Ismarus apertus, Kim, Chang-Jun, Copeland, Robert S. & Notton, David G., 2018

Kim, Chang-Jun, Copeland, Robert S. & Notton, David G., 2018, The family Ismaridae Thomson (Hymenoptera, Diaprioidea): first record for the Afrotropical region with description of fourteen new species, African Invertebrates 59 (2), pp. 127-163 : 131-134

Ismarus apertus sp. n. Figure 2A− G

Diagnosis.

The new species can be differentiated from all Ismarus species by the completely open radial cell. Ismarus apertus sp. n. is similar to I. africanus sp. n. It differs mainly in the radial cell and sculpture of head and scutellum: in I. apertus sp. n., radial cell completely open, radial vein almost absent, head and scutellum smooth; in I. africanus sp. n., radial cell open, as venation becomes weak apically, head and scutellum rugose or rugulose

Type material

(1♀1♂). Holotype, 1♀, KENYA: Eastern Province, Mulu Musingila farm, farmland near small, seasonally wet area, 689 m alt., 2.11412°S, 38.23989°E, 13−27.XII.2016 (MT), R. Copeland leg., CJDAF010063 (deposited in NMK). Allotype, 1♂, KENYA: Eastern Prov., Kasaala area, just inside isolated woodland patch, 733 m alt., 2.07836°S, 38.22517°E, 3−17.XII.2015 (MT), R. Copeland leg., CJDAF010064 (ICIPE).

Description.

Holotype (Female). Head. Head in dorsal view much wider than long (11:7), slightly wider than width of mesosoma (11:9) (Fig. 2 A–B); POL: 11; LOL: 6; OOL: 9 (Fig. 2B); ocelli large, LOL slightly longer than diameter of lateral ocellus (4:3); vertex behind ocelli nearly flat in lateral view; eye large and without setae; inner orbits, frons and temple with few sparse setae; above antennal sockets, face and cheek with few long setae; antenna much shorter than body length (27:37); scape and pedicel with scattered setae; A3-A15 with dense and short setae; antennal segments in following proportions (length:width): 18:4; 7:4; 12:2.5; 10:3; 8:3.5; 7:4; 6:4.5; 6:5; 6:5; 6:5; 6:5; 6:5; 6:5; 6:5; 9:5 (Fig. 2A).

Mesosoma. Pronotum in dorsal view punctate with whitish long setae along posterior margin; pronotal shoulders angled; lateral pronotum predominantly punctate except smooth and slightly concave in the middle; mesoscutum smooth and convex with pairs of long setae in front of scutellar pit; notauli present anteriorly, pits merged with the curved notauli (Fig. 2C); humeral sulcus deep and long, much longer than length of tegula (11:5); scutellum smooth and distinctly convex, lateral rims straight, posterior rim slightly emarginate with strongly prominent posterolateral corners (Fig. 2C); anterior scutellar pit small and deep, much shorter than remaining scutellar disc, crenulate at bottom, median keel weakly present (Fig. 2C); mesopleuron smooth with deep crenulate line along posterior margin; metapleuron punctate-rugose and covered with dense whitish long setae.

Wings. Radial cell completely open, radial vein almost absent (Fig. 2D).

Legs. Fore and mid legs slender; hind tibiae incrassate posteriorly, its maximum width slightly wider than hind femora (5:4).

Metasoma. Petiole short and distinctly expanded (23:39), strongly punctate; tergites matte, with fine micropunctures; base of second tergite with several short costae basally and very short median furrow, 0.15 × length of second tergite; sutures between tergites complete and deeply impressed (Fig. 2G).

Colour. Body black; antennae yellowish-brown except A9−A15 brown, tegulae dark brown and legs uniformly yellow; wings hyaline, covered with brown setae.

Measurements. Head length 0.49 mm, width 0.77 mm; mesosoma length 0.92 mm, width 0.64 mm; metasoma length 1.18 mm; fore wing length 2.00 mm; body length 2.59 mm.

Male (Allotype). Body length 1.88 mm. Similar to female, but antennae brown except scape yellow; base of second tergite with several short costae basally and median furrow completely absent; blade-like carina on A4 percurrent (Fig. 2F); antennal segments in following proportions (length:width): 15:5; 6:4; 7:3; 7:3.5; 5:3.5; 5:4; 4:4; 4:4; 4:4; 4:4; 4:4; 4:4; 4:4; 8:4 (Fig. 2E).

Distribution.

Kenya.

Etymology.

The specific name apertus is derived from the Latin adjective which means open.