Dasyhelea serrana Díaz and Spinelli, 2014
Díaz, Florentina, Spinelli, Gustavo R., Donato, Mariano & Ronderos, María M., 2014, A taxonomic revision of the Patagonian species of the Dasyhelea mutabilis species group with a phylogenetic analysis of New World species (Diptera: Ceratopogonidae), Journal of Natural History (J. Nat. Hist.) 48 (35 - 36), pp. 2117-2175 : 2153-2160
treatment provided by
|Dasyhelea serrana Díaz and Spinelli|
Dasyhelea serrana Díaz and Spinelli sp. nov.
Only species of Dasyhelea in Patagonia with the following combination of characters: male with scutellum with 6 large and 1–2 thinner setae; tergite 9 rounded distally, produced beyond apex of gonocoxites; posteromedian projection of aedeagus stout, tip truncate and W/L ratio 1.33–1.65. Female scutum with contrasting pigmented pattern.
Description of male. Similar to female with usual sexual differences. Antennal flagellum ( Figure 12A View Figure 12 ) brown. Palpus ( Figure 12B View Figure 12 ) pale; segment 3 bearing scattered sensilla on basomesal surface; PR 4.75–5.25 (4.86, n = 9). Scutellum with 6 large, 1–2 thinner setae. Wing ( Figure 19F View Figure 19 ) length 0.72–0.87 (0.78, n = 10) mm, width 0.24– 0.30 (0.26, n = 10) mm; CR 0.41–0.44 (0.42, n = 10). Genitalia ( Figure 12C View Figure 12 ): tergite 9 rounded distally, produced beyond apex of gonocoxites, apicolateral process stout, moderately short with apical elongate seta; cercus with 3 setae; sternite 9 ( Figure 12D View Figure 12 ) 0.50 length of greatest width, posteromedian projection reaching half of aedeagus length, apex rounded, folded. Gonocoxite stout, 1.7 × longer than greatest width; gonostylus 0.8 length of gonocoxite, moderately broad basally, tapering slightly at one-third of length, slightly curved, apex slightly hooked. Paramere and gonocoxal apodemes forming an asymmetrical structure ( Figure 12E View Figure 12 ); gonocoxal apodemes with small subbasal tooth, left apodeme barely fused with paramere, right broadly fused with paramere, paramere moderately short, tapering distally to slender pointed tip. Aedeagus 0.86 length of greatest width, W/L ratio 1.33–1.65 (1.47, n = 9); anterior margin nearly straight, heavily sclerotized; basal arms stout, slightly recurved, directed posteriorly; posterolateral arms divided, inner portion elongate, recurved anterad 90° or more; posteromedian projection stout, tip truncate.
Description of female. Head dark brown. Eyes contiguous for distance of the width of 4 ommatidia. Antennal flagellum ( Figure 12F View Figure 12 ) pale; AR 0.79–0.90 (0.86, n = 10). Clypeus ( Figure 12G View Figure 12 ) elongate with 6 pairs of setae. Palpus ( Figure 12H View Figure 12 ) pale; segment 3 with 1–2 subbasal capitate sensilla; PR 4.25–5.00 (4.60, n = 10).
Thorax. Scutum dark brown, with contrasting pigmented pattern as in Figure 14G; scutellum pale brown with 6–7 large, 2–3 thinner setae. Legs with coxae, trochanters, femora pale brown, tibiae yellowish, tarsomeres 1–4 whitish, tarsomeres 5 infuscated; apex of hind tibia with 7 spines; foreleg TR 1.86–2.04 (1.94, n = 10), midleg TR 2.08–2.26 (2.17, n = 10), hind leg TR 1.96–2.19 (2.08 n = 10). Wing ( Figure 19E View Figure 19 ) length 0.66–0.78 (0.71, n = 10) mm, width 0.27–0.33 (0.30, n = 10) mm; CR 0.39–0.43 (0.41, n = 10); membrane hyaline, densely covered with macrotrichia; second radial cell with visible narrow lumen; cubital fork at level of anterior portion of second radial cell. Haltere brown, knob base whitish.
