Japanese Journal of Systematic Entomology, 24 (1): 21–28. June 15, 2018.

Ⓒ Japanese Society of Systematic Entomology

Notes on the Genus Indalmus (Coleoptera: Endomychidae), with Redescription of I. quadripunctatus (Ohta, 1931)

Koichi SOGOH and Hiroyuki YOSHITOMIEntomological Laboratory, Faculty of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, 790-8566 Japan

Abstract The specimen data of nine species of the genus Indalmus preserved mainly in Ehime University Museum are reported. Indalmus quadripunctatus (Ohta) is redescribed based on additional specimens. The new distributional records are as follows: I. angusticollis Gerstaecker, 1858 from Laos and Malaysia; I. lineellus (Chapuis, 1876) from Indonesia (Yamdena Is.); I. malayanus malayanus Arrow, 1926 from Laos and Vietnam; and I. medogensis Chang & Ren, 2013 from Vietnam.

IntroductionThe genus Indalmus Gerstaecker, 1858 (Coleoptera,

Endomychidae, Lycoperdininae) is represented by 36 species (+ 2 subspecies) distributed in Africa, Madagascar, India, Sri Lanka, Indochina, East Asia, Southeast Asia, Papua New Guinea and Australia (Tomaszewska, 2005; Shockley et al., 2009; Chang & Ren, 2013). This genus belongs to the Eumorphus genus group together with 13 genera (Avencymon, Encymon , Eumorphus , Platindalmus , Parindalmus , Malindus, Callimodapsa, Cymones, Haploscelis, Chetryrus, Microtrycherus, Trycherus, and Ancylopus) (Tomaszewska, 2005).

Strohecker (1979) reviewed the Asian and Australasian species of this genus, but it is possible that the distribution of each species is unclear because the specimens used in that study were limited. In addition, Indalmus quadripunctatus (Ohta, 1931) described from Taiwan was not reviewed, because he could not examine any specimens of this species.

In this paper, we report the specimen data of nine species of the genus Indalmus preserved mainly in Ehime University Museum, and redescribe Indalmus quadripunctatus (Ohta, 1931) based on the Japanese specimen.

Material and MethodsThe materials examined in this paper are preserved in

Ehime University Museum, Matsuyama, Japan (EUMJ); Kyushu University Museum, Japan (KUMJ); and Systematic Entomology, Hokkaido University, Sapporo, Japan (SEHU).

General observations, dissections and microstructures of dissected parts were made under a Leica MZ95. After observation, the dissected parts were mounted on the same card with the specimen. Photographs were taken under a Leica MZ95.

Technical terms refer to Tomaszewska (2005) and Sogoh & Yoshitomi (2017).

Morphological abbreviations used in this study are as follows: EL: elytral length from anterior margin to elytral apex; EW: maximum elytral width; PML: pronotal length in median line; PSL: pronotal length from anterior angle to posterior margin; PW: maximum width of pronotum; TL: total length (PML + EL). The average is given in parenthesis after the range. The new distributional records are marked with an asterisk (*).

Indalmus Gerstaecker, 1858

Indalmus Gerstaecker, 1858: 185. Tomaszewska, 2005: 46 [redescription]. Type species: Eumorphus kirbyanus Latreille, 1807.

Mycella Chapuis, 1876: 104. Type species. Mycella lineella Chapuis, 1876.

Diagnosis. Body elongate or oval and glossy. Antennae shorter than 1/2 of TL; antennal club 3-segmented, loose. Pronotum bearing short setae in anterior margin, with stridulatory membrane; anterior angles slightly acute; posterior angles almost right angled; lateral sulci deep, slightly long and subparallel. Prosternal process long and slightly slender. Metaventrite transverse, punctate and setose; anterior margin widely bordered, with three pairs of mycangial pits. Elytra oval to oblong, with four yellow to orange markings in most species, with obscure two markings or without markings in some species; latero-basal markings (lb) oval to transverse; latero-apical markings (la) oval to transverse, situated in apical 1/4. Male sternite 8 narrow and emarginate at middle. Male genital segment with paired apophyses fused in apical 1/3. Aedeagus moderately long, strongly sclerotized, stout; median lobe having two processes (ab and sb) in apical part; apical branch (ab) projecting apically; subapical branch (sb) situated under ab; tegmen placed at base of median lobe, ring-like shaped, fused with parameres. Female genitalia with transversal tergite 8; sternite 8 separated two plates and fused with ovipositor; styli present.

