Swammerdamella latilobata, Xiao & Hong & Li & Yang, 2025

7. Swammerdamella latilobata sp. nov. ÎƋDzĸxü

( Figs. 4A–4F View FIGURE 4 )

Diagnosis. M fork complete and obviously shorter than stem. Male tergite and sternite 6 densely setose. Tergite 6 unmodified, posteriorly with a row of setae. Median process of male tergite 7 obvious and rounded apically. Aedeagus short.

Description. Male ( Fig. 4A View FIGURE 4 ). Body length 1.6–1.8 mm, wing length 1.1–1.2 mm.

Head. Dull brown, higher than long; antennae 9-segmented; flagellum 7-segmented, each flagellomere with a whorl of microtrichia; last flagellomere distinctly elongate, twice as long as the preceding one; eyes holoptic; palpus one-segmented, brown, elongate and rounded apically.

Thorax. Dull brown, stout and relatively shining; scutum short and brownish pilose. Anterior spiracular sclerite elongate, triangular. Halters concolourous with scutum, and with a row of setae on stem. Legs concolourous with body, except for yellowish-brown tarsi.

Wing ( Fig. 4B View FIGURE 4 ). Membrane nearly hyaline; anterior veins sclerotised and brown, R 1 and R 4+5 short, joining costa close to each other; M fork highly visible and much shorter than its stem; CuA sigmoid, bent abruptly towards posterior margin; a row of macrotrichiae on posterior margin of wing.

Abdomen. Strong and dull brown; segments 1–6 visible; sternite 6 ( Fig. 4C View FIGURE 4 ) densely setose, with a wide and smooth concavity on posterior margin; tergite 6 ( Fig. 4D View FIGURE 4 ) densely setose, rectangular, with a row of setae on posterior margin. Segment 7 ( Fig. 4F View FIGURE 4 ) retracted into segment 6; tergite 7 modified, dorsally setose, with both arms short and apically acute; ventral process long, apically swollen and rounded, with a tiny triangular cleft on it; sternite 7 ventrally setose and rounded.

Male terminalia ( Fig. 4E View FIGURE 4 ). Subequal in length and width; aedeagus plate obvious, dark and elongate; two rectangular projections present on both sides of aedeagus plate with several setae on it; a large, triangular lobe stretched beneath, apically triangularly emarginated; aedeagus short.

Female. Body length 1.6–1.8 mm, wing length about 1.1 mm. Similar to male in general morphological characters.

Type Material. HOLOTYPE: ♂, China, Jilin Province, Hunchun [ NJƌ], Yangpao Tree Farm [ ěåū场] [ 42°53’ N, 130°34’ E, 150m], collected by sweep net, 2023. VI. 30, Yishen Xiao ( CAU) GoogleMaps . PARATYPES: 5♂ 5♀, same data as holotype GoogleMaps .

Other Material. 122♂ 20♀, China, Heilongjiang Province, Heihe [ Dzñ], Pingshan Tree Farm [ ṮƜū场] [ 49°34’ N, 126°56’E, 302m], collected by sweep net, 2024. VII. 6, Yuetian Gao ( CAU) GoogleMaps ; 1♂ 2♀, China, Heilongjiang Province, Jagedaqi [ 加éż奇], Dongfeng Tree Farm [ 东ṇū场] [ 50°23’ N, 124°6’ E, 397m], collected by sweep net, 2024. VII. 14, Yuetian Gao ( CAU) GoogleMaps ; 1♂, China, Heilongjiang Province, Tahe [ 塔ñ], Shibazhan [ 十Āü] [ 52°25’ N, 124°24’ E, 325m], collected by sweep net, 2024. VII. 11, Yuetian Gao ( CAU) GoogleMaps ; 1♂ 4♀, China, Jilin Province, Wangqing [ ĩdz], Dangshuhe Tree Farm [ IJŃñū场] [ 43°31’ N, 129°57’ E, 457m], collected by sweep net, 2023. VII. 4, Yishen Xiao ( CAU) GoogleMaps ; 1♂, China, Liaoning Province, Fushun [ Kũ], Lijiacun [ ṃṽť] [ 41°60’ N, 124°22’ E, 540m], collected by Malaise trap, 2020. VI. 20, Tao Li ( CAU) GoogleMaps ; 1♀, China, Liaoning Province, Fuxin [ şǔ], Zhangwu [ dzẋ] [ 42°37’ N, 122°54’ E, 83m], collected by Malaise trap, 2020. VI. 18, Tao Li ( CAU) GoogleMaps .

Distribution. China ( Heilongjiang Province, Jilin Province, Liaoning Province).

Etymology. This specific name is derived from the Latin adjective “latus” and noun “lobus”, which means “wide” and “hull”, referring to the large, concave lobe of male terminalia.

Remarks. This is a widely distributed species in Northeast China with about 150 specimen records. The antennae of S. latilobata are 9-segmented, the same as some other Palaearctic species like S. acuta , S. adercotris and S. brevicornis , but the terminalia of S. latilobata are distinct from them.