. 21 A. lansburyi; 22 A. nigrolineatus; 23 A. tahitiensis.