Machaerotypus Uhler, 1896

Li, Feng-E., Yang, Lin, Long, Jian-Kun, Chang, Zhi-Min & Chen, Xiang-Sheng, 2022, Two new species of the treehopper genus Machaerotypus Uhler, 1896 from China (Hemiptera: Membracidae: Centrotinae), European Journal of Taxonomy 826 (1), pp. 64-79 : 65-67

Genus Machaerotypus Uhler, 1896

Figs 1–6 , 8

Machaerotypus Uhler, 1896: 30 .

Machaerotypus – Goding 1931: 303. — Kato 1940: 147. — Funkhouser 1950: 207. — Metcalf & Wade 1965: 416. — Chou & Yuan 1981: 103. — McKamey 1998: 70. — Yuan & Chou 1988: 72; 2002: 254.

Type species

Machaerotypus sellatus Uhler, 1896 = M. sibirica (Lethierry, 1896) .

Diagnosis

Body usually with bright red markings. Head with vertex slightly to strongly arcuate dorsally, ventral margins oblique. Ocelli ovoid, closer to inner margin of eyes than to each other. Suprahumeral horns rounded, each with crescent-shaped ridge, not extended laterad of humeral angles. Posterior pronotal process mostly concealing scutellum, depressed at base, flat or with slight bulge in center. Humeral angle triangular and stout. Callosity smooth or slightly bristly. Scutellum exposed on both sides and at apex. Forewing multi-striped or hyaline, base with opaque sclerotization. Metathoracic tibia with three longitudinal rows of cucullate setae, trochanter without teeth.

Remarks

Compared with Yuan & Chou’s (2002) record, pronotum characteristics of four species, M. subinermis , M. ishiharai , M. stigmosus Li & Chen sp.nov., and M. nodulus Li & Chen sp.nov., were supplemented, and the key to species of Machaerotypus was updated based on Yuan & Chou (2002).

Host plant

Unknown.

Distribution

China, Japan, Russia, Korea ( Fig. 7 ).

Checklist of species of Machaerotypus Uhler, 1896

M. arisanus ( Kato, 1928) ; Japan, China (Taiwan).

M. camelliae Chou & Yuan, 1981 ; China (Yunnan).

M. ishiharai Kato, 1940 ; Japan (Honshu).

M. mali Chou & Yuan, 1981 ; China (Shaanxi).

M. nodulus Li & Chen sp. nov.; China (Guizhou).

M. rubromarginatus Kato, 1940 ; China (Shaanxi, Liaoning).

M. rubronigris Funkhouser, 1938 ; China (Zhejiang, Gansu).

M. semirubronigris Yuan & Chou, 1992 ; China (Sichuan).

M. sibiricus (Lethierry, 1876) ; Russia; Korea; Japan; China (Heilongjiang, Beijing, Shanxi, Shaanxi, Sichuan).

M. stigmosus Li & Chen sp. nov.; China (Guizhou).

M. subinermis Lindberg, 1927 ; Russia; Korea; China (Gansu, Heilongjiang).

M. taibaiensis Yuan, 2002 ; China (Shaanxi).

M. yananensis Chou & Yuan, 1981 ; China (Shaanxi).

Key to species of Machaerotypus Uhler, 1896 (based on Chou & Yuan 2002)

1. Body or pronotum with obviously reddish markings ....................................................................... 2

– Body dark or brown .......................................................................................................................... 8

2. Reddish markings on pronotum trident shaped ( Fig. 8A, a ) ......... M. camelliae Chou & Yuan, 1981

– Reddish markings on pronotum non-trident shaped ......................................................................... 3

3. Half of suprahumeral horn reddish ( Fig. 8D, d ) ................ M. semirubronigris Yuan & Chou, 1992

– Suprahumeral horn entirely reddish .................................................................................................. 4

4. Posterior pronotal process with one reddish band ( Fig. 8B, b ) .... M. rubronigris Funkhouser, 1938

– Reddish markings on posterior pronotal process more extensive, Y-shaped .................................... 5

5. Anterior parts of reddish Y-shaped pronotal marking enlarged ( Fig. 8G, g ) ...................................... ................................................................................................................ M. mali Chou & Yuan, 1981

– Anterior parts of reddish Y-shaped marking narrow ......................................................................... 6

6. Posterior pronotal process almost entirely reddish ( Fig. 8C, c ) ..... M. rubromarginatus Kato, 1940

– Center of posterior pronotal process in dorsal view brown or black ................................................ 7

7. Forewing with a hyaline transverse band near center ............................... M. taibaiensis Yuan, 2002

– Forewing brown and slightly shallow edge ................................ M. yananensis Chou & Yuan, 1981

8. Forewing veins with small nodules .................................................................................................. 9

– Forewing veins without nodules ..................................................................................................... 10

9. Posterior pronotal process flat ( Fig. 8J ) ............................................. M. subinermis Lindberg, 1927

– Posterior pronotal process with dorsal margin arched ( Fig. 8M ) ...... M. nodulus Li & Chen sp. nov.

