Eurytoma tomentosae, Park & Lee, 2021

Park, Duk-Young & Lee, Seunghwan, 2021, A new species of Eurytoma (Hymenoptera, Chalcidoidea, Eurytomidae) from South Korea, feeding on seeds of Prunus tomentosa Thunb. (Rosaceae), Journal of Hymenoptera Research 85, pp. 1-9 : 1

Eurytoma tomentosae sp. nov.

Figs 1A-H , 2A-G

Type material.

Holotype female; South Korea: Incheon, Yeonsu-gu, Solsaem-ro 43beon-gil, 42, Mt. Cheongnyang, 37°25'20.6"N, 126°39'50.7"E, 12.v.2019, found on fruits of Prunus tomentosa , Duk-Young Park (in SNU). Paratype. 7 females, 10 males, same data as holotype, 5 females, 16 males (in SNU); same data as holotype except 11.v.2019, Jihwan Park (in SNU).

Etymology.

The species is named after the host plant, Prunus tomentosa .

Diagnosis.

This new species differs from others of Eurytoma amygdali species-group in the comparatively small body length, short funicular segments, metasoma shorter than head+mesosoma, especially the syntergum half as long as Gt6 and not upturned.

Description.

Female (Fig. 1A , habitus). Body length 4.61-4.74 mm, including ovipositor. Antenna (Fig. 1B ) black except radicle and clava dark brown; scape sparsely setose, spindle-like. Body black except mandible reddish-brown to dark apically, labial and maxillary palpi (Fig. 1C ) black basally to apical tips yellowish-brown, knees brown to whitish-yellow medially, tibiae narrowly apically brown, ovipositor sheaths pale; with hair-like to slightly lanceolate yellow setae. Fore wing (Fig. 1H ) pale yellowish, but deeply yellow infuscated below apical half of submarginal vein to stigmal vein; veins brownish-yellow and setae yellow. Hind wing yellowish-hyaline with pale-yellow setae.

Head 1.87-1.97 × as wide as long and temples as long as one third of eye length in dorsal view (Fig. 1D ); 1.39-1.52 × as wide as high in frontal view (Fig. 1C ); OOL:POL:LOL:MPOD = 2.0:2.5-2.6:1.0-1.1:1.0; scrobal depression adjoined from anterior ocellus, somewhat strigulate, carinate laterally and ground-shaped bottle in form; frons with yellowish lanceolate setae except between eyes and ocelli. Malar space 0.70 × as long as height of eye. Mandible 3-toothed. Vertex and upper face entirely areolate except between eyes and ocelli coriaceous-punctured; lower face areolate-strigose converged towards clypeus, but clypeus smooth to somewhat strigose; malar sulcus shallowly and widely groved. Lateral outline of gena distinctly convex in frontal view; genal carina present.

Antenna (Fig. 1B ). Scape slightly swollen anteromedially; 3.67-3.75 × as long as wide. Pedicel short, 0.9-0.95 × as long as wide. Anellus 0.6-0.66 × as long as wide. Funicle 6-segmented; F1 approximately 1.5 × as long as wide; F2-F6 slightly longer than wide; each funicular with two rows of MPS; all setae subdecumbent. Clava 1-segmented; 2.87-2.99 × as long as wide.

Mesosoma (Fig. 1E, F ). In dorsal view, mesosoma 1.60-1.61 × as long as wide; pronotum, and mesoscutum respectively 2.22 × and 1.5 × as wide as long; mesoscutellum 1.11 × as long as wide. Propodeum approximately 125° angle to the plane of scutellum. Pro- and mesonotum densely coriaceous-punctured except anterior area of mesoscutal lateral lobe smooth in dorsal view and neck alutaceous. Sides of pronotum straight, not convex. Notauli distinctly impressed, narrow. Axilla clearly separated from scutellum by impressed axillar groove. Propodeum with irregularly rugulose-areolate and concave mesal area bearing distinct median carina on anterior half, lateral area areolate (Fig. 1G ). Prepectus smooth except medial area to anterior and anteroventral margin rugulose. Tegula entirely smooth except posterior and ventral margin imbricate; with 2 distinct setae. Epicnemium hardly margined laterally by low epicnemial carina. Mesosternal shelf absent. Mesepisternum with variously smooth to strigose upper one-fourth and confused-areolate in lower three-fourth; adscrobal carina delimiting anteriorly femoral depression and reaching ventrally the mesocoxal foramen; femoral depression and mesepimeron with irregular carinulae, but the latter with smooth posterior margin. Metepimeron areolate and bearing long and thin erect setae, merging to propodeum posteriorly. Legs. Procoxa imbricate except smooth medially, without carina; setation bare medially. Mesocoxa without lamella. Metacoxa bare dorsally at base. Fore wing (Fig. 1H ) 2.34-2.39 × as long as wide, cc: mv: pmv: stv = 5.3-5.5: 1.3-1.4: 1.2-1.4: 1.0. Stigmal vein approximately an angle of 35° with the postmarginal vein. Stigma with sharp uncus.

Metasoma. Petiole wider than long, with slightly rough-coriaceous dorsal surface and highly rised carina transversally. Gaster ovate and smooth, about 1.59-1.74 × as long as length and 1.75-1.82 × as long as width. Gt4 slightly longer than Gt3; with short setae on anterior admarginal area. Gt5 and Gt6 similar in length; with hair-like yellow setae. Syntergum short and not upturned. Apex of ovipositor sheath round.

Male (habitus Fig. 2A ). Body length 3.99-4.0 mm. Morphologically similar to females except the following. Antenna (Fig. 2B ) with funicle 6-segmented and clava 1-segmented; funicular segments petiolate, the bodies almost square. Head (Fig. 2C ) with OOL: POL: LOL: MPOD = 2.0-2.3:2.8:1.2:1.0. Propodeum (Fig. 2D ) less rugulose-areolate than female. Metasoma with long petiole punctured and less rugulose (Fig. 2D ).

Host.

Prunus tomentosa Thunb. ( Rosaceae ).

Biology.

Adults of this species were observed emerging from seeds and mating in May. After mating, females oviposit inside premature fruits, and hatching larvae develop by eating the insides of seeds. They overwinter in a larval stage and pupate in spring before escaping from the seeds.

Distribution.

South Korea.

Figures

Figure 1. A-H Eurytoma tomentosae, female A habitus B antenna C head, frontal view D head, dorsal view E mesosoma, lateral view F mesosoma, dorsal view G propodeum H wing.

Figure 2. A-H Eurytoma tomentosae A-D male A habitus B antenna C head, dorsal view D propodeum and petiole E ovipositing behavior of female F larva in seed G pupa in seed H seed of P. tomentosa after adults of E. tomentosae emerged.