Amygdalops undulatus, Jindr & Rohác & ek, 2004

Jindr, Rohác, ich & ek, 2004, Revision of the genus Amygdalops Lamb, 1914 (Diptera: Anthomyzidae) of the Afrotropical Region, African Invertebrates 45, pp. 157-221 : 203-207

publication ID	https://doi.org/ 10.5281/zenodo.7666648
persistent identifier	https://treatment.plazi.org/id/03EE879C-FF80-2A08-B5FC-FB891292FC34
treatment provided by	Felipe
scientific name	Amygdalops undulatus
status	sp. nov.

Treatment

Amygdalops undulatus View in CoL sp. n.

( Figs 99–109 View Figs 99–103 View Figs 104–109 , 131 View Figs 129–132 )

Type material: Holotype male, labelled: ‘Mandraka, ca 19ºS 48ºE, 11–13.x.1987, SFMcE. JRD. SA’ ( AMSA, genit. intact) . Paratypes: MADAGASCAR: same data as for holotype, 2 males 2 females; Andasibe , ca 19ºS 48ºE, 13–15.x.1987, 2 males, SFMcE, JRD, SA leg. ( AMSA, most with genit. prep.) .

Etymology: The species is named ‘undulatus’ (= Lat. wavy) because it has wing with strongly sinuous radial veins.

Description: The species is very close to A. sparsus sp.n. but more resembles A. obscurior sp.n. in some outer, mainly colour features.Therefore only differences against A. sparsus sp.n. are mentioned below.

Total body length 1.86–2.30 mm.

Head: As long as or slightly longer than high. Frons anteriorly paler yellow. Face yellowish ochreous and mouthparts including palpus yellow. Cephalic chaetotaxy as in A. sparsus sp.n. Eye with longest diameter 1.4 times as long as shortest one. Smallest height of gena 0.09 times as long as shortest eye diameter. Antenna distinctly paler yellow and also darker parts of pedicel and 1st flagellomere at most pale ochreous. Arista 1.8 times as long as antenna.

Thorax: With brown notopleural area but humeral callus distinctly lighter, ochreous to pale brown. Thoracic chaetotaxy as in A. sparsus sp.n., including strongly reduced anterior dc macroseta. Legs yellow, only f 3 with brown darkened distal third, thus similar in colour to those of A. obscurior sp.n. Chaetotaxy of legs as in A. sparsus sp.n. Wing ( Fig. 131 View Figs 129–132 ) most similar to that of A. sparsus sp.n., including strongly sinuous R 2+3 and R 4+5 but area in front of the anterior white spot lighter, almost as in A. obscurior sp.n. Wing measurements: length 2.06–2.42 mm; width 0.63–0.73 mm, Cs 3: Cs 4 = 2.38– 2.63, r-m\dm-cu: dm-cu = 2.73–3.40. Haltere with yellow stem and blackish brown knob.

Abdomen: As in A. sparsus sp.n., but S5 slightly more transverse and with deeper posterior emargination. Postabdominal sterna S6–S8 highly similar to those of A. sparsus sp.n.

