Amygdalops curtistylus, ROHÁČEK J., 2008

ROHÁČEK J., 2008, Revision Of The Genus Amygdalops Lamb, 1914 (Diptera, Anthomyzidae) Of The Oriental, Australasian And Oceanian Regions, Acta Zoologica Academiae Scientiarum Hungaricae 54 (4), pp. 325-400 : 356-359

publication ID	https://doi.org/ 10.5281/zenodo.12584953
persistent identifier	https://treatment.plazi.org/id/A2710835-FFA4-8C0A-9B0D-B5F2FB73F928
treatment provided by	Felipe
scientific name	Amygdalops curtistylus
status	sp. nov.

Treatment

Amygdalops curtistylus View in CoL sp. n.

( Figs 72–85 View Figs 72–77 View Figs 78–85 , 167 View Figs 167–170 )

Type material: Holotype male, labelled: “ THAILAND: Mae Fang N.P., over & along a forest brook”, “ Nov. 1, 2004, No. 14, L. Papp & M. Földvári ” ( HNHM, genit. prep., left wing lost) . Paratype: THAILAND: Nan Prov., Mae Charim waterfall, No. 25, over and along rivulet, 7.–8.xi. 2004, 1 female, L. Papp & Földvári leg. ( HNHM, genit. prep.) ; Kamphaeng Phet Prov., Khlong Lan Dist. , nr. Khlong Lan Watf., 16.07.51 N, 99.16.41 E, No. 18, 280 m, secondary forest, 11.–12.xii. 2003, 1 female, P. Schwedinger leg. ( MHNG, genit. prep.) .

Etymology: The species is named “curtistylus ” because of its apically truncated shape of gonostylus.

Description – Male. Total body length 1.87 mm. Body resembling that of A. nigrinotum , darker. Occiput brown, sparsely greyish microtomentose except for bare stripes along posterior margin of eyes. Sides of frontal triangle and top of ocellar triangle with sparse microtomentum. Parafacialia and gena very narrowly brown-margined. Mouthparts dorsally brown including palpus, only proboscis yellow. Cephalic chaetotaxy: vti short, slightly longer than half length of vte; oc slightly longer than vti; 1 relatively short vi (shorter and weaker than oc) and 1 yet weaker subvibrissa (two-thirds of vi); 5–6 small peristomal setulae. Eye subovoid, with longest diameter 1.6 times as long as shortest one. Genal smallest height 0.06 times as long as shortest eye diameter. Antenna as in A. nigrinotum .

Thorax somewhat darker than in A. nigrinotum . Humeral callus yellow, notopleural area ochreous-brown. Thoracic chaetotaxy: 1 prs, reduced to microseta; 2 dc but anterior reduced to a weak setula only twice longer than dc microsetae; laterobasal sc weak but longer than anterior dc. Legs largely dark yellow with pale to whitish yellow coxae and trochanters. f 3 with 6 somewhat thickened and shortened setae in distal third of posteroventral row. Wing ( Fig. 167 View Figs 167–170 ) with pattern as in A. nigrinotum . Cross-vein r-m situated slightly in front of middle of discal (dm) cell. Wing measurements: length 2.20 mm; width 0.69 mm, Cs 3: Cs 4 = 2.10, r-m\dm-cu: dm-cu = 3.42. Haltere with ochreous to pale brown stem and dark brown knob.

Abdomen. Preabdominal terga uniformly dark brown, only T5 with short yellowish anterolateral spot on each side. Preabdominal sterna S3 and S4 distinctly longer than broad; S5 the largest and as long as broad.

Genitalia. Epandrium relatively high ( Figs 72–73 View Figs 72–77 ), with 1 dorsomedial and 1 caudal pair of long and robust setae; anal opening relatively narrow ( Fig. 72 View Figs 72–77 ). Cercus slender, shorter than gonostylus. Medandrium ( Fig. 72 View Figs 72–77 ) of moderate width, dorsally as wide as ventrally, with corners simply rectangular. Gonostylus ( Figs 72–73, 77 View Figs 72–77 ) elongate and slender as in A. cuspidatus but its apex truncated not pointed and with micropubescence covering most of outer side, inner side of gonostylus with longer but fine setae. Hypandrium damaged in holotype ( Fig. 74 View Figs 72–77 ), relatively slender and simple, with small incurved and unpigmented internal lobes; transandrium ( Fig. 75 View Figs 72–77 ) simple, arched, concave ventrally; caudal process (partly broken off in the holotype, see Fig. 75 View Figs 72–77 ) formed by a pair of 2 flat, ventrally widened sclerites. Pregonite ( Fig. 74 View Figs 72–77 ) low, fused with hypandrium, with posterior, ventrally projecting but rounded process carrying about 6 small setae, and with 3 longer setae on anterior simple part in addition. Postgonite ( Fig. 74 View Figs 72–77 ) slender, dark, slightly sinuate, apically pointed, with 1 microseta in distal fourth. Aedeagal part of folding apparatus short ( Fig. 76 View Figs 72–77 ) dark-pigmented and provided with flat polygonal to rounded tubercles (larger ventrally) but without spinulae. Connecting sclerite slender, also dark, curved, finely granulose proximally and tapered distally. Armature of basal membrane unrecognized due to damage, probably with transverse flat spines as are those belateral view (widest extension). Scales: Fig. 77 View Figs 72–77 = 0.05 mm, others = 0.1 mm

