NICO NIESER & PINGPING CHEN Tiel, The Netherlands SIXTEEN NEW SPECIES OF NEPOMORPHA (HETEROPTERA) MAINLY FROM SULAWESI (INDONESIA) Notes on Malesian aquatic and semiaquatic bugs (Heteroptera), VIII Nieser, N. & P. P. Chen, 1999. Sixteen new species of Nepomorpha (Heteroptera) mainly from Sulawesi (Indonesia). – Tijdschrift voor Entomologie 142: 77-123, figs.1-135, tabels 1, 2. [ISSN 0040-7496]. Published 22 September 1999. Representatives from the Nepomorphan families Belostomatidae, Corixidae, Helotrephidae, Micronectidae, Notonectidae, Ochteridae and Pleidae, mainly from Sulawesi, are discussed and, where appropriate, keys are provided. In addition, a table of species from Sulawesi and ad- jacent areas is provided and some comments on the biogeography of the infraorder in the area are given. The following new species are described: Micronectidae: Micronecta kymatista and Micronecta pachynychi from Sulawesi, Micronecta aleksanderi from Jawa, Micronecta skutalis from Sabah; Helotrephidae: Helotrephes otoeis from Sabah; Hydrotrephes makros and Hy- drotrephes mexon from Sulawesi, Hydrotrephes zetteli from Sangir Is., Hydrotrephes polhemi from Flores, Hydrotrephes pardalos and Hydrotrephes stereos from Mindanao; Notonectidae: Anisops rhomboides from Sulawesi, Mindanao and Brunei, Anisops salibabu from Sulawesi and Talaud Is.; Ochteridae: Ochterus homorfos and Ochterus trichota from Sulawesi, Ochterus pardalos from Mindanao. Correspondence: Dr. N. Nieser, Htg. Eduardstr. 16, 4001 RG, Tiel, NL. E-mail: if- [email protected] Key words. – Nepomorpha, Anisops, Helotrephes, Hydrotrephes, Micronecta, Ochterus new species, keys; Indonesia, Sulawesi, Sangir I., Flores, Philippines, Mindanao, Malaysia, Sabah. For the time being, this paper completes our treat- divided by the difference between width of head (D) ment of Sulawesi Nepomorpha. The set of papers and synthlipsis, in formula: 2S/(D-S). This measure- Nieser & Chen (1991, 1996 and the present one) ment buffers against peaks in the ratio synthlipsis/ provides an identification guide to all Sulawesi Nepo- width of eye, due to imperfect orientation of the morpha species. There is little doubt, however, that a head. Where necessary, other measurements will be number of undescribed species are still to be discov- discussed under the separate families. ered in Sulawesi for several families of Nepomorpha. The areas in Sulawesi used in indication of the lo- calities are the administrative provinces. Some addi- tional data on the localities sampled by Nieser in MATERIAL AND METHODS 1989 (with numbers N89xx) can be found in Nieser Measurements are in mm and are based on five & Chen (1991). Pulau Sangir is a spice island be- specimens of each sex taken from the sample contain- longing to Sulawesi Utara province. As it lies some ing the holotype (if available). They are represented as 200 Km N. of the northern point of ‘mainland’ Su- the range of the sample with the sample mean in ital- lawesi it is not on the map used in this paper (fig. ics. Length and width refer to the maximum value of 126). Remarks between braces {} after the locality the specified body part oriented horizontally; if not data contain additional information not found on the specified they refer to body length and maximal body labels. width. Body length is measured from anterior margin Abbreviations: brach. = brachypterous, macr. = of vertex to apex of hemielytra. Extremities are mea- macropterous; lvIV, lvV = 4th and 5th instar larva re- sured with the ventral side upward, this is especially spectively; L = length, W is width. important in fore tibia of male Micronecta. The ocu- lar index is computed as two times the synthlipsis (S) Specimens have been deposited in the following 77 Downloaded from Brill.com10/07/2021 03:15:39PM via free access T E, 142, 1999 collections registered according to Arnett, Samuelson small Nepomorpha and is best represented in tropical & Nishida (1993): BMKB (Kota Baru, Brunei and subtropical regions. There are at present three Darussalam); JTPC (Englewood, Co. U.S.A.); MBBJ genera, Tenagobia Bergroth, 1899 in the New World; (Bogor, Indonesia); MUDH (The Hague, The Micronecta Kirkaldy, 1897b and Synaptonecta, Lund- Netherlands); NHMW (Vienna, Austria); NMSC blad 1933 in the Old World. Of these Synaptonecta (Singapore); OXUM (Oxford, UK); RMNH (Lei- contains only a few species whereas Micronecta and den, The Netherlands); SEMC (Lawrence Ka. Tenagobia (respectively Wróblewski 1968 and Nieser U.S.A.); UPPC (Laguna, Philippines); USCP (Cebu 1977) contain a considerable number of species di- City, Philippines); ZMAN (Amsterdam, The Nether- vided over several subgenera. Many species come to lands). light and, especially in tropical Asian Micronecta, the Unregistered collections: KKUC (Khon Kaen Uni- ecology of many species is virtually unknown as they versity Entomological Collection, Thailand); NCTN are mainly known from light catches. (N. Nieser collection, Tiel, The Netherlands); The micronectid fauna of Australia (Wróblewski NPSC(Collections of National parks of Sabah, Lahad 1970) is quite different from that of the Malesian Datu); UMSK (Collections of the Universiti Archipelago from Sulawesi westward, although some Malaysia Sabah Kota Kinabalu); ZC (G. Zimmer- Australian species (e.g. M. virgata) reach Sulawesi. In mann collection, Marburg, Federal Republic of Ger- addition there are some very widespread species (e.g. many); ZCWA (Personal collection of H. Zettel, Vi- M. ludibunda, M. quadristrigata) which occur in both enna, Austria). areas. The fauna of New Guinea is poorly known, but Specimens not specified are divided between the appears to be related to the Australian fauna. The mi- collection of the collectors (see acknowledgements) cronectid fauna of the Moluccas is unknown. These and NCTN. practical restraints bring us to the following key to the Micronectidae from ‘West Indonesia’ covering the species of Indonesia from Sulawesi and Bali westward ACKNOWLEDGEMENTS and including those of N. Borneo. Thanks are due to J. van Tol (RMNH), J. P. Duf- fels (ZMAN); H. Zettel (NHMW) and G. Zimmer- Key to males of Micronectidae from ‘West mann (ZC) for the loan of specimens and additional Indonesia’ data on localities, J. T. Polhemus (JTPC) for loan of specimens and discussion of identity and nomencla- ture of some species, A. Jansson (Helsinki) and I. 1. Fore tibia and pala fused [S. India & Sri Lanka Lansbury (Oxford) for discussion of identity and through Indochina to Jawa] ......Synaptonecta issa nomenclature of some species. (Distant, 1911)................................................... ..................... (syn: S. breddini Lundblad, 1933) – Fore tibia and pala separated (Micronecta) ....... 2 SYSTEMATIC PART 2. Strigil absent ................................................... 3 – Strigil present .................................................. 6 Family Micronectidae Jaczewski, 1924 3. Small species, length less than 2 mm, hemielytra Until recently, the Micronectidae have mostly been not distinctly striped but with irregular marks considered a subfamily of Corixidae, although some which may be indistinct, right paramere relatively authors have considered them in the past to consti- broad but not widened apically (fig. 31, 40) ..... 4 tute a separate family. This started with Douglas & – Larger species, length 2 mm or more ............... 5 Scott (1865) using the name Sigaridae. Jones (1930) 4. Smaller species, length 1.1-1.3 mm, left paramere was the first to propose Micronectidae as a separate distinctly narrowing apically (fig. 33) [Jawa] M. family under that name. This was followed by some acuta Lundblad, 1933 authors, notably Poisson 1928-1938 (e.g. Poisson – Larger species, length 1.7-1.8 mm, left paramere 1938a), who later reduced this taxon, without expla- not narrowing apically (fig. 32) [Jawa] ............... nation, again to subfamily (Poisson 1938b). After .......................................... M. aleksanderi sp. n. 1948 the classification presented by Hungerford 5. Length 2.0-2.1 (& 2.2-2.4), hemielytra dark with (1948) was generally followed, but at present there is distinct longitudinal yellowish stripes which on a tendency to give this taxon family status again. This corium are partly dissolved into yellow points, will be substantiated by Jansson et al. (in prepara- right paramere apically widened due to a thinner tion). membraneous triangular lobe on the convex mar- The width of an eye in Micronectidae is measured gin of the shaft (fig. 41) [Jawa and Vietnam]..M. along the posterior margin of the head. guttatostriata Lundblad, 1933 The family Micronectidae consists of small to very – Length 3 mm or more, hemielytral pattern indis- 78 Downloaded from Brill.com10/07/2021 03:15:39PM via free access NIESER & CHEN: New Nepomorpha Sulawesi tinct, right paramere of the common evenly (fig. 49) [West Malaysia, Sumatera, Jawa, ? Bor- curved apically tapering type, left paramere as in neo] ...................... M. decorata Lundblad, 1933 fig. 44 [India through Vietnam to Taiwan, W. – Medio caudal margin of free lobe of eighth ab- Malaysia and Sumatera] M. grisea (Fieber, 1844) dominal tergite curved with a single caudal point 6. Very small species, length about 0.8 mm, right (fig. 9), apex of left paramere pointing straight paramere apically forked (fig. 42) [Jawa] ............ upward, slightly serrate (fig. 17) .................... 14 ............................... M. pumilio Lundblad, 1933 14. Left paramere with a narrow shaft (fig. 17) ... 15 – Larger species,