Remarks. This genus resembles Callimodapsa Strohecker, 1974 and Parindalmus Achard, 1922, but differs from them by the following characteristics; antennae and legs longer and more slender separate it from Callimodapsa; pronotum not much narrower than base of the elytra separate it from Parindalmus (Tomaszewska, 2005).

Indalmus quadripunctatus (Ohta, 1931)(Figs. 1, 2, 3A)

Encymon ruficephalus quadripunctatus Ohta, 1931: 222.Indalmus quadripunctatus: Chûjô, 1938: 398; 1939: 92 [note];

Strohecker, 1953: 80 [list]; 1979: 283; Sasaji, 1983: 6 [list]; 1985: 242 [note, photo]; Tomaszewska, 2007: 564 [catalogue]; Shockley et al., 2009: 54 [list].

Specimens examined. [Japan: Yaeyama Isls.] < Ishigaki-

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jima > 1 ♀ (EUMJ), Oh-take, 23–29. iii. 1996, H. Yoshitomi leg.; 1 ♀ (EUMJ), Urasoko, 17. iii. 1999, H. Nakanishi leg.; 1 ♀ (KUMJ), Yonehara, 2. iii. 1983, Y. Matsunaga leg.; 1 ♂ (KUMJ), Hegina, 22. v. 1975, T. Takahashi leg.; 1 ♀ (SEHU), Banna-san, 1. viii. 1971, I. Matoba leg.

Distribution. Japan: Yaeyama Isls. (Ishigaki-jima); Taiwan.

Redescription. Male. Body elongate, glossy, black, with distinct large orange marking on elytra; latero-basal (lb) markings oblique, attached with lateral margins; latero-apical (la) markings large and oblong; leg black, but tarsus brown.

Head densely and irregularly covered with small punctures. Antennomere 9 slender; antennomere 7 bulbous; approximate ratio of each antennomere (n = 1) as 1.75 : 1.19 : 1.38 : 1.06 : 1.25 : 1.25 : 1.31 : 1.38 : 2.50 : 1.00 : 2.38. Pronotum transverse, glossy, densely and irregularly covered with definite punctures; anterior angles acute; posterior angles right angled; lateral margins curved in apical 1/3; lateral sulci straight, deep, long and subparallel; PW/PML 1.90; PW/PSL 1.41; PML/PSL 0.74. Elytra glossy, elongate, densely and irregularly covered with definite punctures, widest at middle; EL/EW 1.53; EL/PL 3.71; EW/PW 1.27; TL/EW 1.94. Mesoventrite with a pair of mycangia near anterior margin; intercoxal process long, narrow and widest at base. Metaventrite transverse, punctate and slightly pubescent;

anterior margin widely bordered. Fore tibia convex in apical 3/7 of inner margin, serrate from middle to apex, with small tooth at apex; middle tibia incurved at apex, serrate from middle to apex, with small tooth at apex. Ventrite 5 deeply notched at apex. Aedeagus strongly sclerotized and stout; median lobe straight, ventrally ridge from base to apex; apical branch (ab) short and slender, slightly expand at apical part; subapical branch (sb) short and slightly curved to apex.

Female. Sexual dimorphism distinct in the following characteristics: antennomere 9 stout; antennomere 7 slender; approximate ratio of each antennomere (n = 1) as 1.88 : 1.25 : 1.38 : 1.00 : 1.13 : 1.00 : 1.19 : 1.15 : 2.25 : 1.06 : 2.25; legs slender, without projection in tibiae; ventrite 5 slightly rounded at apex; left plate of sternite 8 fused by stout plate and right plate fused by slender plate; ovipositor small; PW/PML 1.54–1.58 (1.56); PW/PSL 1.36–1.39 (1.37); PML/PSL 0.88–0.88 (0.88); EL/EW 1.54–1.56 (1.55); EL/PML 3.07–3.09 (3.08); EW/PW 1.26–1.29 (1.27); TL/EW 2.04–2.06 (2.05).

