Dineutus sitesi Gustafson, Hájek & Miller, 2016

Suksai, Benjamart, Gustafson, Grey T., Sites, Robert W. & Sangpradub, Narumon, 2021, The Gyrinidae (Coleoptera) fauna of Thailand: Key to tribes and genera, with new records and keys to species of Dineutini and Gyrinini, Zootaxa 5071 (1), pp. 97-117 : 104-106

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https://doi.org/ 10.11646/zootaxa.5071.1.5

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Dineutus sitesi Gustafson, Hájek & Miller, 2016


Dineutus sitesi Gustafson, Hájek & Miller, 2016

( Figs. 1E, 1I View FIGURE 1 , 4B View FIGURE 4 , 5F–I View FIGURE 5 , 7D View FIGURE 7 , 8A View FIGURE 8 )

Material examined. THAILAND: Kanchanaburi Province: Thong Pha Phum Natl. Park, Huay Ka Yeang Stream, Hin Dat Subdistrict, Thong Pha Phum District , 14°33'18.0''N 98°35'51.8''E, 270 m a.s.l., 25.II.2002, leg. S. Saeheag, 1 male ( NHMW) GoogleMaps . Phitsanulok Province: Phu Hin Rongkla Natl. Park, Huai Khamin Noi Waterfall, Pool , 16°59'N 101°00'E, 1220 m a.s.l., 10.III.2002, leg. R. Sites, A. Vitheepradit & K. Kirawanich, 1 female ( UMC) GoogleMaps ; same locality except for, 22.V.2002, leg. CMU Team, 1 female ( UMC) ; same locality except for, Waterwheel Falls , 16°59'N 101°00'E, 1280 m a.s.l., 12.VII.2003, leg. N. Changthong, 1 female ( THNHM) GoogleMaps ; same locality except for, 15.XI.2002, leg. CMU Team, 3 males ( UMC, THNHM) GoogleMaps , 2 females ( UMC) GoogleMaps ; same locality except for, 5.V.2003, leg. N. Changthong, 1 male ( UMC) GoogleMaps ; Thung Salaeng Luang Natl. Park , Tum Din Stream , Ban Mung Subdistrict, Noen Maprang District, 16°29'07.5"N 100°48'31.2"E, 894 m a.s.l., 23.III.2011, leg. N. Sangpradub, 2 females ( KKU) GoogleMaps .

Diagnosis. Male ( Fig. 1E View FIGURE 1 ): Size: 15.0–17.0 mm. Body form broadly oval; apex of flagellomere VI darkly colored, black; elytral apices without parasutural spines, epipleural spines and serrations absent ( Fig. 5F View FIGURE 5 ), elytral apex rounded ( Fig. 1E View FIGURE 1 ); lateral margin of pronotum and elytron darkly colored, black; protrochanter apically without setae on ventral surface ( Fig. 4B View FIGURE 4 ); profemur with sub-apicoventral tooth; protibia club-shaped; venter reddish to brown ( Fig. 1I View FIGURE 1 ); epipleura reddish to black ( Fig. 1I View FIGURE 1 ); aedeagus ( Figs. 5G–H View FIGURE 5 ) with median lobe shorter than parameres, parallel-sided for 3/4 length, narrowed in apical 1/5, apex triangular, curved dorsally in lateral view.

Female: Similar to male except for size: 13.4–15.7 mm; apex of flagellomere VI lightly colored, orange; profemur without sub-apicoventral tooth; gonocoxae elongate, lateral margins slightly rounded and expanded, apex rounded ( Fig. 5I View FIGURE 5 ).

Differential diagnosis. Dineutus sitesi can be distinguished from all other congeners in Thailand by the broadly oval body form, large size, rounded elytral apex lacking spines and serrations, and males with a sub-apicoventral profemoral tooth.

Distribution. This species is known only from Thailand where it was described from Phu Hin Rongkla National Park, Phitsanulok Province (Gustafson et al. 2016).

Habitat. This species occurs in streams and pools beneath waterfalls ( Fig. 7D View FIGURE 7 ) (Gustafson et al. 2016).

Discussion. In this study, D. sitesi was found at the same localities in Phu Hin Rongkla National Park as previously reported by Gustafson et al. (2016). Additionally, we found this species in another stream within the same mountain range (Phetchabun Mountains) at Thung Salaeng Luang National Park, Phitsanulok Province at an elevation of 894 m a.s.l. D. sitesi was also collected from a stream in the Tenasserim Hills at Thong Pha Phum National Park, Kanchanaburi Province at an elevation of 270 m a.s.l. ( Fig. 8A View FIGURE 8 ). Thus, more collecting in the northern and western regions where the mountain ranges approach continuity will be required further in order to better understand its distribution.


Naturhistorisches Museum, Wien


Herbarium, Department of Biology, Khon Kaen University













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