Diognetus species

Yasunaga, Tomohide, Schwartz, Michael D. & Chérot, Frédéric, 2023, Revision of the plant bug genus Diognetus, with descriptions of thirteen new species from the Oriental and Eastern Palearctic Regions (Hemiptera: Heteroptera: Miridae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 63 (1), pp. 1-55 : 5

Key to Diognetus species (males)

1 Sensory lobe of left paramere globally triangular or rounded ( Figs 8I , 11B− C , 12G , 18A , 20A , 23I ). ...... 2

– Sensory lobe of left paramere obviously squared ( Figs 8C, 8K , 12A, D , 15L , 20D , 21D ). ............................ 7

2 Right lobal sclerite of vesica spinulate or toothed ( Fig. 8J ). ............................................................................ 3

– Right lobal sclerite of vesica neither spinulate nor toothed ( Fig. 8G ). ..................................................... 5

3 Right lobal sclerite of vesica fully sclerotized, curved and toothed subapically, pointed apically, spicule-like ( Fig. 11D ); median lobal sclerite and left lobal-sclerite obviously longer. Japan (Honshu). .............................. .................................. D. flavigenis ( Horváth, 1905)

– Shape of right lobal sclerite of vesica different ( Figs 12I and 20C ). ............................................................ 4

4 Right lobal sclerite of vesica partially membranous, with a small triangular process ( Fig. 12I ). Vesica devoid of horn-like sclerite. Labium long, usually exceeding apex of metacoxa, reaching abdominal sternum III or IV. Principally associated with Lauraceae broadleaf trees. Japan (Shikoku, Kyushu). ............ D. laureus sp. nov.

– Right lobal sclerite of vesica sclerotized but not spicule-like, its apex spinulate ( Fig. 20C ). Vesica with a horn-like sclerite. Labium relatively shorter, reaching but not exceeding apex of metacoxa. Associated with Trema sp. Nepal. ........................... D. puspae sp. nov.

5 Vesica devoid of elongate spicule-like sclerite arising basally to secondary gonopore ( Fig. 8J ). Nepal. ......... ................................................ D. dhampus sp. nov.

– Vesica with an elongate spicule-like sclerite arising basally to secondary gonopore ( Figs 18C− D and 21J ). 6

6 Small species (total length range between 3.5 and 3.8 mm in males). Indonesia (Sumatra), Malaysia (Perak). ....................................... D. minusculus sp. nov.

– Relatively large species (total length about 5 mm in males). Japan (Honshu, Shikoku, Kyushu). ................ .............................. D. yamato Yasunaga nom. nov.

7 Right lobal sclerite of vesica (RS) devoid of recognizable triangular process (TP) ( Figs 8D, 8F− G , 20F ). ............... 8

– Right lobal sclerite of vesica (RS) with a triangular process ( Figs 12F , 15E, N , 21F− G ), tiny in some species. ......... 11

8 Right lobal sclerite of vesica spinulate or toothed. Apex of left lobal sclerite pointed ( Fig. 8M ). Nepal. .. ............................................ D. duwalorum sp. nov.

– Right lobal sclerite of vesica neither spinulate nor toothed. ..................................................................... 9

9 Apex of left lobal sclerite spatulate or rounded. Apex of median lobal sclerite pointed ( Fig. 22F ); median lobal sclerite shorter than right and left lobal sclerite. Indonesia (Sumatra). ............ D. schuhorum sp. nov.

– Apex of left lobal sclerite pointed. ......................... 10

10 Left lobal sclerite of vesica about as long as right lobal sclerite ( Figs 8D ). Nepal. ..... D. bagmaticus sp. nov.

– Left lobal sclerite of vesica longer than right lobal sclerite ( Figs 8G ). Japan (Honshu, Shikoku, Kyushu). ........................................... D. cheimon sp. nov.

