Hydrometra tuberculata Cordeiro, Rodrigues & Moreira, 2023

Rodrigues, Juliana Mourão Dos Santos, Cordeiro, Isabelle Da Rocha Silva, Floriano, Carla Fernanda Burguez, Paiva, Nathália De Oliveira, Magalhães, Oséias Martins, Júnior, Evaldo Alves Joaquim, Martins, Thaynara De Souza, Silva, Rafaella Cardoso Da, Siqueira, Gabriel Vieira, Salles, Frederico Falcão, Viala, Séverine, Khila, Abderrahman & Moreira, Felipe Ferraz Figueiredo, 2023, Descriptions of new species and new records of water bugs (Hemiptera: Heteroptera: Gerromorpha & Nepomorpha) from southeastern Brazil, Zootaxa 5393 (1), pp. 1-86 : 43-45

Hydrometra tuberculata Cordeiro, Rodrigues & Moreira , sp. nov.

Figs. 5G , 30–33

Material examined. Holotype. BRAZIL — Espírito Santo • Sooretama, Reserva Biológica de Sooretama, puddle on the mud; alt. 30 m; –18.9704, –40.1168; 26.VI.2022; JC Santos, JMS Rodrigues, NO Paiva, L Nery, CL Rodrigues leg.; 1 micropterous male, CEIOC 82253 . Paratypes. BRAZIL — Espírito Santo • Conceição da Barra, Reserva Biológica do Córrego Grande , weir and stream; alt. 44 m; –18.2692, –39.7814; 25. IV.2023; JMS Rodrigues , NO Paiva, FFF Moreira, IS Medeiros, CL Rodrigues leg.; 1 micropterous male, CEIOC 82854 • Conceição da Barra , floodplain; alt. 21 m; –18.6341, –39.8141; 23. IV.2023; JMS Rodrigues , NO Paiva, FFF Moreira, IS Medeiros, CL Rodrigues leg.; 1 micropterous female, CEIOC 82856 • São Mateus, São Lázaro Ranch , dam, #8; –18.7235, –39.9120; 20.XI.2007; FF Salles leg.; 1 micropterous female, CEIOC 82815 .

Description. Micropterous male. Holotype (Paratype). BL 14.20 [without segment VIII] (14.60); HL 5.10 (4.80); ANTL 3.30 (3.40); POSTL 1.30 (1.20); ANTWmax 0.58 (0.55); ANTWmin 0.26 (0.25); POSTWmax 0.50 (0.50); POSTWmin 0.34 (0.32); CLL 0.24 (0.20); CLWmax 0.18 (0.18); MPL 0.30 (0.30); HW 0.68 (0.70); IOW 0.16 (0.16); OL 0.40 (0.40); EYE 0.28 (0.28); ANT: I 0.78 (0.75), II 1.60 (1.65), III 5.90 (6.00), IV 2.60 (2.80); LBL: I–II covered, III 2.50 (2.80), IV 0.34 (0.40); PL 2.30 (2.30); PW 0.70 (0.70); WiL 2.20 (2.40); WiW 0.25 (0.20); DIST1 1.60 (1.60); DIST2 2.30 (2.30); FORELEG, FEM 5.00 (5.10); TIB 5.90 (5.80); TAR: I 0.10 (0.08), TAR II 0.50 (0.50), TAR III 0.30 (0.30); MIDLEG, FEM 6.00 (6.20); TIB 6.40 (6.40); TAR: I 0.10 (0.10), TAR II 0.55 (0.52), TAR III 0.35 (0.36); HINDLEG, FEM 7.50 (7.20); TIB 8.30 (7.60); TAR: I 0.15 (0.12), TAR II 0.55 (0.40), TAR III 0.35 (0.28); ABL 4.80 [without segment VIII] (5.50); ABWmax 0.65 (0.70); ABWmin 0.45 (0.50); TERL: I covered, II partially covered, III 0.85 (0.90), IV 0.90 (0.90), V 0.80 (0.90), VI 0.75 (0.80), VII 0.60 (0.70); TERW: I covered, II partially covered, III 0.30 (0.40), IV 0.35 (0.40), V 0.35 (0.30), VI 0.30 (0.30), VII 0.50 (0.40); SVIII 0.73 (0.70); PP 0.04 (0.03).

General color dark-brown; orange transverse stripe at base of head ( Fig. 30A, C ), whitish longitudinal stripe laterally on thorax and abdomen ( Fig. 30A, D, F, G ). Maxillary plate shiny. Clypeus, antennomeres I–IV and buccula shiny, dark-brown. Eye reddish-brown. Antenniferous tubercle, labium and legs brown. Coxae yellowish, venter of trochanters whitish-yellow. Thoracic and abdominal sterna yellowish on midline.

