Microvelia hamadae, dos Santos & Rodrigues & Couceiro & Moreira, 2021

dos Santos, Suzane E., Rodrigues, Juliana M. S., Couceiro, Sheyla R. M. & Moreira, Felipe F. F., 2021, Gerromorpha (Hemiptera: Heteroptera) from the Metropolitan Region of Santarem, Brazil, including three new species of Microvelia Westwood, 1834 (Veliidae: Microveliinae), Biodiversity Data Journal 9, pp. 68567-68567 : 68567

Microvelia hamadae sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: S.E. Santos; sex: apterous?; Location: country: Brazil; stateProvince: Pará; municipality: Belterra; locality: BR-163, Km-115 ; verbatimLatitude: 03°17'34.8"S; verbatimLongitude: 54°52'45.6"W; Event: verbatimEventDate: 25.IX.2020; habitat: igarapé; Record Level: type: PhysicalObject; institutionCode: CEIOC 81767; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: recordedBy: S.E. Santos; sex: 1 apterous?, 1 macropterous?, 2 apterous?; Location: country: Brazil; stateProvince: Pará; municipality: Belterra; locality: BR-163, Km-115 ; verbatimLatitude: 03°17'34.8"S; verbatimLongitude: 54°52'45.6"W; Event: verbatimEventDate: 25.IX.2020; habitat: igarapé; Record Level: type: PhysicalObject; institutionCode: CEIOC 81768; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: recordedBy: S.E. Santos; sex: 1 macropterous?; Location: country: Brazil; stateProvince: Pará; municipality: Belterra; locality: BR-163, Km-115 ; verbatimLatitude: 03°17'34.8"S; verbatimLongitude: 54°52'45.6"W; Event: verbatimEventDate: 20.I.2020; habitat: igarapé; Record Level: type: PhysicalObject; institutionCode: CEIOC 81769; basisOfRecord: PreservedSpecimen

Description

Apterous males

Holotype/Paratype. BL 1.23/1.24, HL 0.22/0.22, HW 0.38/0.38, ANT I 0.16/0.16, ANT II 0.10/0.10, ANT III 0.12/0.12, ANT IV 0.24/0.24, INT 0.18/0.18, EYE 0.09/0.09, PL 0.20/0.20, PW 0.46/0.48; FORE LEG: FEM 0.32/0.32, TIB 0.24/0.24, TAR I 0.16/0.16; MID-LEG: FEM 0.40/0.38, TIB 0.28/0.28, TAR I 0.06/0.06, TAR II 0.12/0.12; HIND LEG: FEM 0.40/0.42, TIB 0.40/0.42, TAR I 0.06/0.06, TAR II 0.13/-.

Head black. Antenna dark-brown, proximal half of antennomere I yellowish-brown. Eye reddish-brown. Labium yellowish-brown, except for distal article dark-brown. Pronotum dark-brown with a medially interrupted yellowish-brown transverse band on anterior half (Fig. 14 A). Metanotum black. Prosternum yellowish-brown, median groove dark. Meso- and metasterna black. Acetabula brown. Coxae, trochanters and proximal half and ventre of femora pale yellow; remainder of legs brown. Abdominal mediotergites black with whitish pruinosity; I with two darker longitudinal spots sublaterally; II-III darker at middle; IV-V dark with whitish pruinosity at median stripe and posterior third; VI-VII darker at one/two narrow median stripe(s). Abdominal laterotergites yellowish-brown, darker at anterior third and mesal and lateral margins. Abdominal sterna black (Fig. 14 B). Terminalia yellowish-brown.

Head covered with short setae, longer on clypeus. Antenna reaching apex of metanotum; covered with short setae, longer and denser on article IV. Antennomere I widest, slightly curved laterally, thickened towards apex; II wider than III-IV, thickened towards apex; III cylindrical, thinner than IV; IV fusiform. Labium reaching middle of mesosternum.

Thoracic terga densely covered with very short setae; sides of thorax, prosternum and acetabula with longer setae. Pronotum long, covering mesonotum and most of metanotum; metanotum visible only as a very short central stripe (Fig. 14 C). Circular punctures on a centrally interrupted transverse row adjacent to anterior margin of pronotum; another transverse row posterior to yellowish band; several sparse punctures posteriorly to latter row. Legs covered with short setae, with some longer setae on dorsal surfaces of femora and tibiae. Femora without spines. Fore tibia straight, enlarged towards apex, with an obtuse, short spine at apex. Hind femur thicker than middle femur. Hind tibia straight.

Abdomen covered with short setae. Posterior margin of abdominal mediotergite I with a slight concavity at middle; VII with a pronounced concavity (Fig. 14 D). Abdominal laterotergites elevated to about 45 º. Abdominal sterna II-IV moderately short, V-VI longer, VII twice as long as II; posterior margins concave, without tubercles, with many long setae (Fig. 14 E). Abdominal segment VIII deeply inserted into pregenital abdomen; partially visible dorsally due to the concavity of mediotergite VII; faintly visible ventrally (Fig. 14 D, E); posterior margin dorsally concave, ventrally with a weak median notch (Fig. 15 A-D). Proctiger without lateral projections (Fig. 15 E); parameres symmetrical (Fig. 15 G); shape as in Fig. 15 F.

