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
Regimbart, 1891
Regimbart
1891
[151,629,1554,1582]
Insecta
Gyrinidae
Gyrinus
Animalia
Coleoptera
2
99
Arthropoda
species
smaragdinus
( Figs. 1B, 2, 3C–E, 7A–B, 8A)
Material examined. THAILAND: Chiang Mai Province: Doi Inthanon Natl. Park, Mae Klangat Ban Khun Klang, 18°31.259'N 98°31.310'E, 1296 ma.s.l., 18.V.2004, leg. T. Prommi, A. Vitheepradit, P. Laudee& P. Thamasenanupap, L-694, 3 males, 9 females( UMC); same locality except for, Pha Dum Waterfall, 18°36'N 98°31'E, 1379 ma.s.l., 3.V.2003, leg. UMC & CMU teams, L-499, 3 males, 2 females( UMC); same locality except for, Siriphum Waterfall(lowest level), 18°32'N 98°31'E, 1460 ma.s.l., 21.III.2002, leg. R.W. Sites, A. Vitheepradit& K. Kirawanich, L-315, 4 males, 3 females( UMC); same locality except for, 9.V.2002, leg. UMC & CMU teams, L-401, 3 males( UMC); same locality except for, stream from Huai Sai Luang Waterfall, 18°31'N 98°27'E, 1060 ma.s.l., 8.V.2002, leg. UMC & CMU teams, L-396, 27 males, 27 females( UMC); Doi Suthep Natl. Park, Monthathan Waterfall, 18°49'N 98°55'E, 700 ma.s.l., 11.I.2003, leg. CMU Team, 1 male( UMC); same locality except for, 14.II.2003, leg. CMU Team, 1 male( UMC); Pondat Ban Buak Thoei, Pong Yaeng Subdistrict, Mae Rim District, 18°53'30.2"N 98°47'36.5"E, 1153 ma.s.l., 29.IV.2018, leg. B. Suksai, S. Kullasoot, C. Yatfung& P. Sapewisut, 2 males, 1 female( THNHM). 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, 2 males( KKU, THNHM), 1 female( THNHM). Loei Province: Phu Hin Rongkla Natl. Park, Man Daeng Noiat trail, 16°57'N 101°03'E, 1600 ma.s.l., 5.V.2003, leg. N. Changthong, 20 males, 18 females( UMC); same locality except for, 1340 ma.s.l., 6.V.2003, leg. A. Vitheepradit, T. Prommi& M.L. Ferro, L-504, 10 males, 16 females( UMC); Phu Kradueng Natl. Park, stream from Tham Yai Waterfall, Si Than Subdistrict, Phu Kradueng District, 16°52'59.9"N 101°46'46.4"E, 1197 ma.s.l., 7.XII.2010, leg. N. Sangpradub, 1 female( KKU); same locality except for, Tham Sor Nuo Waterfall, Si Than Subdistrict, Phu Kradueng District, 16°52'36.2"N 101°44'48.2"E, 1234 ma.s.l., 8.III.2011, leg. N. Sangpradub, 1 male, 1 female( THNHM); same locality except for, Wang Kwang Waterfall, Si Than Subdistrict, Phu Kradueng District, 16°53'29.5"N 101°47'03.5"E, 1221 ma.s.l., 6.III.2011, leg. N. Sangpradub, 2 females( KKU). Nan Province: Doi Phuka Natl. Park, Ton Thong Waterfall, 19°12'N 101°04'E, 900 ma.s.l., 21.IV.2003, leg. A. Vitheepradit, T. Prommi& K. Setaphan, L-472, 4 males, 1 female( UMC); stream at Khun Sathan Natl. Park, Ban Mueng Li, Mueng Li Subdistrict, Na Muen District, 18°15'08.4"N 100°29'35.8"E, 786 ma.s.l., 29.V.2017, leg. P. Sapewisut, 1 male, 1 female( THNHM). Phitsanulok Province: Phu Hin Rongkla Natl. Park, stream btw Rd2113 and Man Daeng Waterfall, 12.VI.1998, leg. R.W. Sites& K.B. Simpson, L-187, 22 males, 17 females( UMC); same locality except for, Waterwheel fallsand stream, 16°59'N 101°00'E, 1280 ma.s.l., 10.II.2003, leg. CMU Team, 6 males, 4 females( UMC); same locality except for, 6.V.2003, leg. A. Vitheepradit, T. Prommi& M.L. Ferro, L-506, 2 males, 3 females( UMC); same locality except for, 12.VII.2003, leg. N. Changthong, 1 male, 3 females( 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, 1 male, 1 female( KKU).
