Gyrinidae

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: 114

publication ID

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

publication LSID

lsid:zoobank.org:pub:C7DFE939-E932-4570-8496-7A67A51D4D7A

DOI

http://doi.org/10.5281/zenodo.5817474

persistent identifier

http://treatment.plazi.org/id/03DC697B-FF98-FFCF-77CA-FC87FA37F8F7

treatment provided by

Plazi

scientific name

Gyrinidae
status

 

Key to the tribes and genera of adult Gyrinidae   in Thailand,

including species of adult Gyrinini   and Dineutini  

1 Dorsal surface of pronotum and elytron with pubescence; abdominal sternite VIII narrow and long....... Orectochilini   , 2

- Dorsal surface of pronotum and elytron completely glabrous ( Figs. 1A–H View FIGURE 1 ); abdominal sternite VIII broad and short....... 3

2 Antenna with six flagellomeres; surface of pronotum and elytron with glabrous regions medially and pubescence marginally............................................................................................... Patrus  

- Antenna with nine flagellomeres; surface of pronotum and elytron without glabrous regions, entirely covered with pubescence.................................................................................... Orectochilus  

3 Size smaller, length <6.0 mm; pronotum with median transverse depression; scutellum visible; elytron with 11 longitudinal striae ( Figs. 1A–B View FIGURE 1 , 2A–B View FIGURE 2 ).............................................................. Gyrinini   , Gyrinus   , 4

- Size larger, length 6.0–17.0 mm; pronotum without median transverse depression; scutellum not visible ( Figs. 1C–H View FIGURE 1 ); elytron without evident longitudinal striae.............................................................. Dineutini   , 5

4 Dorsally metallic in appearance lateral sides of elytra with bronzy sheen ( Fig. 1A View FIGURE 1 ), intervals VI–X not sulcate............................................................................................ Gyrinus sericeolimbatus  

- Dorsally iridescent in appearance ( Fig. 1B View FIGURE 1 ); lateral sides of elytra without bronzy sheen, intervals VI–X strongly sulcate ( Fig. 2B View FIGURE 2 )............................................................................... Gyrinus smaragdinus  

5 Labrum short and broad, not triangular in form ( Figs. 1C–G View FIGURE 1 ); apex of protibia without spine................ Dineutus   , 6

- Labrum long and triangular in form ( Fig. 1H View FIGURE 1 ); apex of protibia with spine ( Fig. 1H View FIGURE 1 )......... Porrorhynchus marginatus  

6 Size smaller, length 6.0– 8.2 mm; profemur of males without sub-apicoventral tooth; protibia wedge-shaped; elytral apices variously shaped........................................................................................ 7

- Size larger, length 13.4–17.0 mm; profemur of males with sub-apicoventral tooth; protibia club-shaped; elytral apices rounded ( Figs. 1E View FIGURE 1 , 5F View FIGURE 5 ).................................................................................. D. sitesi  

7 Apex of flagellomere VI darkly colored; elytral apices without parasutural spines; lateral margin of pronotum and elytron black.............................................................................................. 8

- Apex of flagellomere VI lightly colored; elytral apices with parasutural spines ( Figs. 1F View FIGURE 1 , 5J View FIGURE 5 ); lateral margin of pronotum and elytron orange or yellow...................................................................... D. spinosus  

8 Size smaller, length 6.0– 6.9 mm; body form narrowly oval; elytral apices with epipleural spines ( Figs. 1G View FIGURE 1 , 6A View FIGURE 6 ) evident in both sexes; elytral apex truncate and straight ( Figs. 1G View FIGURE 1 , 6A View FIGURE 6 ); protrochanter of male apically without patch of thick setae on ventral surface ( Fig. 4D View FIGURE 4 )......................................................................... D. unidentatus  

- Size larger, length 7.6–8.2 mm; body form oval; elytral apices of male only with epipleural spines ( Figs. 1C View FIGURE 1 , 5A View FIGURE 5 ), female without epipleural spines ( Figs. 1D View FIGURE 1 , 5B View FIGURE 5 ); elytral apex obliquely truncate ( Figs. 1C–D View FIGURE 1 , 5A–B View FIGURE 5 ); protrochanter of male apically with patch of thick setae on ventral surface ( Fig. 4A View FIGURE 4 ).................................................... D. australis