Measurements. Male (n = 1). TL 5.93 mm; PW 2.40 mm; PML 1.26 mm; PSL 1.70 mm; EL 4.67 mm; EW 3.05 mm. Female (n = 2). TL 5.49–5.56 (5.53) mm; PW 2.08–2.15 (2.12) mm; PL 1.35–1.36 (1.36) mm; PL 1.53–1.55 (1.54) mm; EL 4.14–4.20 (4.17) mm; EW 2.69–2.70 (2.70) mm.

Remarks. This species was originally described from

Fig. 1. Left antennae (A–B), pronotum (C), meso- and metaventrites (D), and abdominal ventrites (E–F) of Indalmus quadripunctatus (Ohta). –––– B, E, Male; A, F, female. Scale bars = 1.00 mm.

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Taiwan (Ohta, 1931), and Nakane (1981) was recorded from Japan. This species is similar to I. lineellus (Chapuis, 1876) in having slender antennomeres 9–11; strongly elongate elytra; prosternal process strongly slender; male ventrite 5 deeply notched at apex; aedeagus with somewhat short subapical branch (sb), but differs from the latter by the following characteristics: elytra with distinct four markings (two obscure markings in lineellus); aedeagus stout, apical branch (ab) longer than subapical branch (sb) (slender, ab shorter than sb in lineellus).

Indalmus angusticollis Gerstaecker, 1858(Figs. 3B, 4A)

Indalmus angusticollis Gerstaecker, 1858: 187. Arrow, 1925: 329 [note]; Strohecker, 1953; 79 [list]; 1979: 284 [note]; Shockley et al., 2009: 52 [list].

Indalmus latus Arrow, 1925: 325. Strohecker, 1953; 80 [list]. Synonymized by Strohecker (1979).

Specimens examined. [Laos] 1♂1♀ (EUMJ), Vang Vieng Vientiane Prov, 8. v. 2002, N. Ohbayashi leg.; 1♀ (EUMJ),

Fig. 2. Male of Indalmus quadripunctatus (Ohta), 1931. –––– A–C, Aedeagus in dorsal (A), lateral (B), and ventral views (C); D, tergite 8; E, sternite 8; F, genital segment; G, female genitalia; male fore (H) and middle (I) tibiae. Scale bar = 1.00 mm. ab: apical branch, sb: subapical branch, ep: endophallus.

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Fig. 3. Habitus of Indalmus spp. – A, Indalmus quadripunctatus (Ohta, 1931); B, I. angusticollis Gerstaecker, 1858; C, I. kirbyanus (Latreille, 1807); D, I. lineellus (Chapuis, 1876); E, I. liuchungloi Kryzhanovskij, 1960; F, I. malayanus malayanus Arrow, 1926; G, I. medogensis Chang & Ren, 2013; H, I. nanus (Arrow, 1920); I, I. hirsutus Strohecker, 1944. Scale bar = 3.0 mm. la: latero-apical marking; lb: latero-basal marking.

25Notes on Indalmus (Coleoptera: Endomychidae)

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Ban Saleui, Houn Phan Prov. Alt. 1,400–1,500 m, 20–24. vi. 2003, N. Ohbayashi leg.; 3♂ (EUMJ), Hoeirhen Vangvieng Vientiane Prov., 3. iv. 2007, N. Ohbayashi leg. [Malaysia] 1♂ (EUMJ), Cameron-High-Lands, 1986; 2♂4♀ (EUMJ), Ulu Gombak, Malaya Univ Forest, 18. xii. 2010, L. Takechi leg.

