Tipula (Beringotipula) unca Wiedemann, 1817

Podeniene, Virginija, Nasevičiene, Nijole & Podenas, Sigitas, 2019, Notes on the first instar larvae of the genus Tipula (Diptera: Tipulidae), Zootaxa 4567 (1), pp. 90-110 : 97-98

Tipula (Beringotipula) unca Wiedemann

( Figs. 22–30 )

Examined material: 2 egg-larvae from female captured near Lazdijai, N54.24080, E23.51551, 12 VI 2011, eggs were laid on 14 VI 2011, egg-larvae hatched on 26 VI 2011; 4 egg-larvae from female captured near Lazdijai, N54.24072, E23.51525, 12 VI 2011, eggs were laid on 16-VI-2011, egg-larvae hatched on 30 VI 2011; 27 egglarvae from female captured near Lazdijai, N54.24063, E23.51554, 24 VI 2013, eggs were laid on 27-VI-2013, egg-larvae hatched on 0 1 VII 2013.

First instar larva. Length 1.65–1.69 mm, width 0.37–0.39 mm. Body covered with pale microscopic hairs. Cuticle transparent.

Head capsule. Length 0.34–0.36 mm, width 0.21–0.22 mm. In general, very similar to that of T. (L.) vernalis . Differences were noticed in shape of hypostomium, mandible, antenna and arrangement of sensory structures on labrum. Hypostomium bears five sharp long teeth and middle tooth much more prominent than in T. (L.) vernalis ( Fig. 22 ). Mandible generally very similar to that of T. (L.) vernalis , but shape of apical tooth slightly different ( Fig. 23 ). Shape of segment of antenna and size of apical papilla differ from that of T. (L.) vernalis ( Fig. 24 ). Labrum in general is very similar to that of T. (L.) vernalis , but there are one medium long and three short setae on anterior part of labral lobe, which arranged in line, two very short setae located below them ( Fig. 25 ). Arrangement of setae on frontoclypeus is slightly different ( Fig. 26 ).

Thorax. Very similar to that of T. (L.) vernalis .

Abdomen. In general very similar to that of T. (L.) vernalis . Seta D1 very short ( Fig. 27 ), D5 almost twice as long as D1, D6 very long almost five times as long as D1, D5 twice as long as D1, D2 and D3 three times as long as D1, D4 four times as long as D1. D2–D3 and D5–D6 make pairs and are very close to each other. V1 absent. V2 and V5 short, V3 and V4 twice as long as V2 and V5 ( Fig. 28 ), V2–V3 and V4–V5 make pairs and are very close to each other. Setae L1, L2 and L3 closer to each other than to L4 ( Fig. 29 ). L1, L2 and L4 short; L2 three times as long as L1, L2 and L4.

Spiracular disc. Spiracular field surrounded by four flat and elongate round-tipped lobes ( Fig. 30 ). Lateral pair more prominent with sinuous inner margin. Lateral lobe almost 1.5 times as long as wide at the base. It bears single long stout apical bristle, which is four times as long as lobe itself. Inner part of lobe covered with pale S-shape sclerite (outer margin of sclerite darker than the rest of lobe). Length of ventral lobe the same as its width at the base. Outer margin of lobe sinuous. Base of sclerite covered by small triangular in shape dark sclerite. It has three tufts of setae on the outer margin of lobe. The outermost tuft consists of five long setae, tuft of two short setae below it. The innermost tuft consists of four long setae. Two large triangular-shaped, elongated dark sclerites and five tufts of longer and shorter setae located above the each spiracle. The innermost tuft consists of four long setae. Laterally from it is tuft of five long setae. Further laterally, is tuft of four long setae and next to it is tuft of two very long setae; the outermost tuft consists of nine long setae. Spiracles large, circular and close to each other. Distance between them less than diameter of a spiracle.

Anal field. Anus surrounded by four long, cone-shaped, white and fleshy anal papillae. Posterior pair almost three times as long as anterior pair. Few long setae present on anal segment.

Figures

FIGURES 22–30. Tipula (Beringotipula) unca, first instar larva. 22: hypostomium; 23: right mandible 24: right antenna; 25: general view of labrum; 26: frontoclypeal seta; 27: dorsal abdominal setae (segments II–VII); 28: ventral abdominal setae (segments II–VII); 29: lateral abdominal setae (segments II–VII); 30: spiracular field.