Head elongated, with apex of anteocular region swollen; anteocular region 2.5 times longer than postocular region; region around eyes slightly swollen, giving impression of a small groove on interocular space; posterior pair of trichobothria reaching anterior margin of pronotum. Clypeus broad; lateral margins weakly constricted near base; anterior margin rounded, slightly produced mesally ( Fig. 30B ). Anterior margin of maxillary plate rounded. Buccula rounded, covering base of labium. Eye well-developed, set on posterior 1/3 of head ( Fig. 30A, D, E ). Antenniferous tubercle with a slight V-shaped emargination on anterior margin. Antennomere I shortest, densely covered by short setae; antennomere III longest. Labium reaching postocular region of head. Venter of head swollen around eyes, with filiform setae.

Prothorax with row of punctations adjacent to anterior margin; anterior lobe of pronotum without other punctations; posterior lobe of pronotum with median row of punctations and many other punctations on each side more or less arranged in rows ( Fig. 30C ); row of punctations adjacent to posterior margin of propleuron. Proacetabulum with 18 circular punctations; 14 on mesoacetabulum; 11 on metacetabulum; pro- and mesoacetabula each also with one large pit anteriorly and another one posteriorly ( Fig. 30F ). Forewing reduced, reaching abdominal mediotergite II. Legs long, slender. Venter of thorax without carinae, tubercles or grooves.

Abdomen weakly, obliquely, oriented dorsally on segments V–VII, becoming parallel to body on segment VIII ( Fig. 30D ). Abdominal mediotergites II–VI longer than broad, with glabrous shiny aspect; mediotergite VII trapezoidal, opaque, with setae, except for glabrous shiny circular area anteriorly. Abdominal laterotergites slightly elevated. Abdominal sternum VI without distinct modifications; sternum VII with a pair of circular areas bordered by black setae, these curved towards center of each circle ( Fig. 30G, H ). Abdominal segment VIII cylindrical, without lateral tumescence, slightly constricted ventrolaterally; posterodorsal process short, straight, with approximately 5% of total length of segment ( Figs. 30G, H , 31A–C ). Pygophore with rounded apex; on lateral margin, a tubercle with punctations and dark stout setae ( Fig. 31D ). Proctiger with slightly convex apex; a tumescent area with a tuft of strong setae projecting laterally ( Fig. 31D–F ).

Micropterous female. Paratypes. BL 16.95–17.70; HL 5.10–5.40; ANTL 3.30 – 3.45 ; POSTL 1.30 ;ANTWmax 0.60; ANTWmin 0.30; POSTWmax 0.50; POSTWmin 0.40; CLL 0.22; CLWmax 0.18–0.25; MPL 0.32–0.38; HW 0.65–0.68; IOW 0.15–0.20; OL 0.35–0.40; EYE 0.20–0.24; ANT: I 0,70–0.80, II 1.50 – 1.70 , III 4.50 –5.00, IV 1.70 –2.00; LBL: I– II covered, III 2.80 –3.00, IV 0.30–0.34; PL 2.60 – 2.70 ; PW 0.70–0.80; WiL 2.50–2.70; WiW 0.20–0.30; DIST1 1.85–1.90; DIST2 2.80–3.00; FORELEG, FEM 4.90–5.50; TIB 4.90–5.00; TAR: I 0.08–0.10; TAR: II 0.46–0.56; TAR: III 0.30–0.32; MIDLEG, FEM 5.80–5.90; TIB 5.20–5.50; TAR: I 0.10–0.12, TAR II 0.68– 0.70, TAR III 0.34–0.38; HINDLEG, FEM 7.20–7.30; TIB 6.70–6.80; TAR: I 0.12–0.14, TAR II 0.60–0.64, TAR III 0.34–0.36; ABL 7.00–7.20; ABWmax 0.90–1.00; ABWmin 0.60; TERL: I covered, II 1.20 –1.00, III 1.20 – 1.30 , IV 1.20 – 1.30 , V 1.20 , VI 1.00, VII 0.70; TERW: I covered, II 0.30, III 0.30–0.35, IV 0.30–0.40, V 0.30–0.35, VI 0.30, VII 0.40; SVIII 0.48–0.54; PP 0.10–0.12.

General color brown; weakly orange transverse stripe at base of head; whitish longitudinal stripe laterally on thorax and abdomen. Venter of head black. Maxillary plate shiny dark-brown. Clypeus, distal half of antennomere I, apex of II, entire III and IV brown. Buccula, labium, antenniferous tubercle, proximal half of antennomere I and almost entire II orange-brown. Eye shiny brown. Posterior lobe of pronotum, wings and abdominal laterotergites II–VI orange brown. Legs brown; coxae orange-brown; venter of trochanters and femora yellow; apex of femora and tibiae dark-brown; tarsi dark-brown. Thoracic sterna brown. Abdominal sterna orange; II–VI with a narrow, brown, median stripe.

