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

Xiao, Yishen, Hong, Dawei, Li, Zhu & Yang, Ding, 2025, First report of the genus Swammerdamella Enderlein, 1912 (Diptera: Scatopsidae) in China, with descriptions of nine new species, Zootaxa 5723 (1), pp. 49-70 : 58-60

8. Swammerdamella papillata sp. nov. ĦNJDzĸxü

( Figs. 5A–5F )

Diagnosis. M fork complete and shorter than stem. The posterior margin of male tergite and sternite 6 modified, both truncated. Median process of male tergite 7 obvious and posteriorly pointed. Aedeagus large and sclerotized.

Description. Male ( Fig. 5A ). Body length 1.5–1.9 mm, wing length 1.4–1.7 mm.

Head. Dark brown, slightly higher than long; antennae 10-segmented; flagellum 8-segmented, each flagellomere with a whorl of microtrichia; last flagellomere distinctly elongate, twice as long as preceding one; eyes holoptic; palpus one-segmented, brown, apically rounded and pointed at apex.

Thorax. Dark brown and shining; scutum short, brown pilose. Anterior spiracular sclerite elongated and triangular. Halters concolorous with scutum, stem with several setae. Legs short, and concolorous with body.

Wing ( Fig. 5B ). Membrane nearly hyaline; anterior veins sclerotized and brown, R 1 and R 4+5 short, joining the costa close to each other; M fork complete but hardly visible, divergence near the apex of wing; CuA sigmoid and bent abruptly to posterior margin; a sparse row of macrotrichiae on posterior margin of wing.

Abdomen. Strong, stout and dark brown; segments 1–6 visible; sternite 6 ( Fig. 5C ) sparsely setose, posterior margin truncated and devoid of setae; tergite 6 ( Fig. 5D ) sparsely setose, posterior margin with a rectangular projection and devoid of setae. Segment 7 ( Fig. 5F ) retracted into segment 6; tergite 7 highly modified, with a long, triangular, and posteriorly pointed projection; both arms short and apically acute; sternite 7 rounded, with a shallow, rectangular median concavity on inner margin.

Male terminalia ( Fig. 5E ). Subequal in length and width; aedeagus plate oval and dark; aedeagus long, sclerotized and truncate apically; a pair of elongate, acute lobes beside aedeagus plate.

Female. Body length 1.6–1.8 mm, wing length about 1.5 mm. Similar to male in general morphological characters.

Type Material. HOLOTYPE: ♂, China, Yunnan Province, Kunming [ ḆOi], Changchongshan [ ẗƦƜ] [ 27°10’ N, 102°44’ E, 2005m], collected by sweep net, 2024. VI. 10, Yishen Xiao ( CAU) . PARATYPES: 3♂ 3♀, same data as holotype .

Distribution. China ( Yunnan Province).

Etymology. This specific name is derived from the Latin adjective “papillatus”, which means “teat-like”, referring to the shape of male tergite 6.

Remarks. This species can be easily recognized by the elongate and posteriorly pointed ventral process of male tergite 7, and a triangular truncated projection on posterior margin of tergite 6. This species shares the same posteriorly pointed median process with S. globus . S. papillata is another species discovered in the Oriental Region, collected from a dry mountain in Kunming, Yunnan Province.

Figures

FIGURE 5A–5B. 5A. Swammerdamella papillata sp. nov., male adult. 5B. Wing. 5C. Male sternite 6. 5D. Male tergite 6. 5E. Male terminalia. 5F. Male segment 7. Scale bar 1.0 mm (5A–5B), 0.1 mm (5C–5F).