Dineutus (Cyclous) unidentatus (Aubé)

Gupta, Devanshu, Sonali, Shipra, Wani, Irtiza, Ghosh, Priyanka, Ghosh, Asim Kumar & Ghosh, Sujit Kumar, 2025, A comprehensive taxonomic review of Indian Gyrinidae (Coleoptera): new combinations, geographic distribution, and annotated species checklist, Journal of Natural History 59 (17 - 20), pp. 1267-1338 : 1289-1293

Dineutus (Cyclous) unidentatus (Aubé)

( Figures 6 (c), 14(a))

Dineutus unidentatus Aubé, 1838, p. 788 ; Régimbart 1882a: 424, pl. 12, fig. 46; Séverin 1890: 194; Nowrojee 1912: 177, pl. 26, figs. 4–7; Peschet 1923: 4; Vazirani 1958: 16; Ochs 1966b: 179; De (Pal) and Sengupta 1993: 114; Biswas et al. 1997: 326; Dutta and Bhattacharya 2008: 182; Suksai et al. 2021: 108 .

Dineutus (Cyclous) unidentatus : Hájek and Fery, 2019: 3, 2022: 3; Jaiswal et al. 2023: 505, figs. 2C, F, J; Shankar et al. 2023: 456.

Dineutus (Gyrinodineutus) unidentatus : Ochs, 1926: 112, 1927b: 245, 1929b: 242, 245, 1929c: 401.

Dineutus (Spinosodineutus) unidentatus : Ochs, 1930: 12; Mouchamps 1949: 221, pl. 1, fig. 1, 2, 3; Vazirani 1977a: 251, 1977c: 291, 1984: 20, figs. 1B, 4, 14C, 32D, 34B, 44B; Biswas et al. 1995: 125; Mazzoldi 1995: 160; Mukhopadhyay et al. 2000: 81; Khan and Ghosh 2001: 65, fig. 30.

Type locality

Indes Orientales: Pondicherry ( Mouchamps 1949).

Material examined

INDIA: Arunachal Pradesh: West Kameng, Dirang Dzong , 27.34284°N, 92.271017°E, 1 ex ., 23 March 1973,leg .S .K.Tandon [25556/H4A]. Bihar: Bhagalpur, Khairpur , 25.32221°N, 86.97826°E, 1 ex ., 13 September 1915,leg . C . Paiva [984/H4]; Bhabua, Ramgarh , 25.29162°N, 83.65612°E, 11 exs ., 30 October 1928, leg . M . Sharif [9394–9404/H4]. Chhattisgarh: Surguja, Sankarghat , CHCAM 3425 , 23.2122832°N, 83.3196356°E, 1 exs ., 25 September 2012, leg . A . Raha and Party [30498/H4A]. Jharkhand: Dhanbad , 23.79617°N, 86.430354°E, 1 ex ., 15 October 1967, leg. T.G. Vazirani [5628/H4A]. Madhya Pradesh: Balaghat, Koilari , 21.66726°N, 79.610988°E, 1 ex ., 1 March 1927, leg . H .S. Pruthi [1003/H4]. Odisha: Koraput, Eastern Ghats , 18.50045°N, 83.000008°E, 2 exs ., 29 July 1929, leg . H .S. Pruthi [9384–9385/H4]. Rajasthan: Nagaur, Gudha , 26.96219°N, 75.123601°E, 4 exs ., 10 September 1958, leg . B . Biswas [2764–2767/H4A]. Tamil Nadu: Salem, Yercaud , 11.77479°N, 78.209705°E, 4 exs ., 15 June 1929, leg . H .S . Pruthi [9386–9389/H4]; Chennai , 13.00063°N, 80.228349°E, 4 exs ., 9 February 1962, I.N.M. and P.P. [2703–2706/H4A] – 1 ex., 1 .i .1962, leg. I.N.M. [2916/H4A] – 1 ex., 9 February 1962,leg.P.P.[3246/ H4A] – 1 ex., 9 February 1962, leg. P.P. [3917/H4A]. West Bengal: Kolkata , 22.56386°N, 88.346952°E, 1 ex ., 7 January 1926 [1001/H4] – 1 ex., 23 October 1927, leg . S .L. Hora [9370/H4]. Distribution in India ( Figure 14 (a))

Arunachal Pradesh ( West Kameng ), Andhra Pradesh (Relli Lake, Thatiudi Reservoir; Koundinya Wildlife Sanctuary: Kalyani Revu Waterfall), Bihar (Bhagalpur, Bhabua, Pusa, Purnia), Delhi (Okhla Reservoir), Jharkhand (Dhanbad, Konbir), Kerala (Thoothukudi ‘Tuticornin’), Madhya Pradesh (Balaghat: Koilari), Meghalaya (Shillong), Odisha (Gurguria, Balassore, Chilika Lake, Ganjam, Puri, Talcher, Angul; Shakti Waterfall, Koraput), Puducherry (Karaikal), Rajasthan (Ajmer), Tamil Nadu (Madurai, Tharangambadi ‘Tranquear’, Salem, Chennai), Uttarakhand, Uttar Pradesh (Lucknow), and West Bengal (Kolkata ‘Calcutta’, Berhampore. Darjeeling, Howrah, Murshidabad) .

Global distribution

Cambodia, Laos, China, India, Indonesia, Myanmar, Malaysia, Nepal, Pakistan, Sri Lanka, Thailand, and Vietnam.

Remarks

This is the first record of this species from Arunachal Pradesh.

Figures

Figure 6. Habitus (in dorsal view): (a) Dineutus (Cyclous) indicus indicus Aubé; (b) D. (C.) spinosus spinosus (Fabricius); (c) D. (C.) unidentatus (Aubé); (d) Aulonogyrus (Aulonogyrus) obliquus (Walker).

Figure 14. Map of India showing the distribution of Indian species of Gyrinidae: (a) Dineutus (Cyclous) indicus himalayensis, D. (Cyclous) unidentatus; (b) D. (Cyclous) indicus indicus; (c) D. (Cyclous) spinosus spinosus; (d) Aulonogyrus (Aulonogyrus) obliquus.