Distribution. Laos*, Malaysia*, Myanmar, Sumatra, Thailand, Vietnam.

Diagnosis. Tooth of male middle tibia long. Elytral markings (la and lb) large and oval. Median lobe without apical branch (ab), with strongly curved subapical branch (sb).

Remarks. This species was described from Myanmar, and this is the first record of this species from Laos and Malaysia.

Indalmus kirbyanus (Latreille, 1807)(Figs. 3C, 4B)

Eumorphus kirbyanus Latreille, 1807: 72. Indalmus kirbyanus: Gerstaecker, 1858: 186 [list]; Arrow,

1925: 324 [note]; Strohecker, 1953: 80 [list]; 1979: 283 [note]; Tomaszewska, 2007: 564 [catalogue]; Shockley et al., 2009: 53 [list].

Ancylopus nigrothoracica Pal, 2003: 113. Synonymized by Pal (2004).

Indalmus latefasciatus Pic, 1929: 15. Strohecker, 1953: 80 [list]. Synonymized by Strohecker (1979).

Ancylopus atricornis Pic, 1921: 2. Synonymized by

Fig. 4. Aedeagus of Indalmus spp. in dorsal views. ––– A, Indalmus angusticollis Gerstaecker, 1858; B, I. kirbyanus (Latreille, 1807); C, I. lineellus (Chapuis, 1876); D, I. liuchungloi Kryzhanovskij, 1960; E, I. malayanus malayanus Arrow, 1926; F, I. medogensis Chang & Ren, 2013; G, I. nanus (Arrow, 1920); H, I. hirsutus Strohecker, 1944. Scale bar = 1.0 mm. ab: apical branch, sb: subapical branch.

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Strohecker (1979).

Specimens examined. [China] 1♂1♀ (EUMJ), Arutaiph, Xishung Banna, 4. v. 1982, M. Takakuwa leg.; 1♂ (EUMJ), Chi-Hung, Xishung Banna, 5. v. 1982, M. Takakuwa leg. [India] 1♀ (EUMJ), Manjitar (320 m) Darjeeling Dist, 29. ix. 1983, M. Sakai leg.; 1♀ (EUMJ), ditto, 8. xi. 1981, M. Sakai leg. [Laos] 2♂ (EUMJ), Vang Vieng Vientiane Prov, 8. v. 2002, N. Ohbayashi leg.; 1♂ (EUMJ), ditto, 8. v. 2003, N. Ohbayashi leg.; 1♂1♀ (EUMJ), NW Muang Xay 25km Oudom Xay, 3. v. 2005, J. Yamasako leg.; 1♀ (EUMJ), E. Phonsavan 25 km Xiang Khoang, 19. vi. 2005, J. Yamasako leg.; 1♀ (EUMJ), Hoeirhen Vangvieng Vientiane Prov., 3. iv. 2007, N. Ohbayashi leg. [Thailand] 1♂1♀ (EUMJ), Fang, 20. xi. 1968, M. Satô leg.; 1♂ (EUMJ), Meso Khun Klang alt. 1,350 m, Doi Inthanon, 19. x. 1983, M. Sakai leg. [Vietnam] 1♀ (EUMJ), Lai Chau Prov. 10km, S of Lai Chau, alt. 810 m, 29–30. vi. 1997, C F. Lee leg; 1♂ (EUMJ), [VN28] BaBe, Bac Kan Prov., 22. 254.70N, 105. 385.95E, ca 292 m, 2–6. vii. 2014, H. Yoshitomi leg.

Distribution. Cambodia, China, India, Laos, Myanmar, Nepal, Taiwan, Thailand, Vietnam.

Diagnosis. Male fore tibia with long tooth. Elytral markings (la and lb) transverse, bisinuate in anterior and posterior margins. Median lobe straight and long; apical branch (ab) slightly short and slender, slightly curved at apex; subapical branch (sb) slender and longer than ab, curved at apex.

Remarks. This is the type species of Indalmus. This species is similar to I. liuchungloi Kryzhanovskij, 1960, but is separated from it by the long tooth of male fore tibia.

