Fannia hennigi, Gomes & Couri & De Carvalho, 2018

Gomes, Lucas R. P., Couri, Márcia S. & De Carvalho, Claudio J. B., 2018, Anthomyiidae, Fanniidae and Muscidae (Diptera) from the Juan Fernández Archipelago (Chile): 60 years after Willi Hennig’s contributions, Zootaxa 4402 (2), pp. 373-389 : 379-382

Fannia hennigi sp. n.

( Figs. 8 ; 18–23)

Diagnosis: Fannia hennigi sp. n. belongs to the canicularis group ( canicularis , petrocchiae and pusio subgroups) ( Albuquerque et al. 1981), which is characterized by the absence of the bacilliform process. Fannia hennigi sp. n. can be differentiated from species of canicularis group by ciliated eye.

General coloration of body dark brown; antenna, palpus and proboscis dark brown; legs yellow except fore femur and tarsomeres dark brown; hind coxa with 1 weak seta on posterior margin; hind femur with strong row of setae on anteroventral, anterodorsal and posteroventral surfaces (setae near the apex are longer); hind tibia with one preapical and one submedian seta on dorsal surface, one submedian anterodorsal seta, one median, one submedian and one apical seta on anteroventral surface (the submedian twice the length of the median), posteroventral and ventral surfaces without setae.

Description (holotype): Male. Length: Body: 5.2 mm; Wing: 4.5 mm. General coloration of the body (head, thorax, abdomen, fore femur and tarsomeres) dark brown, contrasting with fore and mid tibia, hind femur and tibia yellowish. Head: holoptic; eyes with short and sparse cilia; distance between eyes on antennal insertion 0.16 mm; antenna, palpus and proboscis dark brown; arista bare and enlarged on the base; antenna not reaching epistoma; frontal setae with 10 pairs; flagellomere with about three times the pedicel length; palpus filiform; parafacial and fronto-orbital plate bare ( Fig. 18 ).

Thorax: acrostichal setae 3+4, rows misaligned; dorsocentral setae 2+3, the last one the most developed; postpronotal lobe with two setae of similar length of the anterior notopleural; notopleuron with two setae without covering setulae; two prealar setae weak; one supra-alar seta; scutellum yellow apically, with a pair of long apical and basal setae and a short preapical pair; calypters white with border yellow; proepisternum with 2 strong upward directed setae; proepimeron with two strong upward directed seta, with covering setulae; anepisternum with a row of 5 long setae, associated with posterior weaker setae; katepisternal setae 1+1; halter yellow.

Legs: legs yellow, except fore femur (apex yellowish) and tarsomeres dark brown ( Fig. 19 ); fore tarsomere with discrete yellowish spots on apex ventrally; fore tibia with a dorsal preapical seta and an apical posteroventral and ventral seta; mid femur with a row of anteroventral and posteroventral setae (both with setae placed nearer each other on preapical region, separated by a space similar to the thickness of the setae); mid tibia with constriction on basal region, with a preapical anterodorsal and anteroventral seta, one submedian posterior seta, one apical posteroventral, ventral and anteroventral setae; hind coxa with one weak seta on posterior margin ( Fig. 8 ); hind femur with a strong row of setae on anteroventral, anterodorsal and posteroventral surface (setae near to the apex are longer), two apical setae on dorsal surface; hind tibia with two dorsal setae (one preapical and one submedian), one submedian anterodorsal seta, one submedian anterior seta, and three anteroventral setae (one median, one submedian and one apical, the submedian twice the length of the median seta), and posteroventral and ventral surfaces without setae ( Figs. 24, 25 ).

Wing: hyaline, with only the C vein ciliated.

Abdomen: Elongate, in general with developed setae; syntergite 1+2 black and setulose laterally; tergites completely black, with weakly greyish pruinose, forming inconspicuous lateral spots (except the 5th); chaetotaxy: tergite 3 with 3 pairs of lateral setae, tergite 4 with 3 pairs of lateral setae (the middle one longer than the others), tergite 5 with 6 pairs of lateral setae (2 medial and 4 apical), these setae about twice the length of the others covering setae ( Fig. 21 ); sternite 1 setulose.

Terminalia: Sternite 5 quadrangular, covered with setae on posterior margin ( Fig. 26 ); epandrium yellowish, slightly wider than long, with developed setae, stronger on basal half ( Figs. 27, 28 ); cercal plate fused V-shaped, about 2/3 the surstylus length, with long and upright setae throughout entire structure; bacilliform process absent; surstylus long and simple, apical region narrower than base, articulated with epandrium, pointed with long and weak setae on inner margin; hypandrium and associated structures as in Fig. 29 (hypandrial arms outwards directed and expanded at apex; postgonite small; aedeagus membranous).

