Neozavrelia, Goetghebuer & Thienemann, 1941

Orel, Oksana V., 2021, Revision of the genus Neozavrelia Goetghebuer, Thienemann, 1941 (Diptera Chironomidae) from Eastern Siberia and the Russian Far East, with the description of new species, Zootaxa 4938 (3), pp. 251-297 : 253-254

Key to adult males of the genus Neozavrelia

1. Antenna with 10 flagellomeres. Anal point covered with microtrichia and short colorless spines. The lateral lobes at the anterior margin of tergite IX are well developed. Digitus well developed, extends beyond the edge of the superior volsella or forms a separate lobe......................................................................................... 2

- Antenna with 13 flagellomeres. Anal point with dark spines of various lengths. The lateral lobes on the anterior margin of tergite IX are absent. Digitus only partially extends beyond the edge of the superior appendage or is located under it......... 8

2. Digitus protrudes beyond the edge of the superior volsella and is located on a separate lobe. Anal point narrow and expanded medially ( Figs 5–6 ). Inferior volsella foot-shaped laterally ( Figs 7–8 ).................. N. fengchengensis Wang & Wang

- Digitus is developed to varying degrees, but does not form a separate lobe. The anal process, if narrow, is not expanded medially. Inferior volsella laterally of a different shape............................................................ 3

3. Total body color light yellow. The last segment of the antenna short (<800 μm) and apically widened ( Fig. 124 ). Sensilla chaetica on ta 1 P 2 absent............................................................... N. yakuefea (Sasa & Suzuki)

- Total body color yellowish brown or dark brown. Apex of last segment of antenna without widening. Sensilla chaetica on ta 1 P 2 usually present........................................................................................ 4

4. The anal point broadly triangular, rounded apically. The superior volsella is elongated-oval, expanded medially and covers only the base of the digitus ( Figs 89–91 , 96–99 ). Sensilla chaetica on ta 1 P 2 absent. The apex of the antenna apex slightly widened ( Fig. 94 ). AR 0.56–0.61............................................................. N. paramushirica sp. nov.

- The anal point parallel-sided. The superior volsella oval-shaped, half covers the digitus. Basitarsus of mid leg with 2–5 sensilla chaetica. The apex of the antenna normal................................................................... 5

5. Inferior volsella reaches 2/3 of the length of the gonostylus. Anterior margin of tergite IX straight. Superior volsella without microtrichia ( Figs 60 , 67–70 )........................................................... N. nadezhdae sp. nov.

- Inferior volsella reaches 1/2 of the length of the gonostylus. Anterior margin of tergite IX triangular. Superior volsella usually with microtrichia...................................................................................... 6

6. Mid tibia with 1 spur ( Fig. 45 ). Antenna length <900 μm. Maxillar palp length <500 μm, second palpomere swollen ( Fig. 43 ). R with 11–15, R 4+5 with 2 setae, M 3+4 without setae......................................... N. kuzmichikha sp. nov.

- Mid tibia with 2 spurs. Antenna length>900 μm. Maxillar palp length>500 μm, second palpomere narmal. R with 17–29, R 4+5 with 11–25, M 3+4 with 3–16 setae......................................................................... 7

7. Wing length 2.6–2.7 mm. Antenna length about 1200 μm. R 1 with 0–4 setae. Frontal tubercles absent always. Gonostylus 133–150 μm long. Superior volsella densely covered with microtrichia ( Figs. 53–59 )................ N. minuta (Linevich)

- Wing length 1.8–2.4 mm. Antenna length less than 1200 μm. Frontal tubercles are about 2 mm in diameter or absent. R 1 with 8–14 setae. Gonostylus 102–129 µm ( Figs 16–18 ). Superior volsella with rare microtrichia or without them ( Figs 13–15 )....................................................................................... N. kedrovaya sp. nov.

8. Ventral seta on the superior volsella absent. Superior volsella broad, elongated oval-shaped ( Figs 102–103 , 134–135 )...... 9

- Ventral seta on the superior volsella present. Superior volsella narrow, elongated oval-shaped ( Figs 80–81 , 112–113 )...... 10

9. Anal point short and broad rounded apically, dorsally with 14–16 dark strong spinulae located in a semicircle in the apical part ( Figs 132–135 ). Maxillary palp normal ( Fig. 136 )............................................... N. zarya sp. nov.

- Anal point sclerotized along the edges, truncated apically, medially with 5 dark spinulae ( Figs 108–109 ). The second member of the maxillary palp is longer than the third and fourth ( Fig. 104 )................................ N. samarga sp. nov.

10. Microtrichia located between the anal tergite bands form a reticular pattern. Anal point triangular ( Figs 110–111 , 118 ). Maxillary palp length 255 μm ( Fig. 114 )........................................................... N. tygda sp. nov.