Indalmus lineellus (Chapuis, 1876)(Figs. 3D, 4C)

Mycella lineella Chapuis, 1876: 105.Indalmus lineellus: Strohecker, 1953: 80 [list]; Shockley et

al., 2009: 53 [list].Indalmus lineella: Strohecker, 1979: 283 [note].

Specimens examined. [Indonesia: Tanimbar Isls.] < Yamdena Is. >1♂1♀ (EUMJ), 150 m alt. 22 km NE Saumlaki man's Vill, 27. xi–11. xii. 2005, St. Jaki leg.

Distribution. Australia, Papua New Guinea, Indonesia (Yamdena Is)*.

Diagnosis. Male tibiae without distinct sexual characters and ventrite 5 deeply notched at apex. Elytra with obscure longitudinal markings. Median lobe straight and long; apical branch (ab) and subapical branch (sb) short, slender and almost same length.

Remarks. This species was described from Australia (Queensland), and this is the first record from Indonesia (Yamdena Is.).

Indalmus liuchungloi Kryzhanovskij, 1960(Figs. 3E, 4D)

Indalmus liuchungloi Kryzhanovskij, 1960: 871. Strohecker, 1979 [note]: 284; Shockley et al., 2009: 54 [list].

Specimens examined. [Laos] 2♂ (EUMJ), Nong Het Xjang Khoang Prov, 16–18. vi. 2005, H. Wakahara leg.; 1♀ (EUMJ), ditto, 16–18. vi. 2005, J. Yamasako leg.; 1♀ (EUMJ), ditto, 24. vi. 2006, J. Yamasako leg.; 1♀ (EUMJ), ditto, 20. vi. 2006, J. Yamasako leg.; 1♂ (EUMJ), Ban Ban (Muang Kham), alt. 550 m, 5. iv. 2007, K. Ando leg.; 1♂2♀ (EUMJ), Ban Ban-Ban Saleui Xiang Khoang-Xan Neua, 27. iii. 2005, J. Yamasako leg.; 1♀ (EUMJ), E Phonsavan 25 km Xiang Khoang, 2. iv. 2005, J. Yamasako leg.; 1♂ (EUMJ), E Phonsavan 26 km Xiang Khoang, 2. iv. 2005, J. Yamasako leg.; 2♀ (EUMJ), NNW Louang Namtha 39 km Louang Namtha, 4. v. 2005, J. Yamasako leg.; 13♂9♀ (EUMJ), [LA26] Ban Muang, Xieng Khouang Prov., N19.093121 E103.421384, 1,435 m, 22–28. IV. 2018, , H. Yoshitomi leg.

Distribution. China, Laos, Myanmar, Vietnam.Diagnosis. Male fore tibia with short tooth. Elytral

markings (la and lb) transverse, sinuate in anterior and posterior margins. Median lobe straight and widened at apex; apical branch (ab) long and slender; subapical branch (sb) long, slender and almost as long as ab.

Remarks. This species is similar to I. kirbyanus (Latreille, 1807) in the general appearance and male genital feature, but differs from it by the shape of aedeagus. The specimens in [LA26] Ban Muang were collected from bamboo fence and dry leaves.

Indalmus malayanus malayanus Arrow, 1926(Figs. 3F, 4E)

Indalmus malayanus Arrow, 1926: 249. Strohecker, 1953: 80 [list].

Indalmus malayanus malayanus: Strohecker, 1979: 285 [note, fig, photo]; Shockley et al., 2009: 54 [list].

Specimens examined. [Malaysia: Borneo] 1♂ (EUMJ), Polling Hot Spring Sabah, 3. xi. 1979, S. Nagai leg.; 1♀ (EUMJ), Polling nr. Ranau Sabah, 30. iv. 1980, M. &A. Sakai leg. [Laos] 1♂ (EUMJ), Vang Vieng Vientiane Prov, 8. v. 2002, N. Ohbayashi leg.; 1♀ (EUMJ), Ban Saleui, Houn Phan Prov. Alt. 1,400 m, 16. vi. 2003, N. Ohbayashi leg. [Vietnam] 1♂ (EUMJ), [VN28] BaBe, Bac Kan Prov., 22. 2529.39N, 105. 3819.09E, ca 277 m, 5. vii. 2014, H. Yoshitomi leg.

