Lenziella

Giłka, Wojciech, 2011, Six unusual Cladotanytarsus Kieffer: towards a systematics of the genus and resurrection of Lenziella Kieffer (Diptera: Chironomidae: Tanytarsini), Zootaxa 3100, pp. 1-34 : 31

Key to pupae of Lenziella

1. Frontal apotome with stout cephalic tubercles and extensive fields of strongly granulose sculpture (Figs 3, 7, 10, 14: A); hemispherical tubercle between basal lobe of thoracic horn and precorneal swelling present (Figs 3, 7: B, C; 10B; 14: B, E): Cladotanytarsus (Lenziella) .................................................................................. 2

–. Frontal apotome with relatively small cephalic tubercles and/or fine sculpture or apotome smooth; hemispherical tubercle between basal lobe of thoracic horn and precorneal swelling absent [see also Bilyj & Davies (1989, figs 18–43); Langton (1991) and Langton & Visser (2003)]: Cladotanytarsus (Cladotanytarsus) , not keyed.

2. Thoracic horn large, c. 300 µm long (Fig. 3B); TII hook row with 130–150 hooklets (Fig. 3D); posterolateral comb of SVIII with 15–25 teeth and 3–10 smaller spines (Fig. 3F); anal lobe with 40–47 taeniate setae per side (Fig. 3E).............................................................................................. C. (L.) bicornutus (Kieffer)

–. Thoracic horn small, c. 30–60 µm long ( Figs 7 , 10 , 14 : B); TII hook row with 65–90 hooklets ( Figs 7 D, 10C, 14F); posterolateral comb of SVIII with 6–12 teeth and 0–10 smaller spines ( Figs 7 F; 10E, F; 14H); anal lobe with 25–38 taeniate setae per side ( Figs 7 E, 10D, 14G)............................................................................... 3

3. Cephalic tubercles with setae about four times as long as tubercle ( Fig. 14 A); thoracic horn spindle-shaped ( Fig. 14 B, C); tergite patches with spinulate shagreen laterally and microspinulae arranged in distinct short rows ( Fig. 14 G)............................................................................................. C. (L.) subletteorum sp. nov.

–. Cephalic tubercles with setae about twice as long as tubercle ( Figs 7 A, 10A); thoracic horn subtriangular ( Fig. 7 B) or clubshaped ( Fig. 10 B); tergite patches with spinulate shagreen laterally and microspinulae/points placed in irregular rows/clusters or arranged evenly ( Figs 7 E, 10D)........................................................................ 4

4. Thoracic horn subtriangular, uniformly pale yellowish ( Fig. 7 B)............................ C. (L.) crusculus (Saether)

–. Thoracic horn club-shaped, darkly coloured at base ( Fig. 10 B).............................. C. (L.) latissimus sp. nov.

Figures

FIGURE 7. Cladotanytarsus (Lenziella) crusculus (Saether, 1971), pupa. A: frontal apotome; B: thoracic horn, precorneal swelling and tubercle; C: precorneal tubercle (magnified); D: row of hooks on abdominal tergite II and its magnified part; E: abdomen and spine patches of tergites II – VI (magnified); F: ventral tubercle and posterolateral comb of segment VIII (typical form).

FIGURE 10. Cladotanytarsus (Lenziella) latissimus sp. nov., pupa. A: frontal apotome; B: thoracic horn, precorneal swelling and tubercle; C: row of hooks on abdominal tergite II and its magnified part; D: abdomen and spine patches of tergites II – VI (magnified); E, F: ventral tubercle and posterolateral comb of segment VIII: typical shape (E), variation (F).

FIGURE 14. Cladotanytarsus (Lenziella) subletteorum sp. nov., pupa. A: frontal apotome; B: thoracic horn, precorneal swelling and tubercle; C: variation of thoracic horn (chaetae omitted); D: thoracic horn broken (magnified); E: precorneal tubercle (magnified); F: row of hooks on abdominal tergite II and its magnified part; G: abdomen, spine patches and rows of microspinules on tergites II – VI (magnified); H: posterolateral comb of segment VIII (variation).