Merodon nigritarsis
Creators: name: Vujić, Ante
name: Radenković, Snežana
name: Likov, Laura
name: Trifunov, Sonja
name: Nikolić, Tijana
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Merodon
Merodon nigritarsis

description: Key to the males of Merodon nigritarsis group species
1. Posterior part of mid coxa without long pile (Merodon s.str.).................................................... 2
- Posterior part of mid coxa with long pile................................... Other Merodon groups (not treated here)
2. Species with white microtrichose longitudinal stripes on black mesoscutum and white microtrichose transverse bands on orange-brown tergites (Figs. 4 B, 5A, 5B, 4A); at least tergite 2 with reddish-orange marks; mesoscutum covered with erect, yellow pile; abdomen elongate, narrow and tapering, always longer than mesoscutum and scutellum together (Figs. 4 A–B, 5A–B); first flagellomere at most twice as long as wide (Fig. 6); legs without spikes or other protuberances (Figs. 7–9); tarsi dark brown/black dorsally and orange ventrally; at least metatarsus of hind legs always darkened dorsally; male genitalia: anterior lobe of surstylus (Fig. 10 A: a) more or less of rhomboid shape, except in the alagoezicus complex of species where it is transformed into a narrow, elongate, strongly curved projection (Fig. 1: a).......... Merodon nigritarsis group......... 3
- Species with different combination of characters.................. Other Merodon s. str. species groups (not treated here)
3. Hind femur narrow and elongate (Fig. 9 C); posterior lobe of the surstylus with strong interior accessory lobe of posterior lobe of the surstylus (Fig. 23 A: i).............................................................. Merodon nitidifrons
- Hind femur broader; posterior lobe of the surstylus without or with small interior accessory lobe of posterior lobe of the sursty- lus (as on Fig. 24 B: i)................................................................................... 4
4. Anterior lobe of the surstylus transformed to narrow, long, curved, upwards pointed extension (as on Figs. 23 B: a)......... 5
- Anterior lobe of the surstylus rhomboid shape (as on Figs. 23 G: a)............................................... 9
5. Apical part of hind tibia with clear ventrolateral lamella(as on Fig. 7 C: x)......................................... 6
- Apical part of hind tibia without clear ventrolateral lamella (as on Fig. 7 A)........................................ 8
6. Anterior lobe of the surstylus long, narrow, with rounded basal curve (Fig. 23 B: a); posterior lobe of the surstylus two times as long as its width, straight (Fig. 23 B: p)..................................................... Merodon alagoezicus
- Anterior lobe of the surstylus with angular basal curve; posterior lobe of the surstylus S-shaped (Figs. 23 C-D)............ 7
7. Anterior lobe of the surstylus with additional basal extension (Fig. 23 D: e)........................ Merodon satdagensis
- Anterior lobe of the surstylus without additional basal extension (Fig. 23 C).......................... Merodon schachti
8. Abdomen covered with pale pile; tergite 2 without white microtrichose marks (Fig. 5A). Posteriorlobe of the surstylus broader in anterior view (Fig. 20 A: p) and oval in lateral view (Fig. 11 A: p)........................ Merodon hakkariensis n. sp.
- Abdomen with short black pile on posteromedial part of tergite 3 and medial parts of tergite 4; tergite 2 usually with pair of white microtrichose marks (as on Fig.5B). Posteriorlobe of the surstylus narrower in anterior view (Fig. 20 B) and with lamellar structure in lateral view (Fig. 11 B: y).......................................................... Merodon lucasi
9. Face with bulge below antennae (Fig. 16 C); posterior lobe of the surstylus hook-like (Fig. 23 E: p); hind femur very broad (as on Fig. 9 B).......................................................................... Merodon crassifemoris
- Face without bulge.................................................................................... 10
10. Pile on hind femur very short on ventral surface (Fig. 8 A). Male genitalia on Figs. 10 A, 13A....... Merodon angustus n. sp.
- Pile on hind femur longer on ventral surface (as on Fig. 8 C)................................................... 11
11. Hind femur and tibia extremely curved (Fig. 8 C). Male genitalia: posterior and anterior lobe of the surstylus separated by deep incision (Fig.10 B); hypandrium on Fig. 13 B................................................. Merodon testaceus
- Hind femur and tibia less curved (as on Fig. 9 B). Male genitalia: posterior and anterior lobe of the surstylus not deeply divided (as on Fig. 9 A)....................................................................................... 12
12. Hind femur broad and covered with long anteroventral and posteroventral pile, as long as half of width hind femur (as on Figs. 9 A, 19)............................................................................................. 13
- Hind femur narrower and covered with shorter anteroventral and posteroventral pile................................ 15
13. Anterior lobe of the surstylus 2.5 times shorter than posterior lobe of the surstylus (Fig. 23 G)........... Merodon toscanus
- Anterior lobe of the surstylus less than 2 times shorter than posterior lobe of the surstylus (Fig. 12).................... 14
14. Anterior lobe of the surstylus short and broad, equilateral (Fig. 12 A); posterior lobe of the surstylus short and broad (Fig. 12 A)................................................................................ Merodon quadraticus n. sp.
- Anterior lobe of the surstylus elongate, triangular (Fig. 12 B); posterior lobe of the surstylus elongated and narrow (Fig. 12 A)......................................................................................... M. femoratoides
15. Lobe of the surstylus broad, anterior lobe of the surstylus very short (Fig. 23 F)..................... Merodon taniniensis
- Lobe of the surstylus elongated (as on Fig. 24 B)............................................................ 16
16. Male genitalia: posterior lobe of the surstylus short, as long as wide (Fig.24 A). Lateral projection of hypandrium narrow and short (Fig. 24 E: lt)....................................................................... Merodon nigritarsis
- Male genitalia: posterior lobe of the surstylus elongated, 1.5 times long as wide(Fig.24 B). Lateral projection of hypandrium longer (Fig. 24 F: lt).................................................................... Merodon latifemoris
description: Published as part of Vujić, Ante, Radenković, Snežana, Likov, Laura, Trifunov, Sonja & Nikolić, Tijana, 2013, Three new species of the Merodon nigritarsis group (Diptera: Syrphidae) from the Middle East, pp. 442-464 in Zootaxa 3640 (3) on pages 455-456, DOI: 10.11646/zootaxa.3640.3.7, http://zenodo.org/record/219951