Dryocosmus species

Melika, George, Pujade-Villar, Juli, Abe, Yoshihisa, Tang, Chang-Ti, Nicholls, James, Wachi, Nakatada, Ide, Tatsuya, Yang, Man-Miao, Pénzes, Zsolt, Csóka, György & Stone, Graham N., 2010, 2470, Zootaxa 2470, pp. 1-79 : 34-35

Key to the Western Palaearctic Dryocosmus species

(a couplet for the separation of Chilaspis species is included)

1 Females ....................................................................................................................................................................... 2

- Males .......................................................................................................................................................................... 10

2 Mesoscutellum entirely smooth, shiny; at most a very narrow strip laterally and posteriorly along emarginate edges sculptured; disk of mesoscutellum always smooth, shiny ........................................................................................... 3

- Mesoscutellum entirely and uniformly coriaceous or rugose ....................................................................................... 5

3 Scutellar foveae more or less distinct, separated by distinct median carina ................................................................ 4

- Scutellar foveae absent, anteriorly only a transverse impression present .................................................. D. tavakolii

4 Pedicel and scape not broadened, only slightly or not broader than flagellomeres, all flagellomeres nearly of the same width; mesoscutellum with wrinkles and rugae along lateral and posterior sides, scutellar foveae not distinctly delimited by median carina and posteriorly ........................................................................................... Chilaspis spp.

- Pedicel and scape strongly broadened, at least 2.2–2.5 times broader than flagellomeres; flagellomeres towards the apex broadened, F8–F12 at least 2.0 times as broad as preceding flagellomeres; mesoscutellum with narrow stripe of wrinkles and rugae along lateral and posterior sides, scutellar foveae distinctly delimited by median carina and posteriorly .................................................................................................................................................... D. caspiensis

5 Gena not or inconspicuously broadened behind eye, not visible in anterior view....................................................... 6

- Gena strongly broadened behind eye, easily visible in anterior view ..................................... D. cerriphilus , asexual

6 Entire body reddish brown to light yellowish brown ................................................................................................... 7

- Entire body black or brownish black ............................................................................................................................ 8

7 Compound eye large, silvery, transfacial distance nearly equal to height of eye, body uniformly light brown to yellowish .............................................................................................................................................................. D. mikoi

- Compound eye small, black, transfacial distance longer than height of eye; head and mesosoma reddish brown, metasoma darker .......................................................................................................................................... D. jungalii

8 All metasomal tergites, except 2nd, with distinct uniform dense micropunctures; mesoscutellar disk reaching mesoscutum in the center, very narrow anterior scutellar depression present only on both sides of this attachment point ................................................................................................................................................................. D. kuriphilus

- All metasomal tergites, including 2nd, without micropunctures; mesoscutellar disk never reaching mesoscutum; broad uninterrupted transverse anterior scutellar depression present across mesoscutellum ...................................... 9

9 Mesoscutellum distinctly longer than broad, rugose to coriaceous, elongate, with nearly parallel sides, with narrow median carina reaching mesoscutum and dividing medially the smooth shiny broad anterior scutellar depression; body usually black or dark brown ................................................................................................................... D. mayri

- Mesoscutellum as long as broad or only slightly longer than broad, dull rugose, without median carina, with rugose anterior scutellar depression; body usually brown to reddish brown ......................................... D. cerriphilus , sexual

10 Body entirely yellow, except dark brown or black head ............................................................................................ 11

- Body black or dark brown ......................................................................................................................................... 12

11 Mesoscutellum smooth, shiny, without sculpture; head black .................................................................... D. jungalii

- Mesoscutellum uniformly coriaceous, head brown ........................................................................................ D. mikoi

12 Diameter of lateral ocellus more than distance between ocellus and margin of eye; mesopleuron uniformly smooth shiny or delicately alutaceous; mesoscutellar disk alutaceous or very delicately coriaceous ........................ D. mayri

- Diameter of lateral ocellus less than distance between ocellus and margin of eye; mesopleuron smooth shiny, with longitudinal very delicate striae (wrinkles) in medioanterior part; mesoscutellar disk uniformly coriaceous to rugose ................................................................................................................................................................ D. cerriphilus