Tachydromia stenoptera Gonçalves, Grootaert & Andrade, 2021

Gonçalves, Ana Rita, Grootaert, Patrick, Andrade, Rui, Paulo, Octávio S. & Mengual, Ximo, 2021, Revision of the morphology, phylogenetic relationships, behaviour and diversity of the Iberian and Italian ant-like Tachydromia Meigen, 1803 (Diptera: Hybotidae), European Journal of Taxonomy 732, pp. 1-56 : 37-46

Tachydromia stenoptera Gonçalves, Grootaert & Andrade sp. nov.

urn:lsid:zoobank.org:act:AB1CBE5D-22D9-4153-9EE5-FA711157B977

Figs 1 , 14 , 15 G–H, 17 G–H, 19 G, 21 F–G

Diagnosis

Overall very dark. Wing dimorphic: male stenopterous; wing with slightly lobed distal apex, dark for most part and lobe black and white; female micropterous, wing bilobate. Palpi, proboscis and antennae black; postpedicel lanceolate, ca 1.5 times as long as pedicel. Legs almost completely black. Abdomen black, tergites mostly glabrous and without grey microtrichia.

Etymology

The name of this species means ‘narrow wing’ and derives from the combination of two Greek words: the prefix steno- (stenos), meaning ‘narrow’, with the suffix -ptera (pterá), meaning ‘wing’. Hence, the name reflects the very narrow lobed distal apex of the male wing.

Type material examined

Holotype PORTUGAL • 1 ♂; Gouveia , São Pedro; 40°29′10.9″ N, 7°34′38.5″ W; 25 Apr. 2013; A.R. Gonçalves and R. Andrade leg.; RBINS.

Paratypes PORTUGAL • 1 ♂♂, 5 ♀♀; Gouveia, São Pedro ; 40°29′10.9″ N, 7°34′38.5″ W; 25 Apr. 2013; A.R. Gonçalves and R. Andrade leg.; RBINS • 5 ♂♂, 5 ♀♀; Guarda, Panóias de Cima ; 40°29′10.2″ N, 7°13′18.4″ W; 1 Apr. 2017; A.R. Gonçalves and R. Andrade leg.; RBINS .

Additional examined material

PORTUGAL • 1 ♀; Manteigas, São Pedro ; 40º19′07.0″ N, 7º34′37.4″ W; 25 Apr. 2013; A.R. Gonçalves leg. • 2 ♂♂, 9 ♀♀; Gouveia, São Pedro ; 40°29′10.9″ N, 7°34′38.5″ W; 25 Apr. 2013; A.R. Gonçalves and R. Andrade leg. • 3 ♂♂, 1 ♀; Guarda, Panóias de Cima ; 40°29′10.2″ N, 7°13′18.4″ W; 1 Apr. 2017; A.R. Gonçalves and R. Andrade leg. • 5 ♂♂, 5 ♀♀; same collection data as for preceding; ZFMK • 4 ♂♂, 1 ♀; Guarda, Adão ; 40°27′03.0″ N, 7°09′41.8″ W; A.R. Gonçalves and R. Andrade leg. • 3 ♂♂, 4 ♀♀; Sabugal, Quadrazais ; 40°18′30.6″ N, 6°59′08.7″ W; 1 Apr. 2017; A.R. Gonçalves and R. Andrade leg. • 1 ♂, 1 ♀; Sabugal, Seixo do Côa ; 40°24′48.0″ N, 7°01′07.6″ W; 1 Apr. 2017; A.R. Gonçalves and R. Andrade leg. • 1 ♂, 4 ♀♀; Sabugal, Fóios ; 40°17′43.3″ N, 6°52′38.9″ W; 1 Apr. 2017; A.R. Gonçalves and R. Andrade leg.

Description

Similar to Tachydromia cantabrica sp. nov. except for the following:

Male

MEASUREMENTS. Body length: 2.1–2.8 mm (n = 5). Wing length: 0.8 mm– 0.9 mm (n = 5).

HEAD. Lateroclinate ocellars same length as postpedicel. Proclinate verticals ca ¾ as long as postpedicel.

ANTENNA. Postpedicel lanceolate, ca 2 times as long as pedicel.

THORAX. Postpronotal lobe bearing ca 7 setae laterally, ca 6 acrostichal setae, scattered; notopleuron with 1 strong, prominent seta; 6 small setae near mesothoracic spiracle.

WING. Slightly lobed distal apex, without digitation ( Fig. 21F ).

