The Gyrinidae (Coleoptera) fauna of Thailand: Key to tribes and genera, with new records and keys to species of Dineutini and Gyrinini
Suksai, Benjamart
Gustafson, Grey T.
Sites, Robert W.
Sangpradub, Narumon
Zootaxa
2021
2021-11-22
5071
1
97
117
Gustafson, Hajek & Miller, 2016
Gustafson, Hajek & Miller
2016
[151,744,1789,1816]
Insecta
Gyrinidae
Dineutus
Animalia
Coleoptera
7
104
Arthropoda
species
sitesi
( 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 ma.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 ma.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 ma.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 ma.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 sitesican be distinguished from all other congeners in Thailandby 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 Thailandwhere 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. sitesiwas 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 ( PhetchabunMountains) at Thung Salaeng Luang National Park, Phitsanulok Provinceat an elevation of 894 ma.s.l. D. sitesiwas also collected from a stream in the Tenasserim Hills at Thong Pha Phum National Park, Kanchanaburi Provinceat an elevation of 270 ma.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.
3411799426
2002-02-25
NHMW
S. Saeheag
Thailand
Huay Ka Yeang Stream
270
14.555
Thong Pha Phum District
1
98.597725
Hin Dat Subdistrict
7
104
1
1
Kanchanaburi
3411799348
2002-03-10
UMC
R. Sites & Sites, A & K. Kirawanich
Thailand
1220
16.983334
Pool
1280
101.0
Huai Khamin Noi Waterfall
7
104
1
1
Phitsanulok
3411799398
[151,944,151,177]
2002-05-22
UMC
Team
8
105
1
1
3411799444
2003-07-12
THNHM
N. Changthong
1280
16.983334
Waterwheel Falls
1280
101.0
8
105
1
1
3411799430
2002-11-15
UMC, THNHM
Team
1280
16.983334
Waterwheel Falls
1280
101.0
8
105
3
3
3411799413
[790,990,223,249]
2002-11-15
UMC
Team
1280
true
16.983334
Waterwheel Falls
1280
101.0
8
105
2
2
3411799312
2003-05-05
UMC
N. Changthong
1280
true
16.983334
Waterwheel Falls
1280
101.0
8
105
1
1
3411799447
2011-03-23
KKU
N. Sangpradub
Noen Maprang District
894
16.485416
Thung Salaeng Luang Natl. Park
1
100.80867
Ban Mung Subdistrict
8
105
2
2