Schizomyia tuiuiu Urso-Guimarães & Amorim, 2002

Urso-Guimarães, Maria V., 2019, Description of the male and larva of Schizomyia tuiuiu Urso- Guimarães & Amorim (Diptera, Cecidomyiidae), new records and a key to Neotropical species of Schizomyia Kieffer, Iheringia, Série Zoologia (e 2019017) 109, pp. 1-6 : 2-4

Schizomyia tuiuiu Urso-Guimarães & Amorim, 2002

( Figs 1-12 )

Schizomyia tuiuiu URSO-GUIMARÃES & AMORIM, 2002:568

Description. Male. Wing 2.0 mm long, 0.4 mm wide (N=2). Color: light and dark-banded flagellomeres ( Fig. 1 ) and legs; thorax brown; wing veins covered with dark brown scales and setae, wing membrane hyaline; legs and abdomen covered with dark brown scales and setae, tergites and sternites brown, non-sclerotized areas orange. Head ( Fig. 1 ). Eye holoptic, facets hexagonal, closely adjacent, eye bridge 9 facets long, occiput brown with long hairs; occipital protuberance absent. Antenna with scape rectangular, pedicel rounded, 12 flagellomeres, cylindrical, necks bare; all approximately the same length, light basally and dark distally; circumfila sinuous ( Fig. 2 ). Frontoclypeus with 19 setae; labella hemispherical in frontal view, completely setose distally; palpus 4-segmented, first and second segments equally long, third longer, fourth longest, all cylindrical, setae number and position as in Figure 3 .

Thorax. Wing blade hyaline, veins covered with scales and setae ( Fig. 4 ). Antepronotal lobe bare. Scutum and scutelum dark brown, completely fused, scutum with three rows of dorsocentral setae, scutelum with row of macrosetae, anepistern with 40 setae, anepimeron with 19 macrosetae, katepistern and mediotergite bare; laterotergites with two trichoid sensila at halter base. Legs with first tarsomere without apicoventral spur ( Fig. 5 ); tarsal claws without tooth in all legs, bent beyond midway apex, empodia as long as claws ( Fig. 6 ).

Abdomen. Tergites and sternites rectangular except for tergite 8 that is narrow; tergites and sclerites 2–7 with posterior line of strong setae, completely covered with scales, and a pair of trichoid sensilla anteriorly (except for sternite 2).

Terminalia ( Fig. 7 ). Gonocoxites oblong, completely covered with setae and microsetae, with large ventro-apical lobe exceeding insertion of gonostylus; gonostylus inserted dorsally, gonostylus rectangular with a projection in ventral portion of apex and a dorso-apical row of strong spines partially fused at base in dorsal portion of apex; cerci as long as hypoproct; hypoproct bilobed, narrow, setose, shorter than aedeagus; parameres short, round, setose; aedeagus narrow-triangular, strongly sclerotized, tapering gradually toward apex, round at apex.

Complementary description of pupa ( Figs 8, 9 ). Color orange. Body 2.5 mm long (N=3). Cephalic region with pair of setae; antennal horns absent, upper and lower frontal horns absent, one pair of lower facial papillae with long setae, three pairs of lateral papillae (one setose and two bare); prothoracic spiracle long, setiform. Abdominal tergites 2–7 with field of strong simple spines, concentrated in discal area of tergites; terminal segment with two rounded lobes.

Larva ( Figs 10, 11 ). Color white, body elongate, cylindrical, tapered anteriorly, broadly rounded posteriorly. Integument smooth. Spatula with pair of pointy anterior lobes and long shaft posteriorly. Lateral papillae in two triplets on each side of spatula, each triplet with two setose papillae and 1 asetose papilla. Eighth abdominal segment with a mediodorsal lobe discrete on posterior margin; terminal segment with four pairs of papillae, three corniform and one with a long setae.

Examined material. 2♂, 2 pupal exuviae, 1 pupa, 1 larva from BRAZIL, São Paulo: Ribeirão Preto (21°22’10.61”S, 48°15’58.99”W), reared from leaf galls of Bauhinia holophylla , collected 21.xi.2001, emerged 25.xi.2001; Dr. Olga Kotchetkoff-Henriques coll. and det.

Gall and biology ( Fig.12 ). Leaf galls in Bauhinia holophylla (Fabaceae) : globular, hairy, pale brown to redbrownish, changing the color as the gall matures, unilocular. Pupation occurs in the gall.

New remarks to Schizomyia tuiuiu and comments on host plant. Schizomyia tuiuiu was described based on female and pupae sampled emerged from galls in Bauhinia rufa . The specimens herein described are males, exuviae and larvae emerged from galls in Bauhinia holophylla from Ribeirão Preto, SP. I compared the common structures of adult and pupa specimens and verified that the pupal characters of the two localities do not have morphological divergences, as well as the morphology of the thorax, legs and head (except for antenna, with sexual dimorphism). With the description of the larva, pupal exuvia of male and male of S. tuiuiu , it is possible to point out some differences from the congeneric species by having a discrete mediodorsal lobe on the posterior margin of the larval eighth abdominal segment, two rounded lobes on the terminal segment of the male exuvia, and apical tooth of gonostylus with a row of partially fused strong spines. The original description described the association of S. tuiuiu with Bauhinia rufa (Bong.) Steud. and the new specimens were reared from B. holophylla (Bong.) Steud. , suggesting a new host plant to S. tuiuiu . But, examining the taxonomy of the Bauhinia species ( VAZ, 2003, 2015), Bauhinia rufa var. cordata (Vogel) Benth. is a heterotypic synonym of Bauhinia holophylla with geographical distribution in Midwest and Southeast Brazil, instead of B. ruffa distributed only in Goiás and Minas Gerais ( VAZ, 2003). Therefore, from now, the host plant of Schizomyia tuiuiu is Bauhinia holophylla due to the synonymy of these species.

Figures

Fig 7. Male of Schizomyia tuiuiu Urso-Guimarães & Amorim, 2002. Terminalia ventral view, left and dorsal view, right (ae, aedeagus; ce, cercus; gc, gonocoxite; gs, gonostyle; hy, hypoproct; pa, paramere).

Figs 1-6. Male of Schizomyia tuiuiu Urso-Guimarães & Amorim, 2002: 1, head (frontal view); 2, third flagelomere; 3, palpus; 4, wing; 5, first tarsomere; 6, tarsal claw and empodium

Figs 8-11. Schizomyia tuiuiu Urso-Guimarães & Amorim, 2002. Figs 8, 9, pupa: 8, cephalic region (ventral view); 9, posterior region (dorsal view); Figs.10, 11, larva: 10, prothoracic spatula and lateral papillae (ventral view); 11, terminal segment (dorsal view).

Fig. 12. Galls of Schizomyia tuiuiu Urso-Guimarães & Amorim, 2002 induced in leaves of Bauhinia holophylla (Bong.) Steud. (Fabaceae).