Female (n=23) ( Figs. 22, 23 ): Length: Body: 4.4–5.6 mm; Wing: 4.0– 5.2 mm. Similar to male, except for the following: dichoptic (distance between eyes on antennal insertion= 0.48–0.52 mm); a pair of fronto-orbital setae reclined; parafacial with grey pruinosity and presence of a row of small setae between frontal setae and the eye margin; postpronotal lobe weakly yellowish; mid tibia without basal constriction on ventral surface; legs (except tarsomeres black) and abdomen mostly yellow. Some specimens with general body coloration darker yellow, mainly thorax, legs and abdomen. Hind coxa of some specimens without setae on posterior margin. Terminalia ( Figs. 30–32 ): Sternite 8 reduced to two small setulose plates and a small slender plate anteriorly. Two spermathecae pear-shaped and smooth-surfaced.

Type material: Holotype male. “ CHILE: JuanFernandezIslands/ Robinson Crusoe Island /pans in Intermittent / stream bed above Plazoleta / 1–9.I.1993, S. A. Marshall ” . Paratypes: 1 male. “ CHILE: JuanFernándezIslands/ Robinson Crusoe Island / Upper El Yunque trail fern forest, pan traps / 1–9.i.1993, S. A. Marshall ” ; 2 females. “ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \ 1–10.i.1993; malaise\Mirador de Selkirk \ S.A. Marshall ” ; 2 females. “ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \20 pans, Quebrada on S.\side of Mirador, fern\forest; 1–10.i.1993 \ S.A. Marshall ” ; 3 females. “ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \malaise in open forest\above Plazoleta \ 1–9.i.1993 \ S.A. Marshall ” ; 1 female. “ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \malaise, fern forest\'' El camote'', upper El \ Yunque Trail, 1– 9.i.1993 \ S.A. Marshall ” ; 1 female. “ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \pans in intermittent\stream bed above Plazoleta \ 1-9.i.1993; S.A. Marshall ” ; 1 female. “ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \pans, top of Mirador \ 1-10.i.1993; S.A. Marshall ” ; 1 female.

“ CHILE: JuanFernandezIsland\ Robinson Crusoe Island \ Plazoleta trail sweep\ 1–8.i.1993; S.A. Marshall ”; 3 females . “ CHILE: JuanFernandezIslands\ Robinson Crusoe Island \ Plazoleta - El Yunque \ 23-28.i.1992 \ S. A. Marshall ”; 9 females . “ CHILE: JuanFernandezIslands\ Robinson Crusoe Island \pans near Plazoleta \open forest; 1– 9.i.1993 \ S.A. Marshall ”.

Distribution: Juan Fernández Archipelago ( Chile).

Etymology: Name in apposition. The specific epithet is in honor of Willi Hennig, a German dipterist who made enormous contributions to dipterology and phylogenetic systematics in general.

Comments: Hennig (1955) studied three females of Fannia (from Robinson Crusoe and Alejandro Selkirk Islands) that he did not describe. He listed some characters for them: head, antenna and palpus black, halter and legs yellow (only tarsomeres black); hind coxa with setae on posterior margin; abdomen reddish-brown. These characters are similar to the condition found in Fannia hennigi sp. n. Also, Hennig (1957) listed 11 specimens as belonging to a new species of Fannia that he did not describe.

Figures

FIGURES 1–11. Anthomyia limbinervis (Macquart, 1843): (1) scutellum with pale cilia ventrally (black arrow); (2) wing, ventral view; (3) costal vein ciliated ventrally, ventral view; Delia platura (Meigen, 1826): (4) male, hind femur, posterior view; (5) wing, ventral view; (6) costal vein bare ventrally, ventral view; Fannia anthracina (Walker, 1836): (7) wing, ventral view, subcostal sinuous (white arrow), vein A 2 strongly curved (black arrow); Fannia hennigi sp. n.: (8) male, coxa ciliated, posterior surface (blackarrow); Lispoides insularis Hennig, 1957:(9) abdomen, lateral view, katepisternum 2+1 (white arrow), lower calypter twice as long as upper one (blackarrow); Notoschoenomyza kuscheli Hennig, 1955: (10) abdomen, lateral view, katepisternum 1+1+1 (white arrow), calypters with similar length (black arrow); Syllimnophora lispomima Hennig, 1955: (11) female, head, lateral view.

FIGURES 18–23. Fannia hennigi sp. n., male holotype: (18) head, anterior view; (19) lateral view; (20) dorsal view; (21) male abdomen, posterior view; female paratype:(22) head anterior view; (23) lateral view. Scale: 0.5 mm.

FIGURES 24–32. Fannia hennigi sp. n., paratype male: (24) hind leg, anterior view; (25) hind leg, posterior view; (26) sternite 5, dorsal view; (27) epandrium, cercal plate and surstyli, dorsal view; (28) epandrium, cercal plate and surstyli, lateral view; (29) hypandrium and associated structures, dorsal view. Female:(30) spermathecae; (31)terminal segments of abdomen, dorsal view; (32) terminal segments of abdomen, ventral view.