Chalarus absonus Rafael, 1990

Ramos-Pastrana, Yardany, Marques, Dayse Willkenia A. & Rafael, José Albertino, 2023, Chalarus (Diptera: Pipunculidae) of Colombia, with description of two new species and an updated key to males of the Neotropical species, Acta Entomologica Musei Nationalis Pragae 63 (2), pp. 383-395 : 385

Chalarus absonus Rafael, 1990

( Figs 1–11 ; 55 )

Chalarus absonus Rafael, 1990: 6 , Figs 1–3 .

Chalarus absonus : JERVIS (1992: 346); DE MEYER (1996): 15; KEHLMAIER & ASSMANN (2010: 12); RODRÍGUEZ & RAFAEL (2012: 10, 16); ROD- RÍGUEZ et al. (2012: 121, Fig. 1c ).

Chalarus spurius chilensis : HARDY (1965): 2 (partim).

Material examined (1 J). COLOMBIA, Boyacá, SFF[Santuario de

Fauna y Flora] / Iguaque, Cab.[Cabaña] Chaina, / 05º25’N / 73º27’W,

2250 m [eters], / 01–14.feb[ II].2001, / A. Roberto M1271 (1 J IavH)

(photographed specimen).

Diagnosis. Male. Pedicel with two setae dorsally and two ventrally. Hind tibia with one stout seta medially. Surstyli with apices rounded, with medial lobes on inner margins, right surstylus with small medial lobe on outer margin; both surstyli with small sinus at junction with epandrium; right surstylus in lateral view with lower margin longer and more acute than left one. Left gonopod thinner than right one. Tip of distiphallus short and slightly rounded, with two phallic processes, one thinner and reaching only about half length of the other. Phallus trifid, all ejaculatory ducts situated at apex.

Intraspecific variability. We provide a comparison of the variations between the Colombian and Brazilian specimens (between parenthesis, when comparable). Male. Head ( Figs 1–2 ). Occiput brown, gray-brown pruinose. Antenna ( Fig. 3 ) brown; pedicel with two setae dorsally and two ventrally. Thorax ( Figs 2, 4 ). Notopleuron brown, brown pruinose. Mediotergite brown, gray-brown pruinose. Wing ( Fig. 5 ). Length 2.7 mm, width 1 mm. Membrane brown infuscated; pterostigma occupying 2/3 of third costal section (versus pterostigma occupying 1/2 of third costal section). Halter brown. Legs ( Fig. 1 ) entirely dark brown, brown pruinose, except pulvilli light brown. Abdomen ( Figs 1–2, 6 ). Tergite 1 light brown basally, dark brown posterolaterally; tergite 6 shorter than tergite 5; syntergosternite 8 brown, gray-brown pruinose, with long apical setae ( Figs 6–7 ). Terminalia ( Figs 7–11 ). Epandrium and surstyli brown ( Fig. 7 ). Surstyli ( Figs 7–9 ) subsymmetrical, completely setose and apices rounded, directed downward; both surstyli with medial lobes on inner margins; right surstylus with small medial lobe on outer margin ( Fig. 7 ); right surstylus in lateral view with lower margin longer and more acute than left one ( Figs 8–9 ). Gonopods subsymmetrical; left gonopod thinner than right one ( Figs 8–9 ). Tip of distiphallus short and slightly rounded, with two phallic processes, one thinner and reaching only about half length of the other ( Fig. 10A ). Ejaculatory apodeme parasol-shaped ( Fig. 11 ). Phallus trifid, all ejaculatory ducts situated at apex in lateral and dorsal view ( Figs 10A–B ).

Habitat. The specimen was collected in the Santuario de Fauna y Flora Iguaque reserve, where the vegetation is composed of cloud Andean forests of the Cordillera of the Northeast region of Colombia.

Geographical distribution. Argentina (Tucumán, Las Tipas) (RODRÍGUEZ et al. 2012), Brazil (São Paulo, Paraná) ( RAFAEL 1990), Colombia (Boyacá) (new record) ( Fig. 55 ).

Figures

Figs 1–11. Chalarus absonus Rafael, 1990 (IAvH–M1271). Male. 1 – habitus, left lateral view; 2 – habitus, dorsal view; 3 – antenna; 4 – thorax, dorsal view; 5 – wing; 6 – abdomen, dorsal view; 7 – terminalia, dorsal view; 8 – left surstylus and gonopod, lateral view; 9 – right surstylus and gonopod, lateral view; 10a – phallic guide, subapical processes and phallus, right lateral view, 10b – phallus dorsal view; 11 – ejaculatory apodeme.

Fig. 55. Geographical records of Chalarus species in Colombia. Chalarus absonus Rafael, 1990, C. boyacensis sp. nov., C. chairensis sp. nov., C. connexus Rafael, 1988, and C. delicatus Rafael, 1990.