Abdomen. Pale brown. Subgenital plate ( Figure 12I View Figure 12 ) semicircular anteriorly, lateral margins parallel, with broad lumen, posteromedian projection small, bifurcate; posterolateral arms slender, distal one-third to one-half recurved 60–90°. Spermatheca ( Figure 12J View Figure 12 ) spherical, heavily sclerotized, diameter 36 µm, neck short, straight, measuring 12 µm.
Description of female pupa ( Figure 13A View Figure 13 ). Total length 1.92–2.04 (1.99, n = 3) mm. General coloration of exuviae yellowish. Dorsal apotome ( Figures 13B View Figure 13 , 14A) 2.04 × broader than long, apex broadly rounded, surface covered with strong spicules, each side of posterior surface with a pair of raised lateral areas with wrinkles; anterior margin straight; posterior margin with stout, rounded tubercle; dorsal apotome sensilla short, stout, located on well-developed tubercle with strong spicules ( Figures 13B View Figure 13 , 14A); DAL 0.072 –0.084 (0.078, n = 4) mm; DAW 0.016 –0.017 (0.016 n = 4) mm; DAW/DAL 1.86–2.17 (2.05, n = 4). Cephalothorax ( Figure 13A View Figure 13 ) surface smooth, length 0.78–0.84 (0.82, n = 4) mm, width 0.48–0.51 (0.49, n = 4) mm. Cephalothoracic sensilla as follows: three dorsolateral cephalic sclerite sensilla, two short, thin setae ( Figures 13B View Figure 13 , 14C), one campaniform sensilla; two anterolateral sensilla ( Figures 13D,E View Figure 13 , 14C), one long and thin, and the other one medium-sized seta; two medium-sized antermomedial sensilla ( Figures 13D,E View Figure 13 , 14C); three dorsals present ( Figures 14D, 15A View Figure 15 ) D-1-T, D-5-T short setae, D-3-T campaniform sensillum, supraalar campaniform sensillum (SA- 2-T) ( Figures 14D, 15A View Figure 15 ). Respiratory organ ( Figures 13A, C, E View Figure 13 , 14C) nearly straight, 9.00 × longer than broad, annulated, apex and base smooth, 6–7 apical and 5–6 lateral pores; RO length 0.20–0.23 (0.22, n = 5) mm, RO width 0.02 (n = 5) mm; pedicel (P) ( Figure 13E View Figure 13 ) slightly pale brown, smooth, short, stout, pedicel length 0.01–0.02 (0.02, n = 5) mm, P/RO 0.05–0.10 (0.08, n = 5). Two short clypeal/labral sensilla ( Figure 15B View Figure 15 ); two ocular sensilla ( Figure 15B View Figure 15 ), O-1-H medium-sized, thin sensillum, O-2-H campaniform sensillum. Abdominal segments covered with very small spinules. First abdominal segment ( Figures 13A View Figure 13 , 15C View Figure 15 ) with sensilla as follows: one D-2-I peg; D-4-I, D-7-I posterior campaniform
(AM-1-T, AM-2-T); dorsal apotome (DA); dorsal apotomal sensilla (DA-1-H); dorsolateral cephalic sclerite sensilla (DL-1-H, DL-2-H, DL-3-H); dorsal sensilla of segment 4 (D-2-IV, D- 4-IV, D-7-IV, D-8-IV); lateral sensilla of segment 4 (L-1-IV, L-2-IV); respiratory organ (RO); terminal process (TP).
