Maia, Proença & Maia, 2021

Proença, Barbara & Maia, Valéria Cid, 2021, New genus and species of Schizomyiina (Diptera, Cecidomyiidae) from Brazil, Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 61, pp. 1-9 : 3-7

Proença & Maia

Description: Adult: Body length: 1.80-2.70 mm in males (n = 4); 3.50-4.10 mm in females (n = 5). Head ( Fig.2 ): eyes join one another at the vertex, facets circular, all closely approximated; antenna 2 + 12, scape obconical with 4-6 setae, 1.32 times longer than pedicel (n = 5); pedicel glo- bose with 4-6 setae (n = 5); male flagellomeres subequal in length, last female flagellomere shorter, with setae. Flagellomeres neck ( Figs. 3 and 4 ) with a single row of setulae in male and bare in female, circumfila reticulat- ed in both sexes. Frontoclypeus with 7-12 setae (n = 5). Labrum long, ending slightly after the hypopharynx,narrowed to apex, with two setae (n = 5). Hypopharynx triangular, setulose apically (n = 5). Labella with eight short mesal setae (n = 5). Palpus with one or two segments, claviform, second segment three times as long as the first one. Thorax ( Fig. 5 ): wings 1.5-1.7 mm long in males (n = 6) and 2.1-2.6 mm long in females (n = 7). Scutum with two rows of dorsal setae, highly concentrated at the anterior margin, forming a double row up to the end of the scutum; no lateral rows. Scutelum bare; anepimeron with many setae. Other pleural sclerites bare. Legs ( Fig. 6 ): tarsal claws simple, strongly sclerotized, bent slightly before its midlenght. Empodium setulose, short, not reaching bend in claws.

Male abdomen ( Fig. 7 ): tergites and sternites rectangular with rounded margins. Trichoid sensillae absent. Tergites 1-7 sclerotized with complete posterior row of setae, sparse lateral setae and scales elsewhere. Tergite 8 not sclerotized, bare, appreciably shorter and narrow- er than tergite 7. Sternites 2-6 sclerotized, with setae more abundant at midlenght, many lateral setae, complete posterior row of setae, and elsewhere with scales. Sternites 7-8 sclerotized, covered with setae and scales. Sternite 8 shorter than other sternites.

Male terminalia ( Fig. 8 ): gonocoxites triangular, robust, wider than long. Gonostylus semicircular, with setae and scales. Cerci with deep triangular lobes, with setae. Hypoproct narrow, triangular, setulose, rough basally, with slight reentrance in the middle at the apex, with two apical setae. Aedeagus wide, cylindrical. Parameres short, trapezoid with two apical setae.

Female abdomen ( Fig. 9 ): Tergites and sternites without trichoid sensillae.Tergite 1-8 sclerotized,tergites 1-7 rectangular, tergite 1 with complete posterior row of setae, tergites 2-7 with rounded margins, complete posterior row of setae,scales elsewhere.Tergite 8 rectangular,with rounded margins, shorter than the others,with complete posterior row of setae and scales elsewhere. Sternites 2-7 sclerotized, rectangular, with setae more abundant at midlenght, several lateral setae, complete posterior row of setae and scales elsewhere. Sternite 8 not sclerotized, with a membranous area covered with spine-like projection of the tegument.

Ovipositor ( Fig. 10 ): soft, protrusible, 1.26-1.75 times as long as sternite 7, striated at basal half, distal half with long ventral and dorsal setae and sclerotized ventrally. Cerci distinct, fused, with short setae apically.

Pupal exuvia ( Figs. 11-14 ): Body length: 2.80-4.20 mm (n = 4). Sclerotized integument. Cephalic region ( Fig.11 ): Antennal horns short, 0.02-0.03 mm long (n = 6), simple,

triangular. Antennal sheath with 3-4 setae near antennal horns ( Fig.12 ). Upper cephalic margin thickened laterally. Cephalic region with rough tegument at the lower area, above the palpus sheath and above the labrum sheath. Apical papillae asetose; lateral and lower facial papillae not visible. Thorax ( Fig. 11 ): Tegument rough along the ecdysial line. Prothoracic spiracle digitiform, short, 0.06-0.10 mm long (N = 5). Wings sheath reaching midlength of abdominal segment III; forelegs sheath reaching midlength of abdominal segment VI; midlegs sheath reaching posterior margin of abdominal segment VI; hindlegs sheath reaching midlenght of abdominal segment VII. Abdomen: Spiny integument, dorsally striated at the posterior margin. Dorsal spines absent. Terminal segment with two apical lobes only in male and female terminal segment rounded ( Figs. 13 and 14 ).

Third instar larva ( Figs. 15-18 ): Body length: 2.20-2.50 mm (n = 5). White, spiny integument, cylindrical body ( Fig. 15 ). Sternal papillae setose. Spatula well sclerotized, 0.4-0.7 mm long, with two triangular teeth, approximate to each other. Spatula shaft long, truncate basally (shaft 4.5-5.7 times as long as teeth) ( Fig. 16 ) or with two lateral projections resembling an anchor (shaft 7.0-8.3 times as long as teeth) ( Fig. 17 ). One setose lateral papilla on each side. Terminal segment rounded, with a pair of terminal papillae, with setae subequal in length ( Fig. 18 ).

Figures

Figures 2-8. Distinctamyia matogrossensis Proença & Maia. (2) male head (frontal view) with 2-segmented palpus. In detail: one-segmented palpus; (3) male flagellomere V; (4) female flagellomereV;(5) male wing;(6) female hind leg:claws and empodium (lateral view);(7) male abdomen,segments 6-8 (lateral view); (8) male terminalia(dorsal view).

Figures 9-12. Distinctamyia matogrossensisProença & Maia.(9) female abdomen,segments 6-8 (lateral view);(10) ovipositor (lateral view).In detail,female cerci dorsolateral view;(11) pupal exuviae:cephalic region and prothoracic spiracle (frontalview);(12) pupal exuviae:antennal horn.

Figures 13-18. Distinctamyia matogrossensis Proença & Maia. (13-14) sexual dimorphism on pupal exuviae:(13) male’s pupal exuvia: terminal segment (ventral view);(14)female’s pupal exuvia:terminal segment (ventral view);(15) larva,general aspect (ventral view);(16-17)larval spatula:(16)truncated shaft and lateral papillae (ventral view);(17) shaft with basal lateral projections and lateral papillae (ventral view);(18) larva:terminal segments (ventral view).