Bruggmannia gaucha, Maia & Mendonça, 2023

Maia, Valéria Cid, Jr, Milton de Souza Mendonça & Espinheira, Ivana Hortélio Leão, 2023, Three new species of Bruggmannia Tavares, 1906 (Diptera: Cecidomyiidae) from Brazil and description of male and larva of B. monteiroi Maia & Couri, 1993, Revista Brasileira de Entomologia (e 20220097) 67 (1), pp. 1-19 : 3-6

Bruggmannia gaucha, Maia & Mendonça , sp. n.

urn:lsid:zoobank.org:act:A7C706DC-FA54-4D35-AFAD-31E026904EFC Description. Male.2.0- 2.3 mm long (n=3). Head: eye facets circular, closely appressed; antennae: scape trapezoidal, setose, pedicel globoid, setose, flagellomeres cylindrical, node microtrichose and neck almost entirely microtrichose, flagellomere node 3.6 times the length of neck (n=3); 1 st and 2 nd flagellomeres connate; circumfila wavy ( Fig. 5a ); last three flagellomeres similar in length ( Fig. 5b ); frons barely visible in the slides; mouth parts: labrum long-attenuate; hypopharynx of the same shape of labrum, with long anteriorly directed lateral setulae; labella elongate-convex, with lateral and two mesal setae each; palpus: 1 st segment globoid, 2 nd and 3th segments claviform, 2 nd segment 1.5 times as long as 1 st segment, 3 nd segment 1.5 times as long as 2 nd segment, all segments with setae and scales. Thorax: scutum with two dorsocentral rows of setae with scales intermixed, setae more abundant anteriorly and two rows of lateral setae, with scales intermixed; scutellum with scattered setae; anepimeron with a longitudinal row of setae and some scales; other pleura bare; wing ( Fig. 5c ) length (from arculus to apex): 2.10–2.20 mm (n=3); tarsal claws bent beyond midlength, empodium reaching bent in claws ( Fig. 5d ). Abdomen ( Fig. 5e ): 1 st –7 h tergites sclerotized, rectangular with posterior row of setae, few lateral setae, scales scattered, no basal pair of trichoid sensilla; 8 th tergite not visible; 2 nd –8 th sternites rectangular with posterior row of setae, numerous setae at midlength, lateral setae present, scales scattered, and a basal pair of trichoid sensilla. Terminalia ( Fig. 5f ): gonocoxite hemispherical, setose, setae more abundant at the apex, microtrichose, 2.0-2.2 times the length of gonostylus; gonostylus squarish with a row of setae just below teeth, scattered setae, microtrichose; cerci separate, riniform, setose, microtrichose; hypoproct bilobed, setose, microtrichose; aedeagus glossiform, gonocoxal lobes very short.

Female. 3.2-3.5 mm long (n=3). Head as in male ( Fig. 6a ), circumfila less sinuous than in male, with two connected rings ( Fig. 6b ); frons with 30 setae (n=2); labella elongate-convex, 2.0-3.0 times as long as wide (n=3); palpus: 2 nd segment 2.0 times as long as 1 st segment, 2 nd and 3 rd segments subequal in length; wing length (from arculus to apex): 2.35–2.50 mm (n=3). Abdomen ( Figs.6 c-7a): 1 st –7 th tergites as in male; 8 th tergite sclerotized, laterally notched, with distal row of setae, scales scattered, no basal pair of trichoid sensilla; 2 nd –6 th sternites as in male; 7 th sternite 1.72-1.86 times as long as 6 th sternite, with posterior row of setae, numerous setae at midlength, lateral setae present, scales scattered, and a basal pair of trichoid sensilla; 8 th sternite not sclerotized; ovipositor ( Fig. 7b) soft, short, 1.72 times the length of 7 th sternite (n=1); cerci tiny with some short setae.

Pupa ( Fig. 8a ). 2.1-3.1 mm long (n=2). Integument brownish. Head ( Fig. 8b ): pair of antennal papillae present, antennal horn conical, short, with outer and inner margins smooth; apical seta 0.7 times the length of prothoracic spiracle; upper facial horns semicircular; lower facial horns conical; two pairs of lower facial papillae: one pair with seta, the other bare; two lateral facial papillae near base of each palpus, one with setae, the other bare; upper cephalic margin thickened laterally, face with lateral projection, head integument wrinkled just below antennal bases and around upper facial horns, except below them. Thorax: prothoracic spiracle setiform, curved, short, 0.08-0.09 mm long, 1.2-1.3 times as long as flagellomeres width, prothorax with three pairs of dorsal papillae and two pairs of lateral papillae, no lateral projection just below prothoracic spiracles. Abdomen: spiracles not elongated, 2 nd –8 th segments with dorsal spines near anterior margin, arranged only centrally, spines in the 2 nd segment rudimentary, shorter than those of 3 rd- 8 th segments ( Fig. 8c ), integument ventrally sculptured. Last segment with two rounded terminal projections in both sexes, projections close together and longer in male pupa, projections far apart and shorter in female pupa ( Figs. 8d, e ).

Larva ( Fig. 9a ). 3.20 mm long (n=3), body elongate, cylindrical, tapered towards posterior end; integument rough. Prothoracic sternal spatula absent, sternal papillae setose; three setose lateral papillae on each side, four dorsal papillae setose from 1 st to 7 th abdominal segments. Terminal segment with 1/5 of total length of larva, integument rough dorsally, elongate and strongly tapered towards apex, a group of setulae subasally ( Fig. 9b ). Papillae not visible. Anus rounded.

Gall ( Fig. 9c ): on stem, fusiform to ovoid, reddish, glabrous, one to multichambered on Guapira opposita.

Etymology. The name “gaucha ” means native of the state of Rio Grande do Sul.

Material Examined. Holotype male. Brazil, Rio Grande do Sul, Porto Alegre (Morro Santana), 22.X.2013, Rodrigues A. col, MNRJ . Paratypes: same locality, date and collector as holotype, 2 males, 3 females, 2 pupal exuviae, 2 pupae, 4 larvae, MNRJ .

Distribution: Rio Grande do Sul (Porto Alegre, Viamão, Canela, Maquiné e Torres).

Comments. This species is unique in having the following set of characters: 1) Adults: glossiform aedeagus, ovipositor 1.72 times the length of 7 th sternite; 2) Pupa: no lateral projection below prothoracic spiracles; setiform, curved and short prothoracic spiracles; short and not sparse abdominal spines; and 3) Larva: terminal segment with 1/5 of total length of body. The comparison between Bruggmannia gaucha and other congeneric species on Guapira was showed in the comments of B. capixaba .

Figures

Figure 5 Bruggmannia gaucha, sp. n., male: a) 3rd flagellomere, b) 10th – 12th flagellomeres, c) Wing, d) Tarsal claw, foreleg, lateral view, e) Abdominal segments, f) Terminalia, dorsal view.

Figure 6 Bruggmannia gaucha, sp. n., female: a) Head, ventral view, b) 5th flagellomere, c) 6th – 8th abdominal segments, dorsal view.

Figure 8 Bruggmannia gaucha, sp. n., pupa: a) General aspect, dorsal view, b) Head, ventral view, c) 7th abdominal segment to end, dorsal view, d-e) Terminal segment, sexual dimorfism, ventral view: d) Male pupa, e) Female pupa.

Figure 9 Bruggmannia gaucha, sp. n. a) Larva, general aspect, dorsal view, b) Larva, terminal segment, lateral view, c) Gall, general aspect.