Machaerotypus nodulus Li & Chen, 2022

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 : 72-77

Machaerotypus nodulus Li & Chen sp. nov.

urn:lsid:zoobank.org:act:15335C7F-F247-48C1-B6EE-0B4E23E502A4

Figs 5–7 , 8M

Diagnosis

Forewing membrane mostly hyaline with irregular transverse brown band near base and distinct nodules along veins ( Fig. 5B, D ). Aedeagal shaft abruptly narrowed at distal third in lateral view with small preapical hump ( Fig. 6F ). Lateral plate apex blunt ( Fig. 6D ).

Etymology

The species name ‘ nodulus ’ is derived from the Latin word ‘ nodus ’ (knot), referring to the nodules along the forewing veins.

Material examined

Holotype CHINA • ♂; Guizhou Province, Dafang Country ; 27°19′ N, 105°61′ E; Mar. 2019; Xiu-dong Huang leg.; collected with yellow pan traps; IEGU.

Description

MEASUREMENTS. Male (n = 1) body length: 4.9 mm, forewing length: 4.1 mm, width between humeral angle apices: 1.9 mm, width between suprahumeral horn apices: 1.6 mm.

COLORATION. Orange-brown marked with golden yellow except the head, ocelli, callosity, apical of humeral angle and posterior pronotal process, inner of legs black, surfaces of legs rusty red. Forewing and veins pale yellow with the following parts brown: nodulations, apical, anal angle, apical and onethird of apical, crescent-shaped stripe near basal fourth forewing.

HEAD AND THORAX. Vertex nearly rectangular with dorsal and ventral margins slightly arcuate and oblique respectively, ocelli oblong, eyes oval, ocelli slightly closer to inner margin of eyes than to each other; frontoclypeus length more than half of vertex ventral margins, apical expanded slightly, frontoclypeal lobes distinct, length more than half of frontoclypeus, extended slightly across vertex ventral margins ( Fig. 5C–D ). Pronotum with big punctures on near middle carina, and small punctures evenly distributed. Callosity nearly oval, with small amounts of setae and puncture. Suprahumeral horn short and not exceeding humeral angle, nearly flat. Posterior pronotal process ending at Cu 1, with triangular bulge on center and apex. Forewing with more than 15 nodules on veins evenly distributed. Basal one-fifth of forewing punctate with opaque sclerotization, veins M and Cu fused for nearly half length and divergent, veins M+Cu and R fused basally ( Fig. 5D ). Metathoracic tibia with three longitudinal rows of cucullate setae.

MALE GENITALIA. Pygofer with dorsal margin concave slightly on the central in lateral view, sternite IX slightly curved, longer than wide in lateral view ( Fig. 6A, C ). Lateral plate apex blunt, depressed slightly on the central, with long setae on margin ( Fig. 6D ). Subgenital plates fused for more than half length ( Fig. 6B ). Style clasp angled dorsally; distally recurved, dorsal surface with setae; connective N-shaped ( Fig. 6G ). Aedeagus in lateral view nearly hook-shaped, abruptly narrowed at distal third and with slight preapical hump, narrow in anterior view, more than half of anterior surface and margin densely clothed with coarse denticulation ( Fig. 6E–F ).

Distribution

China (Guizhou) ( Fig. 7 ).

Remarks

This species is similar to M. subinermis Lindberg, 1927 , but differs from the latter in: 1) frontoclypeal lobes more than half as long as frontoclypeus (subequal in M. subinermis ); 2) apex of frontoclypeus transverse (arcuate in M. subinermis ); 3) posterior pronotal process arched (flat in M. subinermis ).

Figures

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. 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.

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.