Trissolcus atys (Nixon)

Talamas, Elijah J., Buffington, Matthew L. & Hoelmer, Kim, 2017, Revision of Palearctic Trissolcus Ashmead (Hymenoptera, Scelionidae), Journal of Hymenoptera Research 56, pp. 3-185 : 7

Trissolcus atys (Nixon) Figures 13-16

Telenomus atys Nixon, 1935: 76, 86, 96 (original description, keyed); Risbec, 1950: 558, 560 (description, keyed).

Trissolcus atys (Nixon): Masner, 1965: 124 (type information, generic transfer); Johnson, 1992: 623 (cataloged, type information).

Description.

Female body length: 0.88-0.71 mm (n=3). Male body length: 0.74 mm (n=1). Body color: head and mesosoma black, metasoma brown.

Head. Color of radicle: yellow. Length of radicle: less than width of clypeus. Color of A1-A6 in female: yellow. Color of A7-A11 in female: brown. Number of basiconic sensilla on A6: 0. Number of basiconic sensilla on A7: 2. Facial striae: absent. Number of clypeal setae: 6. Microsculpture on gena directly above mandibular condyle: absent. Shape of ventral gena in lateral view: narrow. Genal carina: present and extending dorsally to vicinity of lower margin eye. Malar striae: present. Sculpture of malar sulcus: faintly rugulose. Orbital furrow: uniform in width between midpoint of eye and malar sulcus. Macrosculpture of frons between antennal scrobe and anterior ocellus: transversely strigose ventrally, absent dorsally. Preocellar pit: present. Setation of lateral frons: sparse. Punctation of lateral frons: absent. Sculpture directly ventral to preocellar pit: microsculptured. Macrosculpture of lateral frons: areolate. OOL: separated by less than one ocellar diameter. Hyperoccipital carina: absent. Anterior margin of occipital carina: finely crenulate to smooth.

Mesosoma. Epomial carina: present. Macrosculpture of lateral pronotum directly anterior to netrion: striate, striae formed by elongation of cells of netrion sulcus. Netrion sulcus: complete. Pronotal suprahumeral sulcus in posterior half of pronotum: undifferentiated from sculpture of dorsal pronotum. Number of episternal foveae: 0. Subacropleural sulcus: present. Speculum: transversely strigose; with granular microsculpture. Mesopleural pit: extending ventrally into dorsoventral furrow parallel to mesopleural carina. Mesopleural carina: complete. Sculpture of femoral depression: smooth. Patch of striae at posteroventral end of femoral depression: absent. Setal patch at posteroventral end of femoral depression: absent. Microsculpture of anteroventral mesopleuron: present throughout. Macrosculpture of anteroventral mesopleuron: irregularly rugulose. Postacetabular sulcus: formed by open crenulae. Setation of posteroventral metapleuron: absent. Sculpture of dorsal metapleural area: absent. Posterodorsal metapleural sulcus: present as line of foveae. Paracoxal sulcus in ventral half of metapleuron: indistinguishable from sculpture to absent. Anteroventral extension of metapleuron: not extending to base of mesocoxa. Metapleural epicoxal sulcus: present as coarse rugae. Mesoscutal humeral sulcus: indicated by smooth furrow with a small number of cells. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: areolate, longitudinally striate along posterior margin. Pattern of mesoscutal microsculpture: uniform throughout. Mesoscutal suprahumeral sulcus: comprised of cells. Length of mesoscutal suprahumeral sulcus: about half the length of anterolateral edge of mesoscutum. Parapsidal line: absent. Notaulus: absent. Median protuberance on anterior margin of mesoscutellum: absent. Shape of dorsal margin of anterior lobe of axillar crescent: acute. Sculpture of anterior lobe of axillar crescent: dorsoventrally strigose. Posterodorsal margin of axillular carina: pointed. Macrosculpture of mesoscutellum: rugose throughout. Microsculpture on mesoscutellum: present throughout. Median mesoscutellar carina: absent. Setation of posterior scutellar sulcus: present. Form of metascutellum: single row of cells. Metanotal trough: foveate, foveae occupying more than half of metanotal height. Metapostnotum: invaginated near lateral edge of metascutellum. Length of postmarginal vein: about twice as long as stigmal vein. Color of legs: coxae brown, trochanters and proximal femora pale brown, elsewhere yellow.

Metasoma. Longitudinal striae on T1 posterior to basal costae: absent. Number of sublateral setae (on one side): 2. Setation of laterotergite 1: absent. Longitudinal striation of T2: faintly present anteriorly. Setation of T2: present in a transverse line posteriorly. Setation of laterotergite 2: present. Posteriorly directed setae on medial S1: present.

Diagnosis.

Trissolcus atys can be separated from other Palearctic species in the basalis group by the absence of episternal foveae (Figure 16 ), a rugose mesoscutellum (Figures 13 , 15 ), fine transverse striation on the frons (Figure 14 ) and a mesopleural carina that extends from the mesopleural pit to the ventral mesopleural carina (Figure 15 ).

Link to distribution map.

http://hol.osu.edu/map-large.html?id=3187

Material examined.

Holotype, female, T. atys : UGANDA: Kampala, XI-1930, reared from egg, H. Hargreaves, B.M. TYPE HYM. 9.245a (deposited in BMNH) . Other material: (2 females, 1 male) KENYA: 1 female, 1 male, USNMENT01109872-01109873 (USNM). UNITED ARAB EMIRATES : 1 female, USNMENT00896187 (CNCI).

Figures

Figures 13 - 16. T. atys, female (USNMENT 00896187) 13 female (USNMENT 00896187) head, mesosoma, metasoma, dorsal view 14 female (USNMENT 00896187) head, anterior view 15 female holotype (B. M. TYPE HYM. 9.245 a), head and mesosoma, lateral view 16 female (USNMENT 00896187) head and mesosoma, anterolateral view. Scale bars in millimeters.