Xenocorixa vittipennis Horváth, 1879

Corisa vittipennis Horváth, 1879 - Horváth (1879): 151. Type locality: China, Sobsam-Timbu.

Corisa miyakei Matsumura, 1905 - Matsumura (1905): 64. Type locality: Japan, Nakano nr Tokyo.

Sigara horni Jaczewski, 1928 - Jaczewski (1928): 110. Type locality: China, Shantun, Yenchowfu.

Sigara vittipennis: Lundblad, 1933 a - Lundblad (1933): 451.

Xenocorixa vittipennis: Hungerford, 1947 - Hungerford (1947): 93.

Materials

Type status: Other material. Occurrence: recordedBy: J. - W. Cheong; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: D6551C7A-6003-5ECE-B013-EFB347211D43; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hemiptera; family: Corixidae; genus: Xenocorixa; specificEpithet: vittipennis; Location: country: South Korea; stateProvince: Gyeongsangnam-do; county: Hadong-gun; locality: Geumnam-myeon, Daesong-ri, Daesongsoryuji; verbatimElevation: 146 m; decimalLatitude: 34.977784; decimalLongitude: 127.858864; Event: eventDate: 7 VII 2010; Record Level: institutionCode: NIBR

Type status: Other material. Occurrence: recordedBy: J. Kim et al.; individualCount: 21; sex: 8 males, 13 females; lifeStage: adult; occurrenceID: 419DA9EA-197A-58D7-9BA6-9B2EDA122EAE; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hemiptera; family: Corixidae; genus: Xenocorixa; specificEpithet: vittipennis; Location: country: South Korea; stateProvince: Jeollanam-do; county: Wando-gun; locality: Wando-eup, Jeongdo-ri; verbatimElevation: 8 m; decimalLatitude: 34.309312; decimalLongitude: 126.705769; Event: eventDate: 26 VII 2024; Record Level: institutionCode: JBNU

Type status: Other material. Occurrence: recordedBy: J. Kim and D. Choi; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: A563CB13-359F-5EA2-AE7D-17652FF0D41E; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hemiptera; family: Corixidae; genus: Xenocorixa; specificEpithet: vittipennis; Location: country: South Korea; stateProvince: Incheon; county: Ongjin-gun; locality: Deokjeok-myeon, Seopo-ri; verbatimElevation: 52 m; decimalLatitude: 37.214759; decimalLongitude: 126.116845; Event: eventDate: 13 VIII 2024; Record Level: institutionCode: JBNU

Type status: Other material. Occurrence: recordedBy: J. Kim; individualCount: 45; lifeStage: 2 2 nd instar nymphs, 43 3 rd instar nymphs; occurrenceID: FAA01C47-554F-5CEB-9708-1EFE59C2979F; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hemiptera; family: Corixidae; genus: Xenocorixa; specificEpithet: vittipennis; Location: country: South Korea; stateProvince: Jeollanam-do; county: Wando-gun; locality: Wando-eup, Jeongdo-ri; verbatimElevation: 8 m; decimalLatitude: 34.309312; decimalLongitude: 126.705769; Event: eventDate: 29 II 2025; Record Level: institutionCode: JBNU

Type status: Other material. Occurrence: recordedBy: J. Kim et al.; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 32F21793-3B14-5517-B0D3-77DE2209940F; Taxon: kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hemiptera; family: Corixidae; genus: Xenocorixa; specificEpithet: vittipennis; Location: country: South Korea; stateProvince: Jeollanam-do; county: Hampyeong-gun; locality: Hampyeong-eup, Japung-ri; verbatimElevation: 113 m; decimalLatitude: 35.036441; decimalLongitude: 126.468439; Event: eventDate: 23 VI 2025; Record Level: institutionCode: JBNU

Description

Body length. ♂ 8.3–8.8 mm; ♀ 8.7–9.3 mm (based on 24 specimens).

Head (Fig. 1 D, E and G). Whitish-yellow. Head slightly longer than the pronotal disc in dorsal view, its anterior margin protruding beyond the eyes. Male fovea depressed. Infraocular area reduced. Rostrum with transverse sulcations. The antennae four segments I – IV; antennal segments I – II shorter; antennal segment IV one-third the length of the antennal segment III.

Thorax (Fig. 1 D – F, H and I). Yellowish-brown. Pronotum with distinct 6–7 dark transverse bands. Mesoepimeron raised broadly. Hemelytra with reticulation of dark lines; membrane narrow. Fore-leg similar in male and female; front tibia short; pala long, flat, densely covered with palmar hairs in ventral side; male with peg row consisting of 14 pegs. Mid-leg with 2 apical claws; claws longer than tarsus. Hind-leg shorter than mid-leg; tarsus densely covered with swimming hairs. Metaxyphus triangular.

Abdomen (Fig. 2). Yellowish-brown. Male abdominal asymmetry dextral. Strigil consisting of 14 combs. Genital capsule yellowish-brown, oval in lateral view; aedeagus apical furcate; right paramere strongly broader median to apex; left paramere strongly curved at basal 1 / 3, tapering apically.

Diagnosis

Lateral lobe of prothorax is obscured posteriorly by mesoepimeron. Mesoepimeron is shorter than width in lateral view, with a secondary suture extending across it from the lateral bend to the inner basal angle of the mesoepimeron. The last antennal segment very short, one-third the length of the antennal segment III. The pruinose area along the base of the claval suture is short and broad. Males with dextral strigil (Hungerford 1947, Hasegawa 2018).

Distribution

China (North: Beijing, Tianjin; East: Shandong, Shanghai, Zhejiang; Central: Hubei (Xie et al. 2024)), Japan (Honshu, Shikoku, Kyushu (Nakajima et al. 2020)), Korea (new record), Taiwan (Fig. 4).

Notes

Xenocorixa vittipennis was observed in an agricultural reservoir (Fig. 3 A) from South Korea near the coastal area (Fig. 5). Adults demonstrated a positive phototactic response and were collected through light traps (Fig. 3 B). In February, 2 nd and 3 rd instar nymphs were collected in an agricultural reservoir in Wando-gun (Fig. 3 C). Meanwhile, reports from Miyagi Prefecture, Japan, suggest that the species overwinters as eggs that hatch the following spring (Hasegawa 2018).

Most of the aquatic bugs are carnivorous. On the other hand, while zoophagy is the dominant feeding strategy in Corixidae, many species also consume other foods such as algae and detritus and their diet can vary significantly amongst different species, sexes or even populations of a single species, based on food availability (Haedicke et al. 2017, Xie et al. 2024). In this study, we documented the feeding behaviour of the 2 nd and 3 rd instar larvae of Xenovorixa vittipennis on frozen bloodworms under laboratory conditions (Fig. 3 D).