Ceroptresini Nieves-Aldrey, Nylander & Ronquist, 2015

Lobato-Vila, Irene & Pujade-Villar, Juli, 2019, Revision of world Ceroptresini (Hymenoptera: Cynipidae) with the description of a new genus and five new species, Zootaxa 4685 (1), pp. 1-67 : 9

Ceroptresini Nieves-Aldrey, Nylander & Ronquist, 2015

Ceroptresini Nieves-Aldrey, Nylander & Ronquist, 2015 . In Ronquist et al. (2015: 35).

Diagnosis. Ceroptresini is the only tribe, along with Synergini , that includes inquilines associated with oak galls. The only autapomorphy of Ceroptresini that clearly separates this tribe from Synergini is having the second metasomal tergum (T2) short and free, not overlapped with the third tergum (T3), in both sexes (for example, Figs. 2b, c, k ; 11c, f ; 12f ; 13h ; 14e ; 15i ; 16l ; 17i ), whereas in Synergini these two tergites are fused, forming a large sclerite, in both sexes.

Redescription. Female antenna 12–13-segmented and usually subclavate (rarely filiform), male antenna usually 15-segmented and filiform, rarely obscurely 15-segmented (the last flagellar segments not clearly separated). Front and vertex weakly sculptured, almost smooth or alutaceous to finely coriaceous, always without frontal carinae. Occiput without distinct and sharp occipital carina. Ventral area of genae without vertical carinae. Malar space usually much shorter than height of compound eye. Lower face with striae radiating from sides of clypeus. With or without two vertical carinae running from inner ventral margin of the toruli. With or without a densely pubescent depressed area between and below the toruli. Pleurostomal sulcus absent, epistomal sulcus usually slightly impressed. Ventral margin of clypeus usually straight and not projected over mandibles, rarely slightly projected. Pronotum without lateral carinae and large medially. Dorsal part of pronotal plate complete, with its lateral margins marked throughout and reaching anterior margin of mesoscutum, and with two distinct and more or less widely separated admedian depressions (foveae). Dorsolateral margin of dorsal part of pronotal plate not projecting laterally. Mesoscutum smooth to strongly coriaceous, sometimes with weak discontinuous transversal elements. Notauli complete or incomplete, but never absent (although they are sometimes very narrow and shallow). Scutellar foveae always present, but sometimes very shallowly impressed or inconspicuous. Mesopleuron usually completely smooth and shiny, rarely with some striae or with an alutaceous sculpture anteriorly; mesopleural impression absent. Propodeal carinae uniformly straight (or at most very slightly curved) in their whole length or straight in the anterior 1/3, divergent and curved in the posterior 2/3 and branched distally. First metasomal tergum reduced to a dorsal smooth crescent-shaped scale, or ring-shaped and longitudinally sulcate like in Synergini . Second metasomal tergum (T2) small and free in both sexes, usually with a dense hair patch anterolaterally, rarely with sparse pilosity. Third metasomal tergum (T3) usually without punctures or just with a small posterodorsal patch of micropunctures, rarely with a posterior narrow band; never dorsodistally incised. Radial cell of the forewings closed. Ventral swelling with rows of costulae of profemur absent. Tarsal claws bidentate, with a basal lobe. Small wasps, usually ranging from 1.0 to 2.5 mm, rarely 3.0 mm or more. Body color mainly black or dark, rarely light brown or amber.

Figures

FIGURE 2. Type material of Ceroptres politus Ashmead, 1896: a) female habitus; b) male habitus; c) female dorsal view; d) male dorsal view; e) female lower face; f) female front; g) female head and mesosoma in dorsal view; h) male antenna; i) female antenna; j) propodeum; k) female lateral metasoma; l) forewing; m) pinned leaf fragment of Q. rubra with some nerve swellings deposited in USNM; n) type labels.

FIGURE 11. Ceroptres cerri a) head in anterior view, b) mesosoma in lateral view and c) metasoma in lateral view; C. clavicornis d) head in anterior view, e) mesosoma in lateral view and f) metasoma in lateral view.

FIGURE 12. Ceroptres junquerasi sp. nov.: a) female head in anterior view; b) female head in dorsal view; c) male head in anterior view; d) male head in dorsal view; e) propodeum; f) female metasoma in lateral view; g) mesosoma in lateral view; h) mesosoma in dorsal view; i) tarsal claws.

FIGURE 13. Ceroptres lenis sp. nov.: a) female head in anterior view; b) female head in dorsal view; c) mesosoma in lateral view; d) propodeum; e) female antenna; f) tarsal claws; g) mesosoma in dorsal view; h) female metasoma in lateral view; i) radial cell of the forewing.

FIGURE 14. Ceroptres mexicanus sp. nov.: a) female head in anterior view; b) female head in dorsal view; c) mesosoma in dorsal view; d) mesosoma in lateral view; e) female metasoma in lateral view; f) propodeum; g) tarsal claws; h) female antenna.

FIGURE 15. Ceroptres nigricrus sp. nov.: a) female head in anterior view; b) female head in dorsal view; c) mesosoma in lateral view; d) mesosoma in dorsal view; e) female antenna; f) radial cell of the forewing; g) propodeum; h) tarsal claws; i) female metasoma in lateral view.

FIGURE 16. Ceroptres quadratifacies sp. nov.: a) female head in anterior view; b) female head in dorsal view; c) male head in anterior view; d) male head in dorsal view; e) detail of the last segments of female antenna; f) female antenna; g) tarsal claws; h) mesosoma in lateral view; i) mesosoma in dorsal view; j) propodeum; k) radial cell of the forewing; l) female metasoma in lateral view; m) detail of the micropunctuation of the metasoma.

FIGURE 17. Ceroptres snellingi (material from Mexico): a) female head in anterior view; b) female head in dorsal view; c) male head in anterior view; d) male head in dorsal view; e) female antenna; f) male antenna (with a detail of the last segments, inset image); g) mesosoma in dorsal view; h) mesosoma in lateral view; i) female metasoma in lateral view; j) tarsal claws; k) propodeum; l) radial cell of the forewing.