Dineutus sitesi Gustafson, Hajek & Miller 2016
Creators: name: Suksai, Benjamart
name: Gustafson, Grey T.
name: Sites, Robert W.
name: Sangpradub, Narumon
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Gyrinidae
Dineutus
Dineutus sitesi

description: Dineutus sitesi Gustafson, Hájek & Miller, 2016
(Figs. 1E, 1I, 4B, 5F–I, 7D, 8A)
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). 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); 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); same locality except for, 15.XI.2002, leg. CMU Team, 3 males (UMC, THNHM), 2 females (UMC); same locality except for, 5.V.2003, leg. N. Changthong, 1 male (UMC); 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).
Diagnosis. Male (Fig. 1E): 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), elytral apex rounded (Fig. 1E); lateral margin of pronotum and elytron darkly colored, black; protrochanter apically without setae on ventral surface (Fig. 4B); profemur with sub-apicoventral tooth; protibia club-shaped; venter reddish to brown (Fig. 1I); epipleura reddish to black (Fig. 1I); aedeagus (Figs. 5G–H) 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).
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) (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). 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.
description: Published as part of 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, pp. 97-117 in Zootaxa 5071 (1) on pages 104-106, DOI: 10.11646/zootaxa.5071.1.5, http://zenodo.org/record/5723327