Tachydromia nigrohirta 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 : 29-30

Tachydromia nigrohirta Gonçalves, Grootaert & Andrade sp. nov.

urn:lsid:zoobank.org:act:4DC85AF4-8CAA-429A-A6DF-1F071BD34857

Figs 1 , 10 , 15 C–D, 17 C–D, 19 I, 20 G–H

Diagnosis

Overall very dark and hirsute. Wing dimorphic: male stenopterous; lobed distal apex, suboval, with minute digitation on apical margin. Stalk-like process dark brown on basal half, pale on distal half; distal ⅔ of lobe black, basal ½ and digitation translucid; female micropterous, wing bilobate. Palpi, proboscis and antennae black. Postpedicel lanceolate, 2 times as long as pedicel; stylus 1.5 times as long as scape, pedicel and postpedicel combined. Legs mostly black except for yellowish to pale brown trochanters, knees and tarsomeres 1 and 2. Abdomen black, tergites uniformly covered by grey microtrichia and long setae. It closely resembles T. lusitanica , from which it can mainly be distinguished by the noticeably darker leg colouration, male wing with only a minute digitation on apical margin, and male terminalia.

Etymology

Name composed of two Latin words: ‘ niger ’ (nigro) meaning ‘black’ and ‘ hīrtus ’ (hirta) meaning ‘hairy’. The name combination indicates that this is a characteristically dark and hairy species.

Type material examined

Holotype SPAIN • 1 ♂; Salamanca , El Maíllo; 40º33′24.8″ N, 6º10′23.9″ W; 30 Mar. 2015; A.R. Gonçalves and R. Andrade leg.; RBINS.

Paratypes SPAIN • 2 ♂♂, 2 ♀♀; Salamanca , El Maíllo; 40º33′24.8″ N, 6º10′23.9″ W; 30 Mar. 2015; A.R. Gonçalves and R. Andrade leg.; RBINS • 3 ♂♂, 2 ♀♀; Salamanca , El Maíllo; 40º33′24.8″ N, 6º10′23.9″ W; 25 Apr. 2017; A.R. Gonçalves leg.; RBINS .

Additional material examined

SPAIN • 3 ♂♂, 2 ♀♀; Salamanca , El Maíllo; 40º33′24.8″ N, 6º10′23.9″ W; 30 Mar. 2015; A.R. Gonçalves and R. Andrade leg. • 3 ♂♂, 5 ♀♀ (all male terminalia studied, RBINS); Salamanca , La Alberca; 40º29′04.0″ N, 6º05′10.2″ W; 31 Mar. 2015; A.R. Gonçalves and R. Andrade leg. • 1 ♂, 3 ♀♀; Salamanca , La Alberca; 40º29′04.0″ N, 6º05′10.2″ W; 25 Apr. 2017; A.R. Gonçalves leg. • 2 ♂♂, 2 ♀♀; same collection data as for preceding; ZFMK • 4 ♂♂, 2 ♀♀; Salamanca , El Maíllo; 40º33′24.8″ N, 6º10′23.9″ W; 25 Apr. 2017; A.R. Gonçalves leg. • 2 ♂♂ , 1 ♀♀; Salamanca , Villasrubías; 40°19′42.3″ N, 6°38′42.1″ W; 25 Apr. 2017; A.R. Gonçalves leg.

Description

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

Male

MEASUREMENTS. Body length: 2.4–2.6 mm (n = 5). Wing length: 0.7–0.8 mm (n = 5).

HEAD. Ocellar tubercle glabrous, shiny black. Lateroclinate ocellars ca ½ smaller than length of postpedicel. Proclinate verticals ca ½ as long as postpedicel.

ANTENNA. Postpedicel lanceolate, 2 times as long as pedicel. Stylus 1.5 times as long as scape, pedicel and postpedicel combined.

THORAX. Postpronotal lobe with ca 7 setae laterally.

WING. Stalk-like portion dark brown on basal half, pale on distal half ( Fig. 20G ).

LEGS. Black, except for yellowish to brown trochanters, knees and tarsomeres 1 and 2. Fore tibia with dense ciliation of long hair-like setae (distinctively larger than maximum diameter of tibia) with curved tips. Mid tibia anteroventral apical spur with distinct apical elongation ( Fig. 19I ), on basal half margin with 4 short, stout, curved spinose setae.

TERMINALIA ( Fig. 10 ). Left epandrial lamella ½ shorter than left cercus, deeply bilobed. Left surstylus 2 times as long as wide.

Female

Similar to male, except for following features: micropterous, wing round, brownish, bilobate, apical margin of each lobe bearing setae, posterior lobe with 1 long seta and the anterior with 3 short setae, both covered with grey microtrichia ( Fig. 20H ); legs covered with regular rows of setae; spur on mid tibia absent; cercus pale brown with grey microtrichia and setae; no longer setae on apical sternites.

Distribution

Spain. Only known from a few localities in the western part of the Iberian Central System.

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. 10. Terminalia of Tachydromia nigrohirta 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. 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. 20. 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–B. T. ebejeri Gonçalves, Grootaert & Andrade sp. nov. C–D. T. cantabrica Gonçalves, Grootaert & Andrade sp. nov. E–F. T. lusitanica (Grootaert, Shamshev & Andrade, 2009). G–H. T. nigrohirta Gonçalves, Grootaert & Andrade sp. nov. Scale bars: A–B, D, F, H = 10 µm; C, E, G = 50 µm.