10. The apex of posterior pronotal process curved ( Fig. 8L ) .......................... M. arisanus ( Kato, 1928)

– The apex of posterior pronotal process flat ......................................................................................11

11. Posterior pronotal process with two depressions ( Fig. 8I ) .......................... M. ishiharai Kato, 1940

– Posterior pronotal process with one depression .............................................................................. 12

12. Posterior pronotal process flat or slightly expanded ( Fig. 8K ) ............ M. sibiricus (Lethierry, 1876)

– Posterior pronotal process obviously expanded in lateral view ( Fig. 8H ) .......................................... ........................................................................................................ M. stigmosus Li & Chen sp. nov.

Figures

Fig. 1. Machaerotypus stigmosus Li & Chen sp. nov. A, C, E. Paratype, ♀ (IEGU), habitus in dorsal, frontal and lateral view. B, D, F. Paratype, ♂ (IEGU), habitus in dorsal, frontal and lateral view. Scale bars = 1 mm.

Fig. 2. Machaerotypus stigmosus Li & Chen sp. nov. A. Paratype, ♂ (IEGU), forewing. B. Paratype, ♀ (IEGU), forewing. C. Paratype, ♀ (IEGU), hind wing. Scale bars: A–C = 0.5 mm. a–e = white parts.

Fig. 3. Machaerotypus stigmosus Li & Chen sp. nov., paratype, ♂ (IEGU). A, C, D. Genitalia in lateral, posterior and ventral view. B, E. Aedeagus, posterior and lateral view. F. Style, dorsal view. G. Lateral plate. Scale bars = 0.2 mm.

Fig. 4. Machaerotypus stigmosus Li & Chen sp. nov., paratype, ♀ (IEGU). A–B. Genitalia in lateral and ventral view. C. Sternite VII, ventral view. D. First valvulae, lateral view. E. Second valvulae, lateral view. F. Third valvulae (gonoplac), lateral view. Scale bars = 0.2 mm.

Fig. 5. Machaerotypus nodulus Li & Chen sp. nov., holotype, ♂ (IEGU). A–C. Habitus in frontal, lateral and dorsal view. D. Forewing. E. Hind wing. Scale bars: A–C = 1 mm; D–E = 0.5 mm.

Fig. 6. Machaerotypus nodulus Li & Chen sp. nov., holotype, ♂ (IEGU). A–C. Genitalia in lateral, ventral and posterior view. D. Lateral plate. E–F. Aedeagus in posterior and lateral view. G. Style, dorsal view. Scale bars = 0.2 mm.

Fig. 8.Pronotumof 13 species of genus Machaerotypus Uhler, 1896.A–M. Lateral view.a–g. Dorsal view. A, a. M. camelliaeChou & Yuan, 1981. B, b. M. rubronigrisFunkhouser, 1938. C, c. M. rubromarginatus Kato, 1940. D, d. M. semirubronigris Yuan & Chou, 1992. E, e. M. taibaiensis Yuan, 2002. F, f. M. yananensis Chou & Yuan, 1981. G, g. M. mali Chou & Yuan, 1981. H. M. stigmosus Li & Chen sp. nov. I. M. ishiharai Kato, 1940. J. M. subinermis Lindberg, 1927. K. M. sibiricus (Lethierry, 1876). L. M. arisanus (Kato, 1928). M. M. nodulus Li & Chen sp. nov. Figures based on Lindberg (1927), Kato (1928) and Yuan & Chou (2002). The dotted line represents the simulation diagram.

Fig. 7. Geographic distribution of species of Machaerotypus Uhler, 1896: 1. M. arisanus (Kato, 1928). 2. M. camelliae Chou & Yuan, 1981. 3. M. ishiharai Kato, 1940. 4. M. mali Chou & Yuan, 1981. 5. M. rubronigris Funkhouser, 1938. 6. M. rubromarginatus Kato, 1940. 7. M. semirubronigris Yuan & Chou, 1992. 8. M. sibiricus (Lethierry, 1876). 9. M. subinermis Lindberg, 1927. 10. M. taibaiensis Yuan, 2002. 11. M. yananensis Chou & Yuan, 1981. 12. M. stigmosus Li & Chen sp. nov. 13. M. nodulus Li & Chen sp. nov.