Macropterous males

BL 1.42-1.44, HL 0.22-0.23, HW 0.40, ANT I 0.16, ANT II 0.10, ANT III 0.12, ANT IV 0.24-0.26, INT 0.18, EYE 0.08-0.10, PL 0.46-0.48, PW 0.66; FORE LEG: FEM 0.32, TIB 0.24, TAR I 0.16; MID-LEG: FEM 0.38, TIB 0.30, TAR I 0.04-0.06, TAR II 0.12; HIND LEG: FEM 0.42-0.44, TIB 0.44-0.46, TAR I 0.06, TAR II 0.12.

Colouration and structure similar to apterous male (Fig. 16 A-C). Pronotum long, subpentagonal, completely covering meso- and metanota; posterior margin rounded. Fore wings dark brown, with a proximal pair of elongated whitish maculae, a distal pair of rounded whitish maculae and a median whitish macula close to apex; lateral margins with rows of white setae.

Apterous females

BL 1.36-1.42, HL 0.22-0.24, HW 0.40, ANT I 0.16, ANT II 0.10, ANT III 0.12, ANT IV 0.26, INT 0.18-0.20, EYE 0.09, PL 0.20, PW 0.52-0.54; FORE LEG: FEM 0.34, TIB 0.26, TAR I 0.18; MID-LEG: FEM 0.40, TIB 0.30-0.31, TAR I 0.06, TAR II 0.12; HIND LEG: FEM 0.44, TIB 0.46, TAR I 0.06, TAR II 0.14.

Colouration and structure similar to apterous male, but larger and more robust (Fig. 16 D-F). Fore tibia straight, enlarged towards apex, without apical spine. Posterior margins of abdominal mediotergite VII and sternum VII straight. Posterior margin of abdominal tergum VIII rounded, with long setae. Abdominal laterotergites elevated to about 90 º, slightly bowed on sides of mediotergites II-V, convergent and slightly reflected on sides of VI-VIII (Fig. 16 D). Possibly fecundated females display expanded abdomen with differently shaped laterotergites (Fig. 16 F).

Diagnosis

This new species can be distinguished from other South American Microvelia by the pronotum of apterous specimens long, covering the mesonotum and most of the metanotum; the metanotum visible only as a very short central stripe; the posterior margin of the male abdominal mediotergite VII with a pronounced concavity; the male abdominal segment VIII deeply inserted into the pregenital abdomen, with the posterior margin dorsally concave and ventrally with a weak median notch; the shape of the female abdomen, with abdominal laterotergites elevated to about 90 º, slightly bowed on the sides of mediotergites II-V, convergent and slightly reflected on the sides of VI-VIII; and by the pattern of whitish maculae on the fore wings of macropterous specimens: a proximal pair of elongated maculae, a distal pair of rounded maculae and a median macula close to apex. Additionally, M. hamadae sp. nov. has the body shorter than 1.50 mm (apterous males 1.23-1.24 mm; macropterous males 1.42-1.44 mm; apterous females 1.36-1.42 mm).

Microvelia hamadae sp. nov. is very different from other Neotropical species of Microvelia with known apterous forms in which the pronotum covers the mesonotum and the metanotum completely or almost completely (e.g. M. argentata Nieser & Alkins-Koo, 1991, M. digitalis Padilla-Gil, 2019, M. hambletoni Drake, 1951, M. hormiga Padilla-Gil, 2019, M. ioana Drake & Hottes, 1952, M. limaiana Drake, 1951, M. micra Padilla-Gil, 2019, M. nelsoni Moreira, Barbosa & Ribeiro, 2012, M. potama Drake, 1958, M. recifana Drake, 1951 and M. reflexa Polhemus, 1974), because the general shape is distinct and they all have the male terminalia well-exposed, differently from the new species. The females of M. ioana , M. micra and M. reflexa share with M. hamadae sp. nov. the abdominal laterotergites reflected over the mediotergites, but the general colour of the body and the shape of the pronotum are quite different from the new species.

The macropterous form of the new species can be distinguished from the small South American species with known macropterous forms (e.g. M. hinei , M. lujanana Drake, 1951, M. munda Drake, 1951, M. pudoris Drake & Harris, 1936, M. summersi Drake & Harris, 1928 and M. venustatis ) because of the pattern of maculae on the fore wings, together with the strongly inserted male terminalia and the shape of the male pygophore, proctiger and parameres.

Etymology

This species is named in honour of Dr. Neusa Hamada (Instituto Nacional de Pesquisas da Amazônia, Manaus), one of the most important Brazilian aquatic entomologists.

Figures

Figure 14. Microvelia hamadae sp. nov., apterous male, holotype A. Habitus, dorsal view; B. Habitus, ventral view; C. Head and thorax, dorsal view; D, E Abdomen, segments IV-VII and terminalia: D. Dorsal view E. Ventral view. Scale bars: (A and B) 1 mm, (C-E) 0.2 mm.

Figure 15. Microvelia hamadae sp. nov., male terminalia A. Dorsal view; B. Ventral view; C, D Abdominal segment VIII: C. Dorsal view; D. Ventral view; E-G Genital capsule: E. Dorsal view; F. Lateral view; G. Ventral view. Scale bars: (A and B) 0.2 mm, (C-G) 0.1 mm.

Figure 16. Microvelia hamadae sp. nov., paratypes A-C Macropterous male: A. Habitus, dorsal view; B. Habitus, ventral view; C. Abdominal segments V-VII and terminalia, ventral view; D-F Apterous females: D. Habitus, dorsal view; E. Habitus, ventral view; F Habitus, dorsal view; abdomen with different shape, probably with eggs. Scale bars: (A, B and D-F) 1 mm, (C) 0.2 mm.