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A New Species and New Synonymy in Limnocoris (Hemiptera: Heteroptera: Naucoridae) from Brazil

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A New Species and New Synonymy in Limnocoris (Hemiptera: Heteroptera: Naucoridae) from Brazil ISSN 1211-8788 Acta Musei Moraviae, Scientiae biologicae (Brno) 98(2): 335–346, 2013 A new species and new synonymy in Limnocoris (Hemiptera: Heteroptera: Naucoridae) from Brazil NICO NIESER1, PING-PING CHEN1 & ALAN LANE DE MELO2 1 Department of Terrestrial Zoology, Naturalis Biodiversity Centre, Postbus 9517, 2300 RA Leiden, The Netherlands; e-mail: [email protected], [email protected] 2 Departamento de Parasitologia, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Av. Antonio Carlos 6627, 31270/901 Belo Horizonte, Minas Gerais, Brasil; e-mail: [email protected] NIESER N., CHEN P.-P. & DE MELO A. L. 2013: A new species and new synonymy in Limnocoris (Hemiptera: Heteroptera: Naucoridae) from Brazil. In: KMENT P., MALENOVSKÝ I. & KOLIBÁÈ J. (eds.): Studies in Hemiptera in honour of Pavel Lauterer and Jaroslav L. Stehlík. Acta Musei Moraviae, Scientiae biologicae (Brno) 98(2): 335–346. – Limnocoris lautereri sp.nov. is described from Minas Gerais, Brazil. A lectotype is designated for Limnocoris volxemi (Lethierry, 1877), and L. maculiceps Montandon, 1897, syn.nov., is established as a junior subjective synonym of L. volxemi. Keywords. Heteroptera, Naucoridae, Limnocoris, aquatic bugs, lectotype designation, new synonymy, new species, taxonomy, Neotropical Region, Brazil Introduction The genus Limnocoris Stål, 1860 is currently placed in the monotypical subfamily Limnocorinae Stål, 1876, under the family Naucoridae Leach, 1815. The genus comprises 71 known species, including the new one described here, of which 30 occur in Brazil, 13 in Minas Gerais, and 6 in Amazonas (NIESER & LOPEZ RUF 2001, MOREIRA et al. 2011, this work). Limnocoris is essentially a Neotropical genus, although one somewhat aberrant species (L. moapensis La Rivers, 1950) lives in certain warm springs in Nevada, U.S.A., and another species’ distribution reaches Texas (HENRY & FROESCHNER 1988). The greatest diversity of species is found in the Andes mountain range (NIESER et al. 1993) and in the area from south-eastern Brazil to northern Argentina (NIESER & LOPEZ RUF 2001). In Minas Gerais, most limnocorids live in small to medium-sized streams with slow to moderate current and a bottom of fine to coarse sand or small pebbles. The bugs appear to be nocturnal, hiding in the sandy substratum by daytimeh; however, nothing definite is known of their way of life. The most commonly found species in the state, L. volxemi Lethierry, 1877, has usually been caught among vegetation at the virtually still edges of streams, and occasionally in still-water pools in marshes as well. The first revision of the genus was undertaken by MONTANDON (1898), who recognized 17 species. DE CARLO (1951) published photographs of the 13 species present in the collection of the Museo Argentina de Ciencias Naturales, mostly from Argentina and southern Brazil. Subsequently, J. A. de Carlo and I. La Rivers described a number of 335 N. NIESER ET AL. new species, which were summarized in papers by LA RIVERS (1971, 1974, 1976). NIESER et al. (1993) described five new species from Departamento Valle del Cauca, Colombia, and later NIESER & LOPEZ RUF (2001) revised the genus for the southern area of South America, adding 10 new species, pointing out some synonymies, and presenting a complete checklist of species. In the course of work on Heteroptera samples collected from Amazonas in Brazil, a previously unknown species of Limnocoris was disclosed, which is described herein. In addition, the correct taxonomic status of L. volxemi is studied and confirmed. We dedicate this work to the outstanding hemipterists RNDr. Pavel Lauterer and RNDr. Jaroslav L. Stehlík; also to express gratitude for the invaluable help to Ping-Ping Chen in her study on Homoptera. Material and methods The material examined is deposited in the following collections: DPIC . Departamento de Parasitologia, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brasil ISNB . Département d’Entomologie, Institut Royal des Sciences Naturelles de Belgique, Bruxelles, Belgium MNHN . Muséum national d’Histoire naturelle, Paris, France NCTN . N. Nieser & P.