LEGS. Overall black; ventral and dorsal posterior surface of coxae, trochanter, basal 0.1 ventral surface of femora and knees, paler. Fore tibia bearing sparse ciliation of hair-like setae slightly longer than maximum diameter of tibia. Mid tibia anteroventral apical spur with 4 short, stout, curved spinose setae on distal half margin.

ABDOMEN. Tergites with grey microtrichia only on anterior margin of tergite 1 and near spiracles; sternites overall covered by grey microtrichia. Tergites with few and scattered setae, mostly present on posteromarginal surface and near spiracles; sternites with evenly distributed setae; apical sternites with long, distinct setae.

TERMINALIA ( Fig. 14 ). Right epandrial lamella convex, globose. Right surstylus with several (ca 7) distinct denticle-like setae, mostly aggregated on distal margin. Right cercus longer than left, subcylindrical, left narrowing distally. Long setae of unequal length present on apical half of right cercus; long and stronger setae on apical margin of left cercus. Left epandrial lamella ⅔ as long as left cercus. Left surstylus suboval 2 times as long as wide, longer than cerci.

Female

Similar to male, except for following features: micropterous, with wings round, brownish wings, bilobate, bearing two setae on apical margin of each lobe, covered by grey microtrichia ( Fig. 21G ); legs covered with regular rows of setae, with distinct apical setae on fore femur, without other distinctive setae; apical projection on mid tibia absent; cercus pale brown with grey microtrichia and setae; without longer setae on apical sternites.

Distribution

Portugal. Only known from the western end of the Iberian Central System. It has not yet been found in Spain, but given that it was found very close to the border, it is very likely that it will eventually be found in this country.

Figures

Fig. 1. Currently known distribution of the Iberian ant-like Tachydromia Meigen, 1803. Each dot represents a presence point, with each colour corresponding to a different species. When two species co-occur in the same area, their presence is represented by a smaller dot on top of a dot of regular dimension, each of those with the colour corresponding to the co-occurring species. The dots surrounded by a black circle with a vertical line represent localities previously known.

Fig. 14. Terminalia of Tachydromia stenoptera Gonçalves, Grootaert & Andrade sp. nov., holotype (RBINS). A. Right surstylus and right epandrial lamella. B. Epandrium with cerci. C. Left epandrial lamella and left surstylus. D–E. Right surstylus. Scale bar: 0.1 mm.

Fig. 15. Habitus of live specimens of the Iberian ant-like Tachydromia Meigen, 1803. Males are pictured in the left column, females in the right. A–B. T. lusitanica (Grootaert, Shamshev & Andrade, 2009). C–D. T. nigrohirta Gonçalves, Grootaert & Andrade sp. nov. E–F. T. ebejeri Gonçalves, Grootaert & Andrade sp. nov. G–H. T. stenoptera Gonçalves, Grootaert & Andrade sp. nov. I–J. T. cantabrica Gonçalves, Grootaert & Andrade sp. nov.

Fig. 17. Mounted specimens of the Iberian ant-like Tachydromia Meigen, 1803. Males are pictured in the left column, females in the right. A–B. T. lusitanica (Grootaert, Shamshev & Andrade, 2009). C–D. T. nigrohirta Gonçalves, Grootaert & Andrade sp. nov. E–F. T. ebejeri Gonçalves, Grootaert & Andrade sp. nov. G–H. T. stenoptera Gonçalves, Grootaert & Andrade sp. nov. Scale bars: 1 mm.

Fig. 19. Images obtained by scanning electron microscopy of the spur-like structures present on the apical portion of the male mid tibia. A. T. lusitanica (Grootaert, Shamshev & Andrade, 2009). B. T. pandellei (Séguy, 1941). C. T. pieltaini (Gil Collado, 1936). D. T. ebejeri Gonçalves, Grootaert & Andrade sp. nov. E–F. T. semiaptera (Gil Collado, 1923). G. T. stenoptera Gonçalves, Grootaert & Andrade sp. nov. H. T. cantabrica Gonçalves, Grootaert & Andrade sp. nov. I. T. nigrohirta Gonçalves, Grootaert & Andrade sp. nov. J. T. apterygon Plant & Deeming, 2006. Scale bars: 10 µm.

Fig. 21. Drawings of the tip of stenopterous wings and images obtained by scanning electron microscope (SEM) of the micropterous wings. Males are pictured in the left column, females in the right. A, C. T. pandellei (Séguy, 1941). B–C. T. pieltaini (Gil Collado, 1936). D–E. T. semiaptera (Gil Collado, 1923). F–G. T. stenoptera Gonçalves, Grootaert & Andrade sp. nov. Scale bars: A–D, F = 50 µm; E, G = 10 µm.