Patrus landaisi, Regimbart, 1892

Suksai, Benjamart, Gustafson, Grey T., Sites, Robert W. & Sangpradub, Narumon, 2021, Review of the Patrus landaisi species group from Thailand with description of three new species (Coleoptera, Gyrinidae), Zootaxa 4991 (3), pp. 561-591 : 587-588

publication ID	https://doi.org/ 10.11646/zootaxa.4991.3.8
publication LSID	lsid:zoobank.org:pub:F0FAE07E-4A90-4602-BCC5-6D80E158BB6C
persistent identifier	https://treatment.plazi.org/id/03BC87C1-FFF0-2250-0CC0-7970FA43513A
treatment provided by	Plazi
scientific name	Patrus landaisi
status

Treatment

Key to species of adult Patrus landaisi group within Thailand

1. Protarsus laterally expanded, with setose pad on posterior face.......................................... 2 (males)

- Protarsus narrow, not laterally expanded, without setose pad on posterior face............................ 9 (females)

2. Elytral glabrous region along suture extending ca. 7/9 length of elytra; elytral apex without apicolateral sinuation; species found at elevations higher than 450 m a.s.l...................................................................... 3

- Elytral glabrous region along suture extending ca. 6/7 length of elytra; elytral apex with apicolateral sinuation ( Fig. 6A, C View FIGURE 6 ); species found at elevations lower than 450 m a.s.l.............................. Patrus corpulentus ( Régimbart, 1884)

3. Protibia constricted basally, appearing hatchet-shaped ( Fig. 4F–G View FIGURE 4 ).............................................. 4

- Protibia not constricted basally, appearing either wedge- or club-shaped ( Fig. 4A–E, H View FIGURE 4 )............................. 5

4. Elytral apex weakly rounded in appearance, epipleural angle indistinct; elytral glabrous region laterally expanded in anterior 2/3 to nearly same width as pronotal glabrous region ( Fig. 11A View FIGURE 11 ); protibia constricted in basal 1/2 ( Fig. 4G View FIGURE 4 ); median lobe of aedeagus constricted medially ( Fig. 11B View FIGURE 11 )........................................... Patrus salvazai ( Ochs, 1940)

- Elytral apex obliquely truncate, epipleural angle distinct; elytral glabrous region laterally expanded in anterior 2/3 to wider than pronotal glabrous region ( Fig. 10A View FIGURE 10 ); protibia constricted in basal 2/5 ( Fig. 4F View FIGURE 4 ); median lobe of aedeagus without medial constriction ( Fig. 10B View FIGURE 10 )....................................................... Patrus phetchabunensis sp. nov.

5. Elytral apex rounded, epipleural angle indistinct ( Fig. 7A View FIGURE 7 ); body form in lateral view strongly dorsoventrally convex........................................................................................ Patrus garuda sp. nov.

- Elytral apex obliquely truncate, epipleural angle distinct ( Figs. 5A View FIGURE 5 , 8A View FIGURE 8 , 9A View FIGURE 9 , 12A View FIGURE 12 ); body form in lateral view weakly dorsoventrally convex............................................................................................. 6

6. Protibia club-shaped ( Fig. 4D View FIGURE 4 ); median lobe of aedeagus without strongly constricted apex ( Fig. 8B View FIGURE 8 )........................................................................................... Patrus landaisi ( Régimbart, 1892)

- Protibia wedge-shaped ( Fig. 4A, E, H View FIGURE 4 ); median lobe of aedeagus with strongly constricted apex...................... 7

7. Protarsus ca. 1/2 the length of the protibia, protarsomeres width gradually decreasing apically ( Fig. 4E View FIGURE 4 ); median lobe of aedeagus with needle-like apex ( Fig. 9B View FIGURE 9 ).............................................. Patrus nanensis sp. nov.

- Protarsus> 1/2 length of protibia, protarsomeres width not gradually decreasing apically ( Fig. 4A, H View FIGURE 4 ); median lobe of aedeagus with or without needle-like apex......................................................................... 8

8. Mesoventrite with median pit; median lobe of aedeagus with needle-like apex ( Fig. 5B View FIGURE 5 ).. Patrus apicalis ( Régimbart, 1891)

- Mesoventrite without median pit; median lobe of aedeagus without needle-like apex, apex triangular ( Fig. 12B View FIGURE 12 )............................................................................ Patrus subapicalis ( Ochs, 1930) stat. nov.

9. Elytral glabrous region along suture extending ca. 7/9 length of elytra, lateral pubescence convex posteriorly towards suture in association with medial acumination of glabrous region; elytral apex without apicolateral sinuation ( Fig. 3A, C–H View FIGURE 3 ). Found at elevations higher than 450 meters....................................................................... 10

- Elytral glabrous region along suture extending ca. 6/7 length of elytra, lateral pubescence without convex posterior region extending towards suture, instead concave throughout ( Fig. 3B View FIGURE 3 ); elytral apex with apicolateral sinuation. Found at elevations lower than 450 m a.s.l.................................................... Patrus corpulentus ( Régimbart, 1884)

10. Elytral glabrous region cordiform ( Fig. 3F–G View FIGURE 3 )............................................................. 11

- Elytral glabrous region not cordiform ( Fig. 3A, C–E, H View FIGURE 3 )..................................................... 12

11. Elytral apex weakly rounded in appearance, epipleural angle indistinct ( Fig. 11E View FIGURE 11 )............ Patrus salvazai ( Ochs, 1940)

- Elytral apex obliquely truncate, epipleural angle distinct, weakly rounded ( Fig. 10E View FIGURE 10 )..... Patrus phetchabunensis sp. nov.

12. Elytral apex rounded, epiplural angle indistinct, elytral glabrous region “nycteriform” (batwing-shaped) ( Fig. 3C View FIGURE 3 ); reproductive tract with additional sclerotized structure between gonocoxae ( Fig. 7F View FIGURE 7 )........................ Patrus garuda sp. nov.

- Elytral apex obliquely truncate, epiplural angle distinct, reproductive tract without additional sclerotized structure between gonocoxae......................................................................................... 13

13. Elytral glabrous region with posterolateral corners produced into points ( Fig. 3A, E, H View FIGURE 3 )............................ 14

- Elytral glabrous region with posterolateral corners squared-off, not produced posteriorly ( Fig. 3D View FIGURE 3 )............................................................................................. Patrus landaisi ( Régimbart, 1892)

14. Glabrous region of elytra narrower, occupying 9/11 elytral width; posterior lateral pubescence of elytra unevenly convex towards suture, extending obliquely with a subtruncate appearance ( Figs. 3E View FIGURE 3 , 9E View FIGURE 9 ).............. Patrus nanensis sp. nov.

- Glabrous region of elytra broader, occupying 10/11 elytral width; posterior margin of elytral glabrous region evenly convex towards suture ( Fig. 3A, H View FIGURE 3 )............................................................................ 15

15. In lateral view, width of elytral pubescent margin at the humeral region nearly equal to that extending posterior; in dorsal view, lateral margin of elytral glabrous region more arcuate in appearance ( Fig. 5E View FIGURE 5 ).......... Patrus apicalis ( Régimbart, 1891)

- In lateral view, width of elytral pubescent margin at the humeral region twice that extending posterior; in dorsal view, lateral margin of elytral glabrous region less arcuate in appearance ( Fig. 12E View FIGURE 12 )........ Patrus subapicalis ( Ochs, 1930) stat. nov.