sensilla; 3 lateral sensilla: L-1-I, L-3-I short setae, L-2-I medium-sized seta. Second abdominal segment similar to first, except three posterior sensilla, 2 campaniform sensilla, one thin, short hyaline seta. Segment 4 with sensillar pattern: ( Figures 13A View Figure 13 , F-G, 15D) as follows: D-2-IV peg; D-4-IV, D-7-IV pores, D-8-IV short, thin seta; L-1-IV medium-sized, thin seta, located on triangular tubercle, L- 2-IV, L-3-IV, L-4-IV short, stout setae, all located on flattened tubercle; 2 ventral sensilla, V-5-IV medium-sized, thin seta; V-6-IV short, stout seta, both located on flattened tubercles. Segment 9 ( Figures 13A, H View Figure 13 ) 0.92 × longer than width, ventral surface with spinules on anterior band; length 0.13–0.16 (0.14, n = 4) mm, width 0.12–0.14 (0.13, n = 4) mm. Terminal process triangular ( Figure 13H View Figure 13 ), divergent, tip pointed, base wide with two setae, one medium-sized, hyaline seta located on small tubercle, other short, stout seta on rounded tubercle, length 0.04–0.05 (0.04, n = 4) mm
Description of male pupa. Similar to female with sexual differences: Total length 2.16 (n = 2) mm. Exuviae pale brown. Dorsal apotome ( Figure 14B) with DAL 0.08–0.10 (0.09, n = 3) mm; DAW 0.18–0.19 (0.18, n = 3) mm, DAW/DAL 1.87–2.14 (2.00, n = 3). Clypeal/labral sensilla and ocular sensilla as in Figure 14E. Respiratory organ: RO length 0.19–0.21 (0.20, n = 3) mm, RO width 0.02 (n = 3) mm; pedicel length 0.01–0.02 (0.02, n = 3) mm, P/RO 0.05–0.12 (0.10, n = 3). Cephalothorax length 0.84–0.93 (0.90, n = 3) mm, width 0.54–0.57 (0.56, n = 3) mm. Segment 9 ( Figure 14F) length 0.16–0.18 (0.17 n = 3) mm, width 0.16–0.18 (0.17 n = 3) mm; terminal process ( Figure 14F) length 0.04–0.05 (0.04, n = 3) mm.
Distribution ( Figure 21 View Figure 21 )
Argentina (Buenos Aires, Río Negro) .
Holotype male, allotype female, Argentina, Buenos Aires prov., Sierra de la Ventana, arroyo Napostá Grande , 38°08′44.2″ S, 62°05′32.7″ W, 300 m, 7 February 2007, F. Díaz, reared in laboratory ( MLPA) GoogleMaps . Paratypes, 10 males, 17 females, as follows: same data holotype GoogleMaps , 3 males, 2 females ( MLPA) , 1 male, 1 female ( BNMH) , 1 female ( USNM) , 1 male, 1 female ( CNCI) ; same data except 19 December 2006, Cazorla- Marino , 1 female, sweep net ( MLPA) ; same data except 7 December 2007, Cazorla- Marino , 2 females, sweep net ( MLPA) ; Saldungaray, arroyo Rivera ; 38°13′53.4″ S, 61°48′01.3″ W, 228 m, 8 February 2007, Marino-Cazorla GoogleMaps , 1 male, 3 females ( MLPA) , 1 male, sweep net ( USNM) . Río Negro prov., Chipauquil ( Pueblo ), 40°57′41.1″ S, 66° 38′20.8″ W, 481 m, 3 December 2006, G. Spinelli GoogleMaps , 1 male, sweep net ( MLPA) ; same data except Puesto Policial , 4 December 2006 , 3 males, 4 females ( MLPA) ; estancia El Rincón , 40°59′24.1″ S, 66°40′35.7″ W, 620 m, 4 December 2006, M. Donato GoogleMaps , 2 males, 2 females, sweep net ( MLPA) .
Material examined by SEM.
Same data as holotype 2 pupae ( MLPA) GoogleMaps .
The specific epithet “ serrana ” is a reference to the type-locality, in the Ventania hills system in the southwestern portion of Buenos Aires province, Argentina.
Dasyhelea serrana is closely related to the clade ( D.pseudolacustris ( D.andensis , D. carlae , D. lacustris , D. macfiei )). This clade is supported by the synapomorphy: “posteromedian projection of female subgenital plate” [character 27 (1)].
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.