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The genus Tachinus Gravenhorst contains about 250 species worldwide and 191 species in the Palaearctic region, 78 species in China and 18 species in Japan (Feng et al., 2013; Schülke and Smetana, 2015). In Korea, six species have been recorded (Kim and Ahn, 2000; Ahn et al., 2017).
Members of Tachinus occur on rotten fungi, leaf litter, and decaying organism. Some species are found in cool and humid habitats such as streamside and wetland. In this paper, we report Tachinus (T.) javanus Cameron for the first time in the Korean peninsula and redescribe T. (T.) yezoensis Li with male characteristics. Photographs of adult habitus, key, and diagnostic characters with line drawings of these two species are provided.
Materials and Methods
The specimens used in this study are deposited in the Chungnam National University Insect Collection (CNUIC), Daejeon, Korea and the Hannam University Natural History Museum (HUNHM), Daejeon, Korea.
Taxonomic accounts
Genus TachinusGravenhorst, 1802 북방뾰족반날개속(개칭) (Fig. 1)
TachinusGravenhorst, 1802: 134 Type species: Staphylinus rufipesLinnaeus, 1758.
See Schülke and Smetana (2015) for the detailed synonymy.
Diagnosis. Body black to brown, usually convex; sides of abdomen triangularly narrowed; head narrower than pronotum; maxillary palpi with 4 palpomeres, filiform, palpomere 4 longest; pronotum glabrous, convex, posterior margin wider than anterior margin; elytra longer than wide, glabrous; legs moderately long, tibiae with spines, tarsal formula 5-5-5; abdominal tergite III with pruinose spots; tergites III-VI with broad paratergites; male tergite VIII usually with 4 lobes; sternite VII with particular pattern of granules or spines; sternite VIII emarginate; genitalia with paramere paired; female tergite VIII with 4 lobes; female sternite VIII with 6 lobes, inner lobes with setae or fused (Campbell, 1973; Li, 1995a).
Key to the known species of Korean Tachinus
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1. Antennomeres 1-2 glabrous, 3 with few setae, 4-11 densely pubescent ··· T. (Tachinoderus) nigriceps rubricollis (Fig. 1B)
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2. Head and elytra without microsculptures ··· T. (T.) javanus
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3. Lateral margin of pronotum reddish brown to yellowish brown ············································································· 4
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4. Elytra black, posterior margin brown; male sternite VII with spoon-like setae (Kim and Ahn, 2000: Fig. 4C); female sternite VIII without triangular process ····························· ·················································· T. (T.) sibiricus (Fig. 1E)
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- Elytra with yellow spots on humeral region, posterior margin yellow; male sternite VII without spoon-like setae; female sternite VIII with triangular process (Kim and Ahn, 2000: Fig. 1F) ······················· T. (T.) marginatus (Fig. 1D)
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5. Male sternite VIII with long and stout inner lobes (Fig. 3C) ································································ T. (T.) yezoensis
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6. Male sternite VII emarginate widely (Campbell, 1973: Fig. 66); female sternite VIII emarginate with 6-lobes (Campbell, 1973: Fig. 12D) ·········································· T. (T.) basalis
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- Male sternite VII emarginate narrowly (Kim and Ahn, 2000: Fig. 3A); female sternite VIII not emarginate without lobe ············································· T. (T.) gelidus (Fig. 1C)
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Tachinus (Tachinus) javanusCameron, 1937 붉은북방뾰족 반날개(신칭) (Figs. 1A, 2)
Tachinus javanusCameron, 1937: 35.
Tachinus shibataiHayashi, 1987: 13; Li, 1995b: 204; Schülke, 2004: 952.
Description. Body length 4.9-5.5 mm. Head reddish brown; mouthparts reddish brown to yellowish brown; antennae, pronotum, elytra, abdomen reddish brown. Head small, finely punctate. Mouthparts. Mandible asymmetrical. Maxillary palpomere 2 robust, slightly longer than 3, 3 shortest, 4 longest, about 2.0 times as long as 3. Labial palpi robust, 1 longest, 2 shortest. Thorax. Pronotum convex, about 1.5 times as long as wide, with microsculpture at antero-lateral margin, anterior margin distinctly convex; posterior margin 1.4 times as wide as anterior margin. Prosternum with few setae. Procoxal process short and sharp. Elytra suture 1.3 times as long as median part of pronotum, 1.2 times as wide as long, subparallel-sided, posterior-lateral margin rounded. Mesoventrite with 4 setae on middle part, with distinct microsculpture. Mesocoxal process narrow and long; metacoxal process concealed. Isthmus absent. Legs. Long and slender with spines, tarsomere 4 shortest, tarsomere 5 longest, tarsomeres 1-4 getting shorter, gradually broad apically. Protarsomeres 1-4 heart shaped. Meso-metatarsus filiform. Abdomen. Tergites III-IV with pruinose spots. Male. Tergite VIII (Fig. 2A) with 4 lobes. Sternite VII (Fig. 2B) depressed at posterior-medial part; without granules but some short setae at sides of depression. Sternite VIII (Fig. 2C) inner lobes separated by deep emargination. Genitalia (Fig. 2D). Paramere long and thin; apex bent like hook. Median lobe narrowed to apex; apex with lobe. Female. Tergite VIII (Fig. 2E) with 4 lobes; inner lobes longer than outer lobes. Sternite VIII (Fig. 2F) with 6 lobes; inner lobes with short spines.