tween sclerites of caudal process ( Fig. 75 View Figs 72–77 ). Aedeagal complex ( Fig. 76 View Figs 72–77 ) with slender phallapodeme, having shortly forked base and long apex with distinct lateral projections. Saccus of distiphallus voluminous but not very long, with distinct ventral sclerite and somewhat pigmented basal and middle parts, otherwise membranous, with spines in central part and apical part. Filum of distiphallus long, strongly curved, formed by 2 dark, very slender stripe-like sclerites (basally wider and coalesced, distally separate) ending in membranous finely denticulate apex ( Fig. 76 View Figs 72–77 ). Ejacapodeme not observed, probably very small.

Female. Similar to male unless mentioned otherwise. Total body length 2.14–2.66 mm. f 3 without shortened setae. Cross-vein r-m situated distinctly in front of middle of dm cell. Wing measurements: length 2.42–2.58 mm, width 0.71–0.73 mm, Cs 3: Cs 4 = 1.83–1.90, r-m\dm-cu: dm-cu = 3.62–4.25. Abdomen with T1-T3 completely dark brown, T4-T6 with distinct light yellow anterolateral spot on each side; spots on T4 slightly smaller than those on T5 or T6. S3-S5 about as long as broad but becoming larger and wider posteriorly, consequently S5 larger than S4 but narrower than (postabdominal) S6.

Postabdomen ( Figs 79–80 View Figs 78–85 ). T6 slightly wider than T7, dark brown with distinct yellowish anterolateral spots ( Fig. 79 View Figs 78–85 ). S6 slightly wider than long, of trapezoid shape, pale yellow. T7 dark brown, anteromedially shallowly emarginate, and with semicircular lighter spot and its lateral sides extended on ventral side, reaching up to S7 and embedding 7th spiracles. S7 tapered anteriorly and subcordate, dark brown (darkest in the middle) except for anterior pale area with basal sensillae. T8 dark brown, with only anterolateral margins pale, plate-shaped, relatively broad. S8 dark brown, as wide as S7 but markedly narrower than T8, distinguished by peculiar anterior bare sclerite (= possibly internal sclerites fused to S8) with corners turned up (see Figs 81–82 View Figs 78–85 ). T10 brown, transversely pentagonal, finely microtomentose only around a pair of posteromedial setae. S10 paler than S8, pentagonal but longer than T10, micropubescent posteromedially and near marginal setulae. Internal sclerotization of genital chamber weakly developed (except anterior part of S8 being probably also modified internal sclerites) and pale-pigmented ( Figs 81–82 View Figs 78–85 ), not dilated anteriorly; annular sclerite distinct, thicker than usual and simply bent; vaginal area finely spinulose. Ventral receptacle ( Fig. 85 View Figs 78–85 ) vesiculate, with bent digitiform rather robust terminal projection; receptacular duct relatively slender. Accessory gland ( Fig. 84 View Figs 78–85 ) small, shortly pyriform and with minute stalked globulae on surface; duct ringed, strongly dilated subterminally. Spermathecae spherical, very large, both of almost same size ( Figs 78, 83 View Figs 78–85 ), with minute (almost grain-like) dark spinulae in basal third; duct cervix short and weakly sclerotized. Cerci ( Fig. 79 View Figs 78–85 ) rather robust, longer than in A. cuspidatus or A. nigrinotum , shortly setose.

Discussion – This new species can be recognized from similar species of the A. nigrinotum subgroup only by its brown palpus, male genitalia (e.g. by the apically truncate gonostylus) and female postabdomen (distinctive S7 and S 8 in particular). It is considered to be related to A. pappi sp. n. but this cluster is defined by only a single synapomorphy, the denticulate apex of the filum of the distiphallus ( Fig. 175 View Fig ). Actually, A. curtistylus sp. n. is a rather atypical member of the A. nigrinotum subgroup because the armature of its saccus and shape of the female S7 seem to be intermediate between those of other species of this subgroup and those of the A. cuspidatus subgroup, not to mention the uniquely modified female S8 and the thickened annular sclerite (cf. Figs 81–82 View Figs 78–85 ).

Biology – Both type specimens were swept near a forest brook, in XI.

Distribution – Thailand.

ventral receptacle, lateral view. Scales: Figs 79–80 View Figs 78–85 = 0.1 mm, others = 0.05 mm