-P. Chen collection, Tiel, The Netherlands In our approach to the study and to terminology, we follow NIESER & LOPEZ RUF (2001). The term “synthlipsis” is the smallest distance between the eyes at the rear. The detailed positions at which measurements were taken appears in Figs 24–25; all measurements are given in mm and presented as the mean for certain more important measurements, followed by the range in parentheses. Means are based on five specimens for each sex. The sternal carinae are described with the ventral side upward. The black-and-white line illustrations were made with the aid of a camera lucida on a Leitz stereo microscope, and an Olympus monocular microscope. Habitus photos were taken with a Nikon D700 body with AF 60 mm f2.8D Micro-Nikkor lens, and a Leica 500, and worked up with Adobe Photoshop CS2, version 9.0. Results Limnocoris lautereri sp.nov. (Figs 3, 4, 5, 10, 13, 16, 17) Type material. Holotype: ♂ (brachypterous), Brasil: Amazonas: Pitinga, 00°47′28.7″S, 60°04′12.2″W, Estaude de Tiros, abaixo da corredeira, 2.iv.2000, leg. D. L. V. Pereira (DPIC). PARATYPES: 14 ♂♂ 14 ♀♀ (all brachypterous), same data as holotype (7 ♂♂ 7 ♀♀ DPIC, 7 ♂♂ 7 ♀♀ NCTN). Description (based on specimens stored in 70% ethanol). Generally a small, light brown, broadly oval species (Fig. 3). Dimensions. Body length: ♂♂ 6.6 (6.5–6.8) {HT 6.6}, ♀♀ 6.6 (6.5–6.8), width across embolia: ♂♂ 4.6 (4.5–4.8) {HT 4.8}, ♀♀ 4.7 (4.6–4.8), width across connexiva: ♂♂ 4.2 (4.1–4.4) {HT 4.4}, ♀♀ 4.3 (4.2–4.4), anterior width of vertex: ♂♂ 1.32 336 Acta Musei Moraviae, Sci. biol. (Brno), 98(2), 2013 New species and synonymy in Limnocoris Figs 1–3. 1–2 – Limnocoris volxemi (Lethierry, 1877): 1 – lectotype, male; body length 9.0 mm; 2 – paralectotype, female; body length 9.5 mm. 3 – Limnocoris lautereri sp.nov., paratype, male; body length 6.2 mm. (1.30–1.36) {HT 1.34}, ♀♀ 1.35 (1.30–1.40), width of pronotum ♂♂ 4.04 (3.90–4.16) {HT 4.16}, ♀♀ 4.06 (3.98–4.17), median length of pronotum: ♂♂ 1.31 (1.24–1.35) {HT 1.35}, ♀♀ 1.36 (1.30–1.40), lateral length of pronotum: ♂♂ 1.65 (1.56–1.72) {HT 1.64}, ♀♀ 1.66 (1.62–1.72), median length of head + pronotum: ♂♂ 2.03 (1.88–2.18) {HT 2.18}, ♀♀ 2.10 (1.97–2.15). Colour. Dorsally brown, lateral parts of pronotum and embolia with an orange hue. Head orange with variable, indistinct darker markings medially, eyes black. Scutellum darker than clavus and corium, right membrane with dark vermiculate pattern. Legs and prosternum orange-brown, meso- and metasternum velvety grey, metasternum with an orange tinge towards the rear. Abdominal venter brown to grey, laterally lighter. Structure. Anterior margin of head following the curvature of pronotum and eyes, not projecting. Median mark of interoculus indistinct, anterior width of vertex 1.3 times synthlipsis (1.34 / 1.04); head shorter than medial length of pronotum (1.17 / 1.34); length of eye 1.9 times its width (0.91 / 0.49); anteclypeus projecting 0.1 forward beyond labrum (Fig. 30). Labrum parallel-sided in basal half and converging to an acute tip in apical half, densely covered in dirty-white, short, adpressed, somewhat scale-like hairs; its basal width is equal to its median length (0.42 / 0.42). Pronotum with lateral angles obtusely rounded, maximum width 0.15–0.30 removed from posterior margin, central area lumpy but not distinctly elevated, lateral margin finely serrate, barely visible to Acta Musei Moraviae, Sci. biol. (Brno), 98(2), 2013 337 N. NIESER ET AL. Figs 4–9. Limnocoris spp., apex of abdomen, scale 1 mm. 4, 6, 8 – male, in dorsal view: 4 – L. lautereri sp.nov., paratype; 6 – L. pusillus Montandon, 1897; 8 – L. illiesi De Carlo, 1967. 5, 7, 9 – female, in ventral view: 5 – L. lautereri sp.nov., paratype, segment VIII removed; 7 – L. pusillus; 9 – L. illiesi. 338 Acta Musei Moraviae, Sci. biol. (Brno), 98(2), 2013 New species and synonymy in Limnocoris Figs 10–15. Limnocoris spp., mesosternum. 10–12 – Mesosternal carina, lateral view from the right side, scale 1 mm: 10 – L. lautereri sp.nov., paratype; 11 – L. pusillus Montandon, 1897; 12 – L. illiesi De Carlo, 1967. 13–15a – mesocarinal fossa in ventral view: 13 – L. lautereri sp.nov., paratype; 14 – L. illiesi De Carlo, 1967; 15 – L. pusillus Montandon, 1897; 15a – L. volxemi (Lethierry, 1877). indiscernible in dorsal view, about 30 teeth per mm in ventral view; maximum width less than twice anterior width (4.05 / 2.25), and 2.4 times the length of lateral section (4.05 / 1.66). Scutellum 2.3 times as wide as its median length (2.20 / 0.97) and 1.6 times as long as the claval commissure (0.97 / 0.62). Hemelytra leaving a narrow (0.10–0.15 wide) lateral strip of abdomen exposed. Embolium (Fig. 3) with lateral margin only slightly convex, smoothly curved, posterolateral angle virtually absent, its lateral margin indistinctly serrate, in most specimens hardly visible in dorsal view, about 26 teeth per mm in ventral view, width across embolium distinctly larger than maximum width across connexiva (4.7 / 4.3), claval suture absent, right membrane coriaceous, broadly rounded, covering left membrane, membranal suture absent. Left membrane well-developed, membranous. Hind wings strongly reduced, whitish, membranous, reaching over the base of abdomen. Covered part of abdomen waxy medium-rufous brown. Connexival segments not indented, forming a continuous lateral margin to abdomen, last segment with a small spine at the rear.
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