Separatatus megagnathus Sohn & van Achterberg, 2022

Sohn, Ju-Hyoeng, Achterberg, Cornelis van, Kim, Sangjin, Lim, Jongok & Kim, Hyojoong, 2022, A new species of the genus Separatatus Chen & Wu (Hymenoptera, Braconidae, Alysiinae) from South Korea, ZooKeys 1097, pp. 209-216 : 209

Separatatus megagnathus Sohn & van Achterberg sp. nov.

Fig. 1A-L

Type material.

Holotype, ♀ (KNA), South Korea, DMZ Botanical Garden, Mandae-ri, Haean-myeon, Yanggu-gun, Gangwon-do, 38°15'09.3"N, 128°06'40.6"E, 20.VI.-4.VII.2017, Shin & Kim leg. GenBank accession number MZ717197.

Comparative diagnosis.

The new species belongs to the subgenus Separatatus Separatatus Chen & Wu ( Zhang et al. 2020). It runs in the key by Yao et al. (2018) to S. malaysiae because of the less developed areola of the propodeum and distinctly postfurcal vein m-cu of the fore wing. Both species can be separated as follows:

1	Emargination between first and second teeth of mandible absent or nearly so (Fig. 1L ); medio-posterior depression of mesoscutum elongate and about half as long as mesoscutum medially (Fig. 1F ); ventral (= fourth) lobe of mandible small (Fig. 1L ); body black or blackish; precoxal sulcus present anteriorly (Fig. 1G ); legs partly brown or dark brown (Fig. 1A ); S. Korea	S. megagnathus Sohn & van Achterberg, sp. nov.
-	Incision between first and second teeth of mandible present; medio-posterior depression of mesoscutum round and small; ventral lobe of mandible medium-sized; body reddish brown or yellowish brown; precoxal sulcus absent anteriorly; legs yellow; W. Malaysia	S. malaysiae (Fischer, 2006)

Description.

♀: length of body in lateral view 2.5 mm, length of antenna 2.6 mm, and length of fore wing 2.8 mm. Colour. Body entirely dark brown; head in dorsal view entirely black, in anterior view reddish brown, around eye brown, antenna brown, mandible orangish brown and apically dark brown. Head. Head (Fig. 1D ) width 2.2 times median length in dorsal view. Antenna (Fig. 1B ) as long as body, 25 segmented. First flagellomere 0.9 times as long as second. Eye slightly oval and glabrous, 1.1 times as long as wide in lateral view. Width of face (Fig. 1E ) 2.2 times its height from ventral rim of antennal sockets to upper margin of clypeus; face with long setae and smooth. Eye in dorsal view 1.2 times as long as temple. Ocello-ocular line (OOL) 4.2 times longer than diameter of anterior ocellus; OOL:antero-posterior ocellar line (AOL):postero-ocellar line (POL) = 19:6:8. Vertex smooth and polish with groove. Mandible (Fig. 1J ) with four teeth and setae; dorsal tooth large and lobe-shaped, small incision between first and second teeth; ventral (fourth) tooth lobe-shaped, middle of tooth curved down; second tooth relatively narrow and sharp with dark brown tip and separated from first tooth by incision in lateral view (Fig. 1L ). Medial length of mandible 1.5 times its maximum width. Labrum 3.2 times longer than wide. Maxillary palp 0.7 times longer than mesosoma. Mesosoma. Mesosoma (Fig. 1G ) 1.8 times longer than wide in dorsal view and 1.4 times its height in lateral view; notauli crenulated, not reaching medio-posterior depression; medio-posterior depression distinctly elongated, half as long as mesoscutum medially; scutellar sulcus with two carinae; in lateral view mesopleuron smooth and shiny, precoxal sulcus (Fig. 1F ) distinct but absent posteriorly and with 11 crenulae; metapleuron distinctly rugose and with long setae. Propodeum largely smooth, its median carina medium-sized, connected to irregular transverse carina (Fig. 1F ); posterior areola incomplete; in lateral view propodeum curved dorsally, with submedian corner. Wings. Fore wing (Fig. 1C ) 2.3 times longer than wide; pterostigma long and rather broad, 3.8 times longer than wide; base of vein 1-R1 narrow; vein r of fore wing 5.0 times longer than wide, 0.6 times width of pterostigma and arising from its basal 0.6; vein 1-M and vein 1-SR+M slightly bent; vein 2-SR+M and r-m not sclerotized; vein r-m inclivous; vein 2-SR:vein r:vein 3-SR = 10:3:11; first subdiscal cell of fore wing 2.5 times longer than wide medially; vein m-cu distinctly postfurcal. Hind wing 4.1 times longer than wide; vein M+CU slightly bent; vein M+CU:1-M:1r-m = 11:6:3. Legs. Hind coxa smooth and 1.1 times longer than trochanter; hind femur 0.8 times as long as hind tibia and 7.1 times longer than wide; hind tibia as long as hind tarsus. Metasoma. First tergite widened posteriorly, striate and narrow, 0.8 times longer than its apical width; first tergite 0.6 times longer than second. Setose part of ovipositor sheath (Fig. 1I ) 0.8 times longer than mesosoma, as long as hind tibia and with long setae. Male. Unknown.

Distribution.

South Korea.

Etymology.

From “megas” (Greek for large) and “gnathos” (Greek for jaw) because of the large mandible.

Figures

Figure 1. Separatatus megagnathus sp. nov., ♀ A habitus, lateral view B antennae C wings D head, dorsal view E head, front view F mesosoma, dorsal view G mesosoma, lateral view H anterior half of metasoma, dorsal view I ovipositor sheath, lateral view J mandible, lateral view K mandible, antero-lateral view L mandible with teeth. Scale bars: 1 mm (A, C); 0.5 mm (B, I); 0.3 mm (D-H); 0.1 mm (J-L)