11 Apex of left lobal sclerite of vesica spatulate to rounded. ................................................................. 12

– Apex of left lobal sclerite of vesica pointed. .......... 15

12 Left lobal sclerite of vesica longer than right lobal sclerite ( Figs 12F , 15I–J ). ............................................. 13

– Left lobal sclerite of vesica almost as long as than right lobal sclerite ( Figs 21C, F ). .................................... 14

13 Right lobal sclerite spinulate, median lobal sclerite the shortest ( Figs 15I–J ). India (Tamil Nadu), Sri Lanka, Thailand. ........................... D. intonsus Distant, 1904

– Right lobal sclerite smooth, median lobal sclerite slightly longer than the right lobal sclerite ( Fig. 12F ). Labium about as long as or slightly longer than maximum body width (across hemelytra); currently known only from Japanese Ryukyus, Taiwan and Philippines. ................................ D. insulanus ( Yasunaga, 1994)

14 Labium reaching metacoxa, shorter than maximum body width; known from warm temperate zone (SW Honshu, Shikoku, Kyushu, Tsushima of Japan and Korean Jeju Island). .......................... D. vernus sp. nov.

– Labium reaching apex of mesocoxa. Taiwan (Nantou). ................................................ D. styrax sp. nov.

15 Left paramere with a conical process on its body inner margin ( Fig. 15L ). Indonesia (Sumatra). ..................... ............................................. D. magnificus sp. nov.

– Left paramere devoid of conical process on its body inner margin ( Fig. 12A ). Malaysia (Pahang). .............. ..................................................... D. gotohi sp. nov.

Figures

Fig. 8. Male genitalia of Diognetus bagmaticus sp. nov. (A−D), D.cheimon sp. nov.(E−G), D. dhampus sp. nov. (H−J) and D. duwalorum sp. nov.(K−M). A−B, E − apex of pygophore with parameres; C, H, L − right paramere; I, K − left paramere; D, F−G, J, M − vesica (endosoma). Scale bars 0.2 mm.

Fig. 11. Male (A–E) and female (F–I) genitalia of Diognetus flavigenis (Horváth, 1905).A − right paramere; B−C − left paramere; D−E − vesica (endosoma); F − ovipositor (gonapophysis I); G−H − genital chamber; I − posterior wall. Scale bars 0.1 mm.

Fig. 12. Male genitalia of Diognetus gotohi sp. nov. (A−C), D. insulanus (Yasunaga, 1994) (D−F) and D. laureus sp. nov. (G−I).A, D, G − left paramere; B, E, H − right paramere; C, F, I − vesica (endosoma). Scale bars 0.2 mm.

Fig. 18. Male (A–D) and female (E–G) genitalia of Diognetus minusculus sp. nov. A − left paramere and apex of pygophore; B − right paramere; C−D − vesica (endosoma); E − ovipositor (gonapophysis I); F − genital chamber; G − posterior wall. Scale bars 0.1 mm.

Fig. 20. Male genitalia of Diognetus puspae sp. nov. (A−C) and D. schuhorum sp. nov. (D−F).A, E − left paramere; B, E − right paramere; C, F − vesica (endosoma). Scale bars 0.2 mm.

Fig. 23. Dorsal vestiture pattern for 4 Japanese Diognetus species: D. cheimon sp. nov., D. insulanus (Yasunaga, 1994), D. laureus sp. nov and D. vernus sp. nov.

Fig. 15. Male genitalia of Diognetus insulanus (Yasunaga, 1994) (A−E), D. intonsus Distant, 1904 (F−J) and D. magnificus sp. nov. (K−N). A−B, F−G, K−L − left paramere; C, H, M − right paramere; D−E, I−J, N − vesica (endosoma). Scale bars 0.1 mm.

Fig. 21. Male genitalia of Diognetus styrax sp. nov. (A−C), D. vernus sp. nov. (D−G) and D. yamato nom. nov. (H−J). A, D, H − left paramere; B, E, I − right paramere; C, F−G, J − vesica (endosoma). Scale bars 0.2 mm.

Fig. 22. Female genitalia of Diognetus pilosus (Poppius, 1914) (A–B – 00419636 from Sumatra, C–D – from Malaysia), D. styrax sp. nov. (E−F), D. vernus sp. nov. (G−I) and D. yamato nom. nov.(J−L). A, C, H, K − genital chamber. B, D, E, G, J − posterior wall; F, I, L − ovipositor (gonapophysis I); Scale bars 0.1 mm.