Laccotrephes simulatus Montandon, 1913

Polhemus, Dan A. & Polhemus, John T., 2013, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. X. Infraorder Nepomorpha-Famlies Belostomatidae And Nepidae, Raffles Bulletin of Zoology 61 (1), pp. 25-45 : 42

Laccotrephes simulatus Montandon, 1913

( Figs. 30 , 33 , 36 )

Laccotrephes simulatus Montandon, 1913: 122

Material examined. — SINGAPORE: 1 female, Sembawang , 12 Mar.1992, K1, coll. L. Yeo ( ZRC) ; 1 male, Selatar Reservoir , amongst debris in shallow water, 25 Oct.1990, coll. unk. ( ZRC) ; 1 female, Lower Peirce Reservoir , north arm, in stream, 11 Aug.1990, coll. P. K. L. Ng ( ZRC) ; 1 male, Ulu Sembawang Road , pond, 17 May 1994, coll. H. K. Lua et al. ( ZRC) ; 1 male, Kranji Reservoir, turut track off New Tiew Road , 10 Oct.1990, coll. C. M. Yang et al., YCM0031 ( ZRC) . MALAYSIA, Johor: 1 male, 1 female, Mawai, Gunung Panti foothills, 2 Dec.1998, coll. H. K. Lua, LHK420 ( ZRC) ; 1 male, between Pekan Nanas and Pentian , no vegetation, 4 Mar.1992, coll. K. L. Yeo ( ZRC) . Malacca: 1 male, 1 female, Batu Berendam , freshwater fishpond, 5 Oct.1960, coll. unk. ( ZRC) . Pahang: 1 male, 68 km. to Kuantan , 15 May 1995, B. Tan & G. Sumita, TG02 ( ZRC) ; 1 male, Gambang site, Kuantan–Kuala Lumpur road, 20 km. after junction with Kuantan–Pekan road, 23 Jul.1992, coll. M. Kottelat & P. K. L. Ng ( ZRC) ; 2 males, 1 female, Lake Chini , shore, 15 Apr.1997, YKL901Q, coll. K. L. Yeo ( ZRC) . Selangor: 3 males, 1 female, North Selangor Peat Swamp , 26 Apr.1993, coll. P. K. L. Ng ( ZRC) ; 1 female, 0.2 km. from Km. 45 on Tanjung Malim–Sungai Besar road, 18 Sep.1992, coll. P. K. L. Ng ( ZRC) . Perak: 1 male, 1500 m after Km 23 on road to Segama from Tai Ping , 6 km. after Bukit Merah , 5°5'5.1"N, 100°40'20.8"E, 18 Nov.1995, THH9587, coll. unk. ( ZRC) . Penang: 1 male, Glugor , paddy field, 24 Oct.1961, coll. unk. ( ZRC) .

Subsequently reported from Peninsular Malaysia (Johor, Malacca), Sri Lanka, China, Vietnam, Sumatra, Borneo, and the Philippines ( Lundblad, 1933; Fernando & Cheng, 1974). New records are provided herein for Singapore, and the Peninsular Malaysian states of Pehang, Selangor, Perak and Penang, as well as a better constrained record for Java.

Discussion. — This is the smallest Laccotrephes species in the region under study, with a body length of 11–18 mm, and may be separated from the similar sized L. longicaudatus by the shorter respiratory siphon, the structure of the prosternal keel (compare Figs. 33, 34 ) and the structure of the male

Extralimital material examined. — INDONESIA, Jawa Barat Prov.: 1 male, Java, Soekaboemie [Sukabumi], Croisiere du “Nirvana”, 30 Dec.1908, coll. E. Cordier ( MNHN) . Sumatera Barat Prov.: 2 males, Sumatra, Solok , Jul.1992, coll. unk. ( USNM) .

Diagnosis. — Male body length 11–16 mm, maximum width (across hemelytra) 5–6 mm, length of respiratory siphon 10–15 mm. Female body length 13–18 mm, maximum width (across hemelytra) 5–6 mm, length of respiratory siphon 14–18 mm. Colouration medium brown to reddish brown, fore femur with a single irregular dark yellow annulation near midlength, middle and hind femora each with similar marking on distal half, fore tibia with irregular dark yellow annulation on basal half; meso- and metasternum and abdominal venter orange-brown. Antennal segment III very slightly shorter than segment II, outer margin bearing a double row of long setae, the lengths of these setae approximately equal to the width of the segment, inner margin bearing scattered shorter setae, lengths of these setae about one-half as long as the width of the segment. Prosternal keel flat when viewed laterally, lacking an angular anterior projection ( Fig. 33 ). Length of respiratory siphon less than or equal to the length of the body. Male paramere forming a stout hook with a broad, blunt apex ( Fig. 36 ).

Distribution. — Originally described from “Pingschiang” (Pingxiang, Jiangxi Province), in south-central China ( Montandon, 1913), with another specimen noted from Java. paramere (compare Figs. 35, 36 ). A useful redescription of this taxon was provided by Nieser et al. (2009), accompanied by comparative figures of the prosternal carinae for L. robustus , L. pfeiferiae , L. griseus , L. longicaudatus and L. simulatus , and male parameres for L. griseus , L. maculatus , L. longicaudatus and L. simulatus .

Figures

Fig. 30. Laccotrephes simulatus Montandon, male, specimen from Malaysia, Johor.

Figs. 31–34. Laccotrephes species, prosterna, left lateral views (FC = fore coxa, PS = prosternum, PP = propleuron). 31, L. pfeiferiae. 32, L. archipelagi, specimen from Malaysia, Johor. 33, L. simulatus, specimen from Malaysia, Johor. 34, L. longicaudatus, specimen from Malaysia, Johor.

Figs. 35–38. Laccotrephes species, male parameres, left lateral views (all to same scale). 35, L. longicaudatus, specimen from Malaysia, Johor. 36, L. simulatus, specimen from Malaysia, Johor. 37, L. archipelagi, specimen from Malaysia, Johor (paramere apex only). 38, L. pfeiferiae, specimen from Laos, Vientiane Prov. (paramere apex only).