Diagnosis.Male ( Fig. 1B): Size: 4.0–5.0 mm. Body form oval, strongly convex in lateral view; pronotum and elytral margins darkly colored, pronotum with median transverse depression ( Fig. 2A), dorsal surface strongly iridescent, without evident microreticulation; pronotum and elytra laterally without bronzy-metallic sheen; striae I–XI evident with distinct, widely spaced punctures, striae VI–X strongly sulcate ( Fig. 2B); elytral intervals VII–X convex; elytral apex truncate ( Figs. 1B, 2B–C), without border ( Fig. 2C), epipleural angle indistinct; metaepisternal ostiole small; aedeagus with median lobe slightly shorter than parameres, apical half of median lobe broader in width than single paramere, apex weakly triangular, lateral margin of parameres weakly curved, apex rounded ( Figs. 3C–D). Female: Similar to male but with a more oval body form; gonocoxae as in Fig. 3E. FIGURE 3.Aedeagus and gonocoxae: (A–B) Gyrinus sericeolimbatus: (A) aedeagus, dorsal view (after Svensson 1991; Mazzoldi 2010); (B) gonocoxae, ventral view, scale bars = 0.5 mm; (C–E) Gyrinus smaragdinus: (C–D) aedeagus, scale bars = 0.5 mm: (C) dorsal view; (D) lateral view; (E) gonocoxae, ventral view, scale bars = 0.5 mm. Differential diagnosis.Among the Old World Gyrinus, G. smaragdinusis closest to G. ignitus Régimbart, 1895, a Malagasy endemic species. The only other species of Gyrinusrecorded from Thailandis G. sericeolimbatus. G. smaragdinuscan be distinguished from G. sericeolimbatusby its iridescent appearance and strongly sulcate lateral elytral setriae.
Distribution.This species is known from northeastern India, to Myanmar, Yunnan Provinceof southern China, and northern Vietnam( Ochs 1930; Vazirani 1972, 1984; Mazzoldi 1995). It is here recorded for the first time in Thailand. Habitat.We found G. smaragdinusmost often on stagnant water of montane streams and ponds at high elevation, ranging from 700 to 1600 ma.s.l. ( Figs. 7A–B). Only a few specimens were found in a stream at a low elevation ( 270 ma.s.l.).
Discussion. G. smaragdinusis the only species of Gyrinusthat we encountered during our sampling in the northern, western and northeastern regions of Thailand( Fig. 8A). The first author found this beetle in a pond surrounded by land with both agricultural use and intact forest.
3411799373
2004-05-18
UMC
T. Prommi & A. Vitheepradit & P. Laudee & P. Thamasenanupap
Thailand
Doi Inthanon Natl. Park
1296
18.520983
Ban Khun Klang
1
98.521835
Mae Klang
2
99
12
9
3
Chiang Mai
3411799397
2003-05-03
UMC & CMU team
Thailand
Doi Inthanon Natl. Park
1379
18.6
Pha Dum Waterfall
1275
98.51667
Mae Klang
2
99
5
2
3
Chiang Mai
3411799309
2002-03-21
UMC
R. W. Sites & A. Vitheepradit & K. Kirawanich
Thailand
Doi Inthanon Natl. Park
1460
18.533333
Siriphum Waterfall
1275
98.51667
Mae Klang
2
99
7
3
4
Chiang Mai
3411799451
2002-05-09
UMC & CMU teams
Thailand
Doi Inthanon Natl. Park