Genitalia: Larger than in A. sparsus sp.n. Epandrium hemispherical, medium-long ( Figs 99, 100 View Figs 99–103 ), with denser and thicker setae, two or three pairs of them slightly longer than others; anal opening small, rounded pentagonal ( Fig. 99 View Figs 99–103 ). Cerci medium-long, more projecting ventrally and more separate each from other. Medandrium ( Fig. 99 View Figs 99–103 ) comparatively high but narrower than in A. sparsus sp.n. Gonostylus ( Fig. 102 View Figs 99–103 ) shorter (compared to epandrium) than in A. sparsus sp.n., elongately subtriangular (in widest extension view), with concave anterolateral margin, not very acute; micropubescence covering most of outer side as in A. sparsus sp.n.; inner side with more and longer setae than in A. sparsus sp.n. (see Fig. 100 View Figs 99–103 ). Hypandrium ( Fig. 104 View Figs 104–109 ) very similar to that of A. sparsus sp.n., with smaler membranous internal lobes; transandrium ( Fig. 101 View Figs 99–103 ) posteromedially simple, straight; caudal process formed by two pale sclerites which are proximally fused each to other and to transandrium, and ventrally strongly bent anteriorly, with distal part somewhat sinuous (see Fig. 104 View Figs 104–109 ). Pregonite ( Fig. 104 View Figs 104–109 ) protruding ventrally as in A. sparsus sp.n., but with distinctly longer setae arranged in two groups, 4 longer on anterior bulge, 3 shorter on posterior projection. Postgonite ( Fig. 104 View Figs 104–109 ) very slightly sinuous, slender, with membranous bidentate apex, small setula in basal third anteriorly and several sensilae on outer surface as usual; basal sclerite attached to postgonite large, pale pigmented, longer than in A. sparsus sp.n. Aedeagal part of folding apparatus attached to base of phallapodeme ( Fig. 103 View Figs 99–103 ) darkened dorsally, provided by dense, flat, granulose tubercles; connecting sclerite very slender and pale pigmented, finely granulose.Basal membrane without spines or tubercles as in A. sparsus sp.n. Aedeagal complex ( Fig. 103 View Figs 99–103 ) highly similar to that of A. sparsus sp.n., differing only in thicker spines on saccus of distiphallus and distinctly dentate apex of filum.

Female differs from male as follows:

Total body length 2.34–2.62 mm.

Antenna (1st flagellomere in particular) somewhat darker but face as pale as in male. Palpus paler brown than in A. sparsus sp.n. Humeral callus ochreous to ochreous brown. Wing measurements: length 2.46–2.58 mm, width 0.73–0.78 mm, Cs 3: Cs 4 = 2.21– 2.30, r-m\dm-cu: dm-cu = 2.70–3.06.Abdomen as in A. sparsus sp.n. but having wider, less elongate S3–S5 which are about as long as wide.

Postabdomen ( Fig. 105, 108 View Figs 104–109 ) resembling that of A. sparsus sp.n. with differences as follows. S6 only slightly wider than S5 and about as wide as T7 anteriorly ( Fig. 108 View Figs 104–109 ), thus distinctly narrower and less transverse than that of A. sparsus sp.n. T7 narrow but less tapered posteriorly, with anteroventral corners fused ventrally with anterior part of S7. S7 as in A. sparsus sp.n. but more dilated posteriorly and fused with T7 anteriorly. T8 small, plate-shaped, more transverse than that of A. sparsus sp.n. and S8 slightly wider. T10 and S10 as in A. sparsus sp.n. Internal sclerotisation of genital chamber with flat but crooked posterior sclerites (seemingly single but actually two, largely fused together on each side), very fine medial ribbon-like structure (see Fig. 107 View Figs 104–109 ) and transverse, strongly twisted, unpigmented anterior ring-shaped structure ( Fig. 107 View Figs 104–109 ), better developed than in A. sparsus sp.n. Genital opening surrounded by fine dense spines. Ventral receptacle ( Fig. 106 View Figs 104–109 ) membranous, formed by oval, transversely ringed pouch on narrow proximal tube and digitiform, ventrally directed, terminal projection. Spermathecae 1+1 ( Fig. 109 View Figs 104–109 ), spherical, both of the same size, each with small and fine blunt spines inserted on basal third of spermatheca; duct cervix well developed, mediumlong. Cerci distinctly more robust than in A. sparsus sp.n.

Discussion: A. undulatus sp.n. is a Madagascan sister-species of A. sparsus sp.n. It differs from the latter species by somewhat larger size, yellow male palpus, only hind femur with brown distal annulus and by some details of the male genitalia (slightly different and longer setose gonostylus, long setae on pregonite, strongly sinuously bent caudal process of transandrium etc.) and female postabdomen (S6 markedly narrower and less transverse, S7 anteriorly fused with T7 and posteriorly more dilated, cercus more robust).

Biology: All type specimens were collected in October.

Distribution: Madagascar.