Chalarus boyacensis, Ramos-Pastrana & Marques & Rafael, 2023

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 : 385-388

Chalarus boyacensis sp. nov.

( Figs 12–22 , 55 )

Type locality. Colombia: Boyacá: Cabaña Chaina, Santuario de Fauna y Flora Iguaque.

Type material ( 2 JJ). HOLOTYඉE: J, COLOMBIA, Boyacá, SFF[Santuario de Fauna y Flora] / Iguaque, Cab.[Cabaña] Chaina , / 5º25’N / 73º27’W, 2550 m [eters], / 01–14.feb[ II].2001, / A. Roberto leg. M1271 (IavH) (photographed specimen). Holotype with left wing mounted on microslide with Canada balsam. Left antenna and terminalia placed in a microvial with glycerin, both pinned along with the specimen. – PARATYඉE: 1 J, idem ( LEUA).

Diagnosis. Male. Occiput dark brown, gray-brown pruinose. Both surstyli with one protuberance subapically, inward directed, outer margins slightly straight, apices rounded and downward directed; both surstyli with apices truncated and small sinus at junction with epandrium in lateral view. Left gonopod slightly shorter, wider, and with apex more rounded than right one. Tip of distiphallus short with apex hook-shaped and two symmetrical phallic processes, broad and dorsally with setae. Phallus trifid, all ejaculatory ducts situated at apex.

Description. Male (holotype). Body length 2.6 mm. Head ( Figs 12–13 ). Frons with upper 3/4 dark brown, dark brown pruinose, lower 1/4 gray-brown pruinose. Occiput dark brown, gray-brown pruinose. Antenna ( Fig. 14 ) brown, pedicel with two dorsal and two ventral setae; LPP/WPP = 1.5. Thorax ( Figs 13, 15 ). Postpronotal lobe brown, brown pruinose. Scutum dark brown, gray-brown pruinose. Notopleuron and scutellum concolorous with scutum. Mesopleuron brown, gray-brown pruinose. Mediotergite concolorous with mesopleuron. Wing ( Fig. 16 ). Length 2.6 mm. LW/MWW = 2.7; LTC/LFC = 5.1. Membrane brown infuscated. Halter stem dark brown, knob brown. Legs ( Fig. 12 ) entirely dark brown, except tarsomeres 1–4 brown; pulvilli light brown. Abdomen ( Figs 12–13, 17 ) dark brown, gray-brown pruinose, with long setae laterally and short scattered setae dorsally; tergite 1 light brown basally, dark brown posterolaterally; tergites 1–5 with transverse brown pruinose bands; tergite 6 slightly shorter than tergite 5; syntergosternite 8 brown pruinose without long apical setae ( Figs 17–18 ). Terminalia ( Figs 18–22 ). Epandrium and surstyli brown ( Fig. 18 ). Surstyli ( Figs 18–20 ) subsymmetrical and setose, with long setae apically, apices rounded and downward directed; both surstyli with one protuberance subapically on inner margins; outer margins nearly straight ( Fig. 18 ); both surstyli with apices truncated; left surstylus slightly thinner than right one, and with small sinus at junction with epandrium in lateral view ( Figs 19–20 ). Gonopods subsymmetrical; left gonopod slightly shorter, wider, and with apex more rounded than right one ( Figs 19–20 ). Tip of distiphallus short with apex hook-shaped and two symmetrical phallic processes, broad and with setae dorsally ( Fig. 21A ). Ejaculatory apodeme parasol-shaped ( Fig. 22 ). Phallus trifid, with all ejaculatory ducts situated at apex in lateral and dorsal view ( Figs 21A–B ).

Female. Unknown.

Etymology. The specific epithet refers to the region of the type locality, Boyacá, Colombia; adjective.

Habitat. The specimens were collected in the Santuario de Fauna y Flora Iguaque reserve, where the vegetation is composed of forests of the cordillera of the Northeast region.

Geographical distribution. Colombia (Boyacá) ( Fig. 55 ). Taxonomic notes. Chalarus boyacensis sp. nov. runs to C. chilensis Collin, 1931 in couplet 7 of the key presented by RAFAEL (1990). It differs from C. chilensis in having the antenna brown; pedicel with two setae dorsally and two ventrally ( Fig. 14 ) [versus antenna black, pedicel with three setae dorsally and four ventrally in C. chilensis RAFAEL (1988 : Fig. 1 )]; scutum and scutellum dark brown ( Fig. 15 ) (versus scutum and scutellum black); the other different characters can be seen in the key below.

Figures

Figs 12–22. Chalarus boyacensis sp. nov. (IAvH–M1271). Holotype male. 12 – habitus, left lateral view; 13 – habitus, dorsal view; 14 – antenna; 15 – thorax, dorsal view; 16 – wing; 17 – abdomen, dorsal view; 18 – terminalia, dorsal view; 19 – left surstylus and gonopod, lateral view; 20 – right surstylus and gonopod, lateral view; 21a – phallic guide, subapical processes and phallus, left lateral view, 21b – phallus dorsal view; 22 – 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.

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.