Tanytarsus sinuatus Goetghebuer, 1936

Zhang, Zhi-Chao, Rong, Yue-Xiao, Nyima, Tenzin, Zhang, Rui-Lei & Lin, Xiao-Long, 2025, Tanytarsus dawai sp. nov. and larval morphology of T. sinuatus within the T. norvegicus species group (Diptera: Chironomidae), Zootaxa 5633 (2), pp. 316-335 : 329

Tanytarsus sinuatus Goetghebuer, 1936

( Figs 11–14 )

Tanytarsus sinuatus Goetghebuer, 1936 in Thienemann 1936: 185.

Tanytarsus alpicola Goetghebuer, 1950: 5 .

Tanytarsus sinuatus Reiss & Fittkau 1971: 134 .

Material examined. Holotype: male ( RBINS: 18.073), Germany, Bavaria, 1935, leg. et det. M. Goetghebuer. 3 males ( SHOU & BOLD sample ID: XL676, XL678, XL679), Italy, Trentino-Alto Adige/ Sudtirol, Trento , Peio , Stilfser Joch National Park , Glacier Lake below the Lago Marmotta , 46.434723°N, 10.677778°E, 2633 m, a.s.l., sweep net, 8.VII.2017, leg. X.L. Lin. 3 larvae ( SHOU & BOLD sample ID: XL55, XL438, SHOU sample ID: XL56), China, Xizang, Chamdo City , Ranwu Village , Ruanwu Lake , 29.50581°N, 96.76048°E, 3963 m a.s.l., 10.VII.2014, leg. X.L. Lin; 3 larvae ( SHOU & BOLD sample ID: XL3586, XL3587, XL3593), China, Qinghai, Bande Lake , 34.2161°N, 92.0769°E, 4600 m a.s.l., 12.VI.2020, leg. Jia-Ping Chen; 2 larvae ( SHOU & BOLD sample ID: XL2722, XL2723), China, Yunnan, Nu jiang of the Lisu Autonomous Prefecture , Lanping Bai and Pumi Autonomous County, Erdaobaihe Village , Glacial Lake , 26.5897222°N, 99.0213899°E, 3789 m a.s.l., 24.V.2018, leg. X.L. Lin; 1 larva ( SHOU & BOLD sample ID: XL3843), China, Xizang, Naqu, Nima Wetland, 31.7128°N, 92.0582°E, 4628 m a.s.l., 5.IX.2020, leg. Yu Peng; 1 larva ( SHOU & BOLD sample ID: XL3828), China, Xizang, Nyingchi City, Bayi, 29.7617°N, 94.742°E, 3332 m a.s.l., 28.IIX.2020, leg. Yu Peng.

Diagnostic characters. The adult male of Tanytarsus sinuatus can be distinguished from known species of the T. norvegicus species group by the following combination of characters: Frontal tubercles ( Fig. 11B ) cylindrical. Thorax ( Fig. 11C ) pale brown with dark brown on scutum and parapsidal suture, light brown on median anepisternum II, preepisternum and epimeron II. Ac absent. LR 1 1.48–1.50. Anal point ( Fig. 11D ) slender triangular, tapering near the apex, with 9–13 spinulae in single row between large parallel crests. Superior volsella ( Fig. 11E ) roughly slender elliptical in outline but extended into a robust tooth on the anal median side. Digitus ( Fig. 11F ) is thickened distally, significantly surpassing superior volsella and bears a small, well-discernible protuberance or lobe at mid length. Stem of median volsella ( Fig. 11F ) clublike thickened distally, with several lamellae of the broad awl-type. Inferior volsella ( Fig. 11F ) distal part round head-like.

Figures

FIGURE 11. Tanytarsus sinuatus Goetghebuer, 1936, holotype male. A. type specimen and labels; B. head; C. thorax; D. hypopygium; E. superior volsella; F. median volsella, digitus and inferior volsella. Scale bars: 50 μm in B, D; 100 μm in C; 25 μm in E, F.

FIGURE 12. Tanytarsus sinuatus Goetghebuer, 1936, larva. A. habitus; B. head capsule. Scale bars: 0.5 mm in A; 50 μm in B.

FIGURE 13. Tanytarsus sinuatus Goetghebuer, 1936, larval antenna, mandible and mentum.A, B. antenna; C, D. mandible; E, F. mentum. Scale bars: 25 μm.

FIGURE 14. Tanytarsus sinuatus Goetghebuer, 1936, larval premandible, labrum and maxillary.A, B. premandible; C. labrum; D. maxillary. Scale bars: 20 μm in A–C; 10 μm in D.