Materials examined. KOREA: Gangwon Prov.: 1♂, Yanggu-gun, Yanggu-eup, Mt. Samyeong, N38° 4'12.18" E 127°56'5.93", 14 VII-12 VIII 2003, SJ Park, DH Lee, FIT. Gyeonggi Prov.: 2♀, Yangju-gun Jangheung-myeon, Songschu, Mt. Bukhansan, 26 VII-31 VIII 2001, KJ Ahn, SJ Park, CW Shin, FIT (1♀, on the slide).
Distribution. Korea, China (Fujian, Hubei, Shaanxi, Sichuan), Japan, Russia (Far East), Oriental Region.
Remarks. The species is recorded for the first time in Korea and can be distinguished from other species by the head and elytra without microsculpture, male sternite VII without granules and paramere of genitalia bent like a hook at apex.
Tachinus (Tachinus) yezoensis Li, 1995a 큰갈색북방뾰족반 날개(개칭) (Figs. 1F, 3)
Tachinus yezoensisLi, 1995a: 67; Kim and Ahn, 2000: 130; Schülke and Smetana, 2015: 484.
Redescription. Body length 7.1-8.5 mm. Head black. Mouthparts, antenna reddish brown. Pronotum black. Elytra reddish brown, posterior margin black. Coxae, femora black, tibia, tarsus reddish brown. Head. Small with dense microsculptures and punctures. Eyes protruded. Mouthparts. Mandible asymmetrical. Maxillary palpomere 2 robust, slightly longer than 3, 3 shortest, 4 longest, about 2.0 times as long as 3. Labial palpi robust, palpomere 1 longest, 2 shortest. Thorax. Pronotum convex, about 1.3 times as wide as long, with dense microsculptures and punctures; anterior margin distinctly convex; posterior part 1.5 times as wide as anterior margin. Prosternum with few setae. Procoxal process short and sharp. Elytra suture about 1.4 times as long as median part of pronotum, 1.2 times as wide as long, subparallel-sided, dense microsculptures and punctures present, posterior-lateral margin rounded. Mesoventrite with 3 setae on middle part, with distinct microsculpture. Mesocoxal process narrow and long; conceal metacoxal process. Isthmus absent. Legs. Long and slender with setae, tarsomere 4 shortest, tarsomere 5 longest, 1-4 getting shorter, gradually broad apically. Protarsomeres 1-4 heart shaped. Meso-metatarsus filiform. Abdomen. Tergites III-IV with pairs of pruinose spots. Male. Tergite VIII (Fig. 3A) elongate, narrowed to apex with 4 lobes, inner lobes with short setae, outer lobes with long setae. Sternite VII (Fig. 3B) trapezoidal, roundly and deeply emarginate on posterior margin, granules arranged throughout emargination. Sternite VIII (Fig. 3C) with 4 lobes, inner lobes separated by deep emargination, outer lobes depressed with setae. Genitalia. (Fig. 3D) Median lobe long, tapered to apex; paramere long, thin and narrowed to apex. Female. Tergite VIII (Fig. 3E) with 4 lobes, inner lobes shorter than outer lobes, outer lobes narrowed to apex. Sternite VIII (Fig. 3F) with 5 lobes, inner lobe fimbriate at apical margin.
Materials examined. KOREA: Gangwon Prov.: 1♂2♀, Pyeongchang-gun Jinbu-myeon, Mt. Odaesan, Sangwonsa, N37°47’10’’ E128°33’57.2’’, 19 IV 2007-11 V 2007, TK Kim, YH Kim, FIT; 1♂, Pyeongchang-gun Jinbu-myeon, Mt. Odaesan, Sangwonsa, 25-26 IV 2001, KJ Ahn, sifting; (1♂ on slide) 1♀, Pyeongchang-gun Jinbu-myeon, Mt. Odaesan, Sangwonsa, 18 VI-22 VII 2004, SJ Park, KM Yang, DH Lee, FIT (1♀ on slide).
Distribution. Korea, Japan.
KSAE