1460
18.533333
Siriphum Waterfall
1275
98.51667
Mae Klang
2
99
3
3
Chiang Mai
3411799384
2002-05-08
UMC & CMU teams
Thailand
Doi Inthanon Natl. Park
1060
18.516666
Huai Sai Luang Waterfall
1275
98.45
Mae Klang
2
99
54
27
27
Chiang Mai
3411799374
2003-01-11
UMC
Team
Thailand
700
18.816668
Monthathan Waterfall
1274
98.916664
Doi Suthep Natl. Park
2
99
1
1
Chiang Mai
3411799341
2003-02-14
UMC
Team
Thailand
700
18.816668
Monthathan Waterfall
1274
98.916664
Doi Suthep Natl. Park
2
99
1
1
Chiang Mai
3411799434
2018-04-29
THNHM
B. Suksai & S. Kullasoot & C. Yatfung & P. Sapewisut
Thailand
Pond
1153
4
101
18.891722
Pong Yaeng Subdistrict
1
98.79347
Ban Buak Thoei
2
99
3
1
2
Chiang Mai
3411799339
2002-02-25
KKU, THNHM
S. Saeheag
Thailand
Thong Pha Phum Natl. Park
270
14.555
Hin Dat Subdistrict
1
98.597725
Huay Ka Yeang Stream
4
101
2
2
Kanchanaburi
3411799366
[431,658,1301,1327]
2002-02-25
THNHM
S. Saeheag
Thailand
Thong Pha Phum Natl. Park
270
true
14.555
Hin Dat Subdistrict
1
98.597725
Huay Ka Yeang Stream
4
101
1
1
Kanchanaburi
3411799453
2003-05-05
UMC
N. Changthong
Thailand
1600
16.95
Man Daeng Noi
1280
101.05
Phu Hin Rongkla Natl. Park
4
101
38
18
20
Loei
3411799405
2003-05-06
UMC
A. Vitheepradit & T. Prommi & M. L. Ferro
Thailand
1340
16.95
Man Daeng Noi
1280
101.05
Phu Hin Rongkla Natl. Park
4
101
26
16
10
Loei
3411799359
2010-12-07
KKU
N. Sangpradub
Thailand
Phu Kradueng Natl. Park
1197
16.883307
Si Than Subdistrict
1
101.77956
Tham Yai Waterfall
4
101
1
1
Loei
3411799415
2011-03-08
THNHM
N. Sangpradub
Thailand
Tham Sor Nuo Waterfall
1234
16.876722
Phu Kradueng District
1
101.74672
Si Than Subdistrict
4
101
2
1
1
Loei
3411799331
2011-03-06
KKU
N. Sangpradub
Thailand
Wang Kwang Waterfall
1221
16.891527
Phu Kradueng District
1
101.7843
Si Than Subdistrict
4
101
2
2
Loei
3411799327
2003-04-21
UMC
A. Vitheepradit & T. Prommi & K. Setaphan
Thailand
900
19.2
Ton Thong Waterfall
1273
101.066666
Doi Phuka Natl. Park
4
101
5
1
4
Nan
3411799304
2017-05-29
THNHM
P. Sapewisut
Thailand
Khun Sathan Natl. Park
786
18.252333
Mueng Li Subdistrict
1
100.49327
Ban Mueng Li
4
101
2
1
1
Nan
3411799362
1998-06-12
UMC
R. W. Sites & K. B. Simpson
Thailand
Phu Hin Rongkla Natl. Park
Man Daeng Waterfall
Rd
4
101
39
17
22
Phitsanulok
3411799382
2003-02-10
UMC
Team
Thailand
Phu Hin Rongkla Natl. Park
1280
16.983334
Waterwheel falls
1280
101.0
Rd
4
101
10
4
6
Phitsanulok
3411799311
2003-05-06
UMC
A. Vitheepradit & T. Prommi & M. L. Ferro
Thailand
Phu Hin Rongkla Natl. Park
1280
16.983334
Waterwheel falls
1280
101.0
Rd
4
101
5
3
2
Phitsanulok
3411799303
[467,1432,1841,1868]
2003-07-12
UMC
N. Changthong
Thailand
Phu Hin Rongkla Natl. Park
1280
16.983334
Waterwheel falls
1280
101.0
Rd
4
101
4
3
1
Phitsanulok
3411799442
2011-03-23
KKU
N. Sangpradub
Thailand
Thung Salaeng Luang Natl. Park
894
16.485416
Ban Mung Subdistrict
1
100.80867
Tum Din Stream
4
101
2
1
1
Phitsanulok