- Microtrichia between anal bands located as usual. Anal point parallel-sided, sometimes slightly triangular ( Figs 78–80 , 86 ). Maxillary palp length 290–325 μm ( Fig. 82 )......................................... N. oyabeparvulus (Sasa et al.)

Figures

FIGURES 1–8. The male of Neozavrelia fengchengensis Wang, Wang. 1—frontal tubercles; 2—maxilar palp and clypeus; 3—antenna; 4—apical part of wing; 5, 6—total view of hypopygium; 7, 8—lateral view of hypopygium. Scale bar 50 μm.

FIGURES 123–126. The male of Neozavrelia yakuefea (Sasa, Suzuki). 123—head and maxillary palps; 124—antenna; 125– 126— hypopygium. Scale bar 50 μm.

FIGURES 88–92. Details of the structure of hypopygium the males of Neozavrelia paramushirica sp. nov. (88–91) and Neozavrelia mongolensis Reiss (92). 88—maxillary palp; 89—total view of hypopygium; 90, 92—superior and median volsellae, digitus; 91—tergite IX, lateral view. Scale bar 50 μm.

FIGURES 93–99. The male of Neozavrelia paramushirica sp. nov. 93—maxillary palps and clypeus; 94—antenna; 95—wing; 96–98—total view of hypopygium; 99—hypopygium, lateral view. Scale bar 50 μm.

FIGURES 60–64. Details of the structure of the male of Neozavrelia nadezhdae sp. nov. 60—total view of hypopygium; 61—lateral view of hypopygium; 62–64—thoracic horn. Scale bar 50 μm.

FIGURES 65–70. The male of Neozavrelia nadezhdae sp. nov. 65—head and maxillar palp; 66—antenna; 67–69—total view of hypopygium. Scale bar 50 μm.

FIGURES 43–48. The male of Neozavrelia kuzmychikha sp. nov. 43—head, dorsal view; 44—antenna; 45—apical part of mid tibia; 46—tibia and basitarsus of fore leg; 47, 48—hypopygium. Scale bar 50 μm.

FIGURES 53–55. Details of the structure of the male of Neozavrelia minuta (Linevich). 53—total view of hypopygium; 54—lateral view of hypopygium; 55—gonostylus. Scale bar 50 μm.

FIGURES 56–59. The male of Neozavrelia minuta (Linevich). 56—head and maxillar palp; 57—antenna; 58, 59—total view of hypopygium. Scale bar 50 μm.

FIGURES 9–22. Details of the structure of the male of Neozavrelia kedrovaya sp. nov. 9—maxilar palp; 10—total view of hypopygium; 11, 12—anal point; 13—superior volsella; 16–18—gonostylus and inferior volsella; 19–21—tergite IX, lateral view; 22—thoracic horn. Scale bar 50 μm.

FIGURES 100–103. Details of the structure of hypopygium the male of Neozavrelia samarga sp. nov. 100—total view of hypopygium, dorsal view; 101—tergite IX and anal point, dorsal view; 102, 103—superior volsella, dorsal view. Scale bar 50 μm.

FIGURES 132–135. Details of the structure of hypopygium the male Neozavrelia zarya sp. nov. 134—total view of hypopygium, dorsal view; 133—tergite IX and anal point, dorsal view; 134, 135—superior volsella, ventral and dorsal view. Scale bar 50 μm.

FIGURES 77–81. Details of the structure of hypopygium the male of Neozavrelia oyabeparvulus (Sasa et al.). 77—total view of hypopygium, dorsal view; 78, 79—tergite IX and anal point, dorsal view; 80, 81—superior volsella, ventral and dorsal view. Scale bar 50 μm.

FIGURES 110–113. Details of the structure of hypopygium the male of Neozavrelia tygda sp. nov. 110—total view of hypopygium, dorsal view; 111—tergite IX and anal point, dorsal view; 112, 113—superior volsella, ventral and dorsal view. Scale bar 50 μm.

FIGURES 136–140. The male of Neozavrelia zarya sp. nov. 136—head and maxillary palps; 137–138—wing; 139, 140—hypopygium. Scale bar 50 μm.

FIGURES 104–109. The male of Neozavrelia samarga sp. nov. 104—head and maxillary palps; 105—antenna; 106–107— wing; 108, 109—hypopygium. Scale bar 50 μm.

FIGURES 114–119. The male of Neozavrelia tygda sp. nov. 114—head and maxillary palps; 115—antenna; 116–117—wing; 118–119—hypopygium. Scale bar 50 μm.

FIGURES 82–87. The male of Neozavrelia oyabeparvulus (Sasa et al.). 82—maxillary palps; 83—antenna; 84, 85—wing; 86, 87—hypopygium. Scale bar 50 μm.