Coelostoma (Holocoelostoma) bhutanicum Jayaswal, 1972

Liu, Hsing-Che, Hu, Fang-Shuo & Fikáček, Martin, 2020, Review of the genus Coelostoma of Taiwan with description of a new species (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae 60 (1), pp. 155-162 : 158

publication ID	https://doi.org/ 10.37520/aemnp.2020.008
publication LSID	lsid:zoobank.org:pub:16B1C03F-93E7-4BFF-B895-F846EA4CD029
persistent identifier	https://treatment.plazi.org/id/B7538796-5F46-BF3B-FF11-FEF2FE5FF7A7
treatment provided by	Tatiana
scientific name	Coelostoma (Holocoelostoma) bhutanicum Jayaswal, 1972
status

Treatment

( Figs 2E View Fig , 3C View Fig )

Coelostoma (Holocoelostoma) bhutanicum Jayaswal, 1972: 409 .

Material examined. TAIWAN: TAIPEI: 1 ( TARI):Taihokn,Ankeng [% AE], 2.xi.1941, S.Miyamoto leg.; 1 ( TARI):Taihokn, 2.iv.1940, S. Miyamoto leg. PENGHU: 1, 1 ♀♀ ( NMNS):Makung [Ṛċ], 19.vi.2000, C.-S. Lin & W.-T.Yang leg. TAICHUNG: 1 ( HCLC):Wufeng District [Ẕḇdz], Tonglin Vill. [ṖIJm], 24.0768°N 120.7252°E, 110 m, 19.x.2018, Hsing- Che Liu leg, at the edge of a stream,beneath a stone; 3 ( HCLC):Wufeng District [Ẕḇdz], Tonglin Vill.[ṖIJm], 24.0768°N 120.7252°E, 110 m, 29.x.2018, Hsing-Che Liu leg, at the edge of a stream, beneath a stone; 1

( HCLC):Wufeng District [Ẕḇdz], Tonglin Vill. [ṖIJm], 24.0768°N 120.7252°E, 110 m, 5.xi.2018, Hsing-Che Liu leg, at the edge of a stream, beneath a stone. TAITUNG: 1 1 ♀ ( NMNS): Lanyu Yurean [ÊṈĕƛ], III/6/2012, Y. T. Wang (ŦṪŽ). CHANGHUA: 3 spec. ( HCLC): Fuxing Township [ĞḄǿ], Fubao Village [Ğã], 24.046974°N 120.398450°E, 3 m, 24.xi.2019, Hsing-Che Liu leg. KAOHSIUNG: 19 spec. ( NCHU): Dongsha Island (ǥàƀ), 20.708°N, 116.71654°E, 21–25.iv.2005, pitfall trap, leg. J.-F. Tsai, Z.-Y. Liu & B.-F. Chen (DE03) [specimens NCHU 0007-1823 to NCHU 0007-1831]; 2 spec. ( NCHU): Dongsha Island (ǥàƀ), 20.708°N, 116.71654°E, 21–25.iv.2005, pitfall trap, leg. J.-F. Tsai, Z.-Y. Liu & B.-F. Chen (DE02) [specimens NCHU 0007-1832 and NCHU 0007-1833]; 5 spec. ( NCHU):Dongsha Island (ǥàƀ), 20.708°N, 116.716540°E, 26.iv.2005, DE sample plot, leg. J.-F. Tsai, Z.-Y. Liu & B.-F. Chen, [specimens NCHU 0007-1834 to NCHU 0007-1838]; 7 spec. ( NCHU):Dongsha Island (ǥàƀ), 20.708°N, 116.716540°E, 26.iv.2005, DE sample plot, marsh, leg. J.-F. Tsai, Z.-Y. Liu & B.-F. Chen [specimens NCHU 0007-1839 to NCHU 0007-1845].

Diagnosis. Body size 4.1–4.5 mm, body width 2.7–2.9 mm. Body oval. Labrum black with yellow edges, its front margin emarginate. Elytral surface densely punctate, without traces of series, sutural stria reaching basal half of elytra. Mesofemora with strong setae, but without dense pubescence. Abdominal ventrite V with row of stout setae situated in apical emargination.

Male genitalia ( Fig. 2E View Fig ): aedeagus 1.0– 1.1 mm long. median lobe shorter than parameres, almost of the same width from base to apex, only slightly widened at the very base, apex subangulate; gonopore small, situated apically; parameres bent inwards in apical third, truncate apically. Differential diagnosis. This species is very similar to C. stultum , it can be distinguished from it by median lobe almost parallel-sided and slightly spoon-like, not distinctly widened basally.

Comments. It seems that this species was confused with C. stultum by previous authors. The concept of C. bhutanicum and C. stultum adopted here is based on the study of material from the Indian subcontinent (including the types of C. stultum from Sri Lanka) prepared as part of a study of the Indian Coelostoma by S. Sheth, H. Ghate and M. Fikáček and will be explained and justified in detail there.

Bionomics. Specimens from Changhua and Taichung were collected among plant roots around a pond and in the mud on the river shore.All specimens from Donsha Island ( Fig. 3A View Fig ) were collected by a pitfall trap which was set near a seasonal marsh.

Distribution. This species is so far only known from the Himalayas ( India, Nepal and Bhutan) (FIKÁČEK et al. 2015). First record for Taiwan ( Fig. 4 View Fig ).