Similar to male in structure, except for the following: anteocular region of head 2.65 times longer than postocular region; proacetabulum with 21 circular punctations, 21 on mesoacetabulum, 16 on metacetabulum ( Fig. 32D ); abdominal sternum VII with a pair of shiny elliptical areas near anterior margin; posterior process of abdominal segment VIII slightly curved posteriorly, with approximately 20% of total length of segment.

Etymology. The specific epithet tuberculata (Latin, feminine) refers to the tubercle present on the lateral margin of the male pygophore of this new species.

Comments. Hydrometra tuberculata Cordeiro, Rodrigues & Moreira , sp. nov. can be distinguished from other South American species of the genus by the following set of features: clypeus broad, with the lateral margins weakly constricted near the base and the anterior margin rounded, slightly produced mesally ( Fig. 30B ); acetabula and dorsum of thorax densely punctated ( Figs. 30C, F , 32D ); male abdominal sternum VI without distinct modifications ( Fig. 30G–H ); sternum VII with a pair of circular areas bordered by black setae, these curved towards the center of each circle ( Fig. 30G, H ); male abdominal segment VIII cylindrical, slightly constricted ventrolaterally, with the posterior process short, straight, with approximately 5% of the total length of the segment ( Figs. 30G, H , 31A–C ); male pygophore laterally with a tubercle with punctations and dark stout setae ( Fig. 31D ); and male proctiger with a tumescent area bearing a tuft of strong setae projecting laterally ( Fig. 31E, F ).

This new species is more similar to H. guianana and H. caraiba Guérin-Méneville, 1857 , with which it shares the whitish longitudinal stripe along the sides of the thorax and abdomen, the punctations on all acetabula, and the male abdominal mediotergite VII with a circular, glabrous, shiny area anteriorly. Differently from the new species, however, H. guianana has the clypeus curved upwards near the apex and with an angulose median projection at the anterior margin ( Nieser 1970: fig 187), displays different modifications of the male abdomen (compare Fig. 30G, H and Hungerford & Evans 1934: plate X), and lacks the distinct lateral tumescence on the male segment VIII. Although the clypeus of H. caraiba ( Nieser 1970: fig. 181) is more similar to that of the new species, it too has differently modified male abdomen (compare Fig. 30G, H and Nieser 1970: Figs. 178, 179) and lacks the distinctive features of the male proctiger described here.

Figures

FIGURE 5. Collecting localities in Espírito Santo state, Brazil. A, B. Reserva Biológica (REBIO) Augusto Ruschi, Piraquê- Açu River; −19.8805, −40.5405. C. REBIO Augusto Ruschi, stream near the headquarter; −19.9111, −40.5544. D, E. REBIO Augusto Ruschi, −19.8967, −40.5236. D. Weir. E. Stream. F. Monumento Natural dos Pontões Capixabas, Sítio Santa Maria, weir; −19.1765, −40.7844. G. Reserva Biológica de Sooretama, puddle on the mud; −18.9704, −40.1168. H. Colatina, Pancas River; −19.2986, −40.7176. I. Floresta Nacional de Goytacazes, tributary paleo-riverbed of Doce River; −19.4376, −40.0768.

FIGURE 30. Hydrometra tuberculata Cordeiro, Rodrigues & Moreira, sp. nov., micropterous male, holotype. A. Habitus, dorsal view. B. Apex of head and antennomere I, dorsal view. C. Pronotum, dorsal view. D. Habitus, lateral view. E. Habitus, ventral view. F. Thorax and part of the legs, lateral view. G, H. Apex of abdomen, lateral and ventral views, respectively. Scale bars: 2.0 mm (A, D, E, F), 0.5 mm (C, G, H), 0.2 mm (B).

FIGURE 31. Hydrometra tuberculata Cordeiro, Rodrigues & Moreira, sp. nov., holotype, male terminalia. A−C. Abdominal segment VIII, dorsal, ventral and lateral views, respectively. D. Genital capsule, lateral view. E, F. Proctiger, dorsal and lateral views, respectively. Scale bars: 0.5 mm (A−C), 0.2 mm (D), 0.1 mm (E, F).

FIGURE 32. Hydrometra tuberculata Cordeiro, Rodrigues & Moreira, sp. nov., micropterous female, paratype. A. Habitus, dorsal view. B. Habitus, ventral view. C. Apex of head and antennomere I, dorsal view. D. Thorax and part of the legs, lateral view. E. Habitus, lateral view. Scale bars: 2.0 mm (A−C, E, F), 0.5 mm (D).

FIGURE 33. Distribution of Hydrometra tuberculata Cordeiro, Rodrigues & Moreira, sp. nov.