Peradon angustiventris (Macquart)

Reemer, Menno, Skevington, Jeffrey H. & Kelso, Scott, 2019, Revision of the Neotropical hoverfly genus Peradon Reemer (Diptera, Syrphidae, Microdontinae), ZooKeys 896, pp. 1-93 : 1

Peradon angustiventris (Macquart) Figs 39 , 130 , 131 , 149 , 150 , 275

Aphritis angustiventris Macquart, 1855: 105. Holotype ♂: South America (OUMNH) [examined].

Microdon angustiventris (Macquart): Thompson et al. 1976: 63.

Peradon angustiventris (Macquart): Reemer and Ståhls 2013a: 145; Reemer 2014: 42.

Studied type specimens.

South America • 1 ♂, holotype of Aphritis angustiventris Macquart; OUMNH.

Label 1 (small, round, red-bordered): "Holo- / type"; label 2: "A. angustiventris / Ex coll. Bigot"; label 3: " Aphritis / angustiventris / [male sign] Macq.". Coll. OUMNH.

Additional specimens.

Brazil • 1 ♂; Amapá, Oiapoque Rancho Km-9, Varredura; 03°47'53"N, 51°48'03"W; 15 Nov. 2014; J.A. Rafael & F.F. Xavier leg.; INPA • 1 ♀; Amazonas, Barcelos, Rio Demeni, Pirico; 0°19'30"S, 62°47'21"W; Aug. 2008; A. Silva & R. Machado leg.; INPA • 1 ♂; Manaus; Aug. 1959; C. Elias leg.; UFPR • 1 ♂; R. Ducke; 23 Mar. 1982; J.A. Rafael leg.; INPA • 1 ♀; Amazonas, Manaus, AM010 km 50; 02°44'13"S, 59°54'32"W; 5-8 Feb. 2005; F.F. Xavier & G.M. Lourido leg.; (INPA) • 1 ♂; Novo Airão, AM 352, Ramal Km 10; 02°42'56.5"S, 60°56'26.7"W; 28-29 Aug. 2011; J.A. Rafael, D. Takiya & J.T. Câmara leg.; INPA • 1 ♂; Novo Airão, AM 352, Ramal Km 10; 02°42'56.5"S, 60°56'26.7"W; 29 Aug. 2011; J.A. Rafael, D. Takiya & J.T. Câmara leg.; INPA • 1 ♂; Novo Airão, AM 352, Ramal Km 10; 02°42'56.5"S, 60°56'26.7"W; 29-30 Aug. 2011; J.A. Rafael, D. Takiya & J.T. Câmara leg. (INPA) • 1 ♂; Faz. Taperinha, prox. Santarem, PA; 29 Dec. 1967-9 Jan. 1968; Exp. Perm. Amaz. leg.; MZUSP • 1 ♂; Rondonia, 62 km SE Ariquemes; 5-16 Nov. 1996; W.J. Hanson leg.; LACM.

Ecuador • 1 ♂; Napo, Tena.; 500 m a.s.l.; 11-28 Apr. 1976; M. Cooper leg.; NHMUK ("B.M. 1976-290").

Guyana • 1 ♂; Bartica; 11 May 1901; CNC • 1 ♂; Kartabo; Sep. 1922; M.D. Haviland leg.; NHMUK.

Suriname • 1 ♀; Republiek; 30 May 1963; P.H. van Doesburg Jr. leg.; RMNH • 1 ♂; Zanderij; 11 May 1963; P.H. van Doesburg Jr. leg.; RMNH • 1 ♂; Colakreek; 9 Mar. 2006; M. Reemer leg.; RMNH • 1 ♂; Colakreek; 30 Mar. 2006; M. Reemer leg.; RMNH.

Diagnosis.

Body length: male 12-15 mm, female 14-16 mm. A large species with elongate, not constricted abdomen. Tergites 2 and 3 are yellowish brown, while tergite 4 may be orange brown or dark brown. The wings are yellow anterobasally, the fascia of golden pile along the mesonotal transverse suture is complete (not interrupted medially), and the face is entirely yellow. Male genitalia as in Fig. 275 .

Notes.

In the present concept, this species only differs from P. luridescens by tergite 3 being largely yellowish instead of dark brown. Several specimens of both P. angustiventris and P. luridescens are represented in material from Suriname in the RMNH collection (see images in Reemer 2014), and these specimens fall into two discrete groups based on this character (tergites 3 and 4 entirely yellowish brown in P. angustiventris , tergites 3 and 4 blackish brown in P. luridescens ). In Suriname, P. angustiventris and P. luridescens do not seem to co-occur, with P. angustiventris found in the savannah areas of the old coastal plain (localities Colakreek, Republiek, Zanderij), and P. luridescens in the bauxite containing plateaus in the interior at higher elevation (Brownsberg, Nassau Mts., Lely) ( Reemer 2014). However, specimens which could be considered intermediates are known from other countries. In these specimens, tergite 3 is yellowish brown whereas tergite 4 is blackish brown. Here, such specimens are preliminarily assigned to P. angustiventris , because they agree with the type specimen in colouration of tergite 3. This preliminary solution is unsatisfactory, as colouration of the abdomen is variable in these intermediate specimens. Possibly, the intermediates represent a third species or even a species complex, but there are too few specimens available to make a decision on this. Another possibility is that P. angustiventris and P. luridescens are the extreme ends of one highly variable species, but the fact that specimens from within one country (Suriname) can clearly be assigned to two different groups without significant character variation is here taken as a clue that this is not the case. The results of analyses of the barcodes of a few specimens do not shed light on this matter.

Distribution.

Known from the Brazilian Amazon region, Ecuador, Guyana, and Suriname.

Figures

Figures 36 - 47. 36 - 46 Wings of Peradon species of the bidens - group: 36 P. bidens ♂ Suriname RMNH 37 P. bispina ♂ holotype 38 P. aurifascia ♂ holotype 39 P. angustiventris ♂ Suriname RMNH 40 P. angustus ♀ neotype 41 P. flavipennis ♀ holotype 42 P. normalis var. SUR- 17 B ♀ Suriname RMNH 43 P. normalis typical var. ♀ Suriname RMNH 44 P. pompiloides ♂ holotype 45 P. pompiloides ♀ paratype 46 P. niger ♂ holotype 47 Wing of P. palpator ♂ holotype (flavofascium group)

Figures 129 - 135. Dorsal habitus of Peradon species (bidens group) 129 P. angustus ♀ neotype 130 P. angustiventris ♂ Suriname RMNH 131 P. angustiventris ♀ Brazil Manaus INPA 132 P. luridescens ♂ Suriname RMNH 133 P. luridescens ♀ Suriname RMNH 134 P. aurifascia ♂ Brazil CSCA 135 P. aurifascia ♀ Brazil MZUSP. Scale bar: 10 mm.

Figures 149, 150. Peradon angustiventris male, holotype 149 habitus dorsal 150 habitus lateral.

Figures 274 - 279. Male genitalia of Peradon species 274 P. luridescens Suriname RMNH 275 P. angustiventris Suriname RMNH 276 P. palpator holotype 277 P. flavofascium holotype 278 P. surinamensis holotype 279 P. notialus holotype.