Distribution. Borneo, Laos*, Malaysia, Sumatra, Vietnam*.Diagnosis. Elytral markings (la and lb) large and oval.

Median lobe straight and slightly short; apical branch (ab) short and slender; subapical branch (sb) short and more slender than ab.

Remarks. This species was described from Borneo and this is the first record from Laos and Vietnam.

Indalmus medogensis Chang & Ren, 2013(Figs. 3G, 4F)

Indalmus medogensis Chang & Ren, 2013: 357.

Specimens examined. [Vietnam] 1♂ (EUMJ), [VN28] BaBe, Bac Kan Prov., 22. 2445.10N, 105. 3739.75E, ca 291 m, 2–5. vii. 2014, H. Yoshitomi leg.

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Distribution. China, Vietnam*.Diagnosis. Male fore and middle tibiae with teeth. Elytral

markings (la and lb) small and oval. Median lobe straight and long; apical branch (ab) short, broad and flat; subapical branch (sb) long and curved at middle.

Remarks. This species was described from China, and this is the first record from Vietnam. This species is similar to I. distinctus in general appearance, but can be differentiate by the broader elytra, sides of pronotum subparallel and weakly constricted at basal 1/3, and mesotibia of male without tooth (Chang and Ren, 2013).

Indalmus nanus (Arrow, 1920)(Figs. 3H, 4G)

Eumorphus nanus Arrow, 1920: 326.Indalmus nanus: Strohecker, 1971: 14; 1979: 288 [note, fig,

photo].Engonius minutus Pic, 1927: 11. Synonymized by Strohecker

(1971).

Specimens examined. [Vietnam] 1♂ (EUMJ), [VN32] BaBe, Bac Kan Prov., 22. 2529.39N, 105. 3819.09E, ca 277 m, 5. vii. 2014, H. Yoshitomi leg.; 2♂ (EUMJ), [VN49] Cue Phuong NP, Nith Binh Prov., (369 m), 20. 210076, 105. 353544 , 4–8. iii. 2015, H. Yoshitomi leg.; 1♀ (EUMJ), [VN50] Cue Phuong, Nith Binh Prov., (165 m), 20. 140595, 105. 420878, 6. iii. 2015, H. Yoshitomi leg.

Distribution. Vietnam, Cambodia, Laos.Diagnosis. Male fore tibia with tooth. Elytral markings (la

and lb) large and oval. Median lobe straight and long; apical branch (ab) short, curved laterally; subapical branch (sb) slender, longer than ab, hooked at apex.

Remarks. This species is similar to I. coomani coomani, but separated by the wider elytra (Strohecker, 1979).

Indalmus hirsutus Strohecker, 1944(Figs. 3I, 4H)

Indalmus hirsutus Strohecker, 1944: 139. Strohecker, 1953: 80 [list]; 1979: 289 [note]; Shockley et al., 2009: 53 [list].

Specimens examined. [Indonesia] < Java Is. > 1♀ (EUMJ), Mt. Argopuro, East Java, v. 1997, Native leg. 1♂3♀ (EUMJ), Pangia Sulawesi Selatan, 27. xii. 1999, N. Ohbayashi leg.; 1♀ (EUMJ), Bantimulung Sulawesi Selatan, 19. xii. 1999, N. Ohbayashi leg.

Distribution. Indonesia (Sulawesi, Java).Diagnosis. Male tibia without distinct sexual characters and

ventrite 5 flat at apex. Elytral markings (la and lb) transverse, sinuate in anterior and posterior margins. Median lobe stout; apical branch (ab) short and pointed at apex; subapical branch (sb) slender, longer than ab, pointed at apex.

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[Received: April 2, 2018; accepted: April 10, 2018]