Striatoandricus sanchezi Pujade-Villar, 2022

Cuesta-Porta, Víctor, Arnedo, Miquel A., Cibrián-Tovar, David, Barrera-Ruiz, Uriel M., García-Martiñón, Rosa D., Equihua-Martínez, Armando, Estrada-Venegas, Edith G., Clark-Tapia, Ricardo, Romero-Range, Silvia & Pujade-Villar, Juli, 2020, A New Genus of Oak Gall Wasp, Striatoandricus Pujade-Villar (Hymenoptera: Cynipidae: Cynipini) from America with Descriptions of Two New Mexican Species, Zoological studies (Zool. Stud.) 59 (8), pp. 1-21 : 14-17

Striatoandricus sanchezi Pujade-Villar n. sp.

( Figs. 8–10 ) urn:lsid:zoobank.org:act:8DD9822F-1911-4213-BF47-0E43BD4E9032

Type material: HOLOTYPE 8 deposited in JP – V col. ( UB) with the following labels: “ Parque Nacional de Sierra de Quila (Tcolotlàn, Jalisco, México), 20°16'40.98"N, 104°05'06.22"W (white label), “Ex Quercus magnoliifolia Née , (06–iii–10) 16/20– iii–10, A. Equihua and E. Estrada leg.” (white label); “ Holotype Striatoandricus sanchezi Pujade-Villar n. sp. desig–2019” (red label) . PARATYPES: 48 with the same labels of Holotype (deposited in JP-V col. ( UB)) .

Etymology: Species dedicated to Jordi Sànchez i Picanyol, pacifist and Catalan activist, president of the Assemblea Nacional de Catalunya (ANC) when he entered into a preventive prison in Spain.

Diagnosis: The new species is the only species of the genus with posterior median sulcus and 15 antennomers segments.

Description: (agamic generation)

Length: 2.1–3.0 mm (n = 5).

Color ( Fig. 10a ): Chestnut; proximal half of antennae and distal half of legs amber; head and mesosoma chestnut with some black marks; metasoma slightly lighter; wing venation light brown.

Head ( Fig. 8b–c ): With sparse setae, not dense. Coriaceous with fine carinae extending from lateral margins of clypeus to basal and lower lateral margins of compound eyes; medial area of face elevated between toruli and clypeus, finely alutaceous, not carinated; front and vertex coriaceous. Transversally ovate in frontal vision, 1.1x wider than high; 2.1x wider that high in dorsal view, narrower than the mesosoma width. Gena coriaceous, maximum width subequal to maximum width of compound eye. Malar space 0.3x as long as height of compound eye, malar sulci absent. POL:OOL:LOL distances 32:12:15; maximum diameter of lateral ocellus 12. Transfacial line slightly longer than maximum height of compound eye. Toruli diameter 2.0x longer than space between them, and subequal to distance to compound eye. Clypeus trapezoidal, mostly smooth; sparsely pubescent; tentorial pits present; epistomal sulci and clypeo-pleurostomal line inconspicuous; anterior margin slightly prominent not medially incised. Front slightly elevated in central part not forming a median carina.

Antennae ( Fig. 8a ): With 15 segments, shorter than total length of body (7.3:8.5), but longer than head + mesosoma (7.3: 4.5); pedicel slightly longer than broad; placoid sensilla present from distal half of F3 onwards. F4–F13 broader than F1–F3; F1 similar in length to F2. Antennal formula: 14: 10: 24: 21: 19: 17: 16: 14: 14: 11: 11: 10: 9: 14.

Mesosoma ( Figs. 1e , 8d–f , 9b–c ): Slightly longer than high in lateral view, with setae in pronotum, mesepimeron, scutellum, propodeum and along notauli. Pronotum almost smooth with some alutaceous areas; anterior margin narrow and emarginated. Mesoscutum coriaceous, slightly broader than long (measured at tegulae level); notauli incomplete but long, extending about 0.8x of total length of mesoscutum; medial line present, 0.25x as long as mesoscutum; anterior parallel and parapsidal lines visible through a finer sculpture. Scutellum circular, lateral and posterior thirds coarsely rugulose with dorsal coriaceous, almost smooth, and glabrous central area; almost as long as broad, 0.6x longer than mesoscutum; protruding posteriorly over metanotum; scutellar fovea smooth, ellipsoid, separated by a septum, broader than long, and slightly oblique to transversal axis; axillae smooth to finely alutaceous with sparse pubescence. Mesopleuron striated, speculum alutaceous with some piliferous points; mesepimeron striate with uniform dense pubescence; mesepisternum glabrous on superior third and sparsely pubescent with fine sculpture on lower half. Dorsellum subrectangular, convex inferiorly, smooth on central part and laterally rugulose; metanotal trough rugulose. Metapleura uniformly pubescent; metapleural sulcus reaching mesopleuron in the upper 2/3 of its height. Propodeum carinae conspicuously curved throughout all its extension; central part smooth and glabrous; lateral area uniformly pubescent and finely alutaceous. Nucha present, with longitudinal carinae; posteriorly margined.

Wings ( Fig. 10a ): Forewings 1.3–1.4x longer than body, hyaline, margins ciliate; radial cell 4x longer than broad; R1 not reaching anterior margin of forewing; Rs slightly projected; areola closed forming a triangle; Rs + M projection reaching in the half of basal vein.

Legs: Tarsal claws with a conspicuous tooth forming an acute angle.

Metasoma ( Fig. 9a–b ): As long as high and 1.3–1.4x longer than mesosoma in lateral view; second metasomal tergite covering more than half of metasoma, finely striated with discontinuous striae and smooth small areas, pubescent on lateral part of anterior half, pubescence not reaching margins of tergite, posterior margin smooth; rest of tergites reticulated with the distal margin smooth and shiny; ventral spine not projected posteriorly over metasoma, 2x longer than broad, incise distally and with sparse lateral setae on each side that project over the tip of the spine, not forming a tuft.

Gall ( Fig. 10b ): Adheres to the central nerve on the lower face of the rarely leaves on the lower face. It is presented as a mass of brown wool with circular-looking shape, with a non-brittle pubescence, 2.0– 2.5 cm diameter. The pubescence is located above the central core forming a layer of 5–7 mm thick. The central polythalamous, light brown, dense and hard, without separating the larval chambers, which are slightly ovoid (1 × 1.5 mm). The number of larval cameras ranges from 7–15.

Biology: Only asexual females are known. The galls appear in August and the adults emerge in March.

Host: It occurs on Quercus magnoliifolia Née (section Quercus ), endemic species from México.

Distribution: México (Jalisco).

Figures

Fig. 8. Striatiandricus sanchezi n. sp.: (a) antenna with detail of last flagellomeres, (b) head in frontal view, (c) head and mesosoma in dorsal view, (d) mesosoma in dorsal view, arrow indicates median sulcus, (e) propodeum (f) detail of anterior part of mesosoma.

Fig. 9. Striatiandricus sanchezi n. sp.: (a) metasoma in dorsal view, (b) distal part of mesosoma and metasoma in dorso-lateral view, (c) mesosoma in lateral view. Arrows indicate irregular smooth areas.

Fig. 10. Striatoandricus sanchezi n. sp.: (a) body, (b) gall with detail of fused larval chambers.

Fig. 1. (a) Head in posterior view of S. georgei with details of occipital foramen and gular area (left) and mouth parts (right). Pronotum in lateral view of: (b) S. maesi, (c) S. cuxarti, (d) S. georgei and (e) S. sanchezi.