Abstract
The present paper describes sensory structures on the apical segment of the labium in representatives of the subfamily Peiratinae (Heteroptera: Reduviidae), using the scanning electron microscope. The study is based on dry material representing 19 species and 16 genera. Within Peiratinae thirteen morphologically distinct types of sensilla were identified. Among them were four new types of sensilla (porous placodea sensillum [PPLS], multilobate sensillum [MS], domeelongated sensillum [UDES], and pit peg sensillum type 2 [NPPS2]) were found. Mechanosensilla are evenly distributed on the surface of the labium and form a characteristic pattern in various species. The main characters of the third visible (apical) segment of the labium are: presence of different sized sensilla of the chaetica type 1, 2, and 3; trichodea sensilla (TS); campaniform sensilla (CS); and various types of nonporous pit peg sensilla (NPPS1, NPPS2, and NPPS3). Distally on the apical segment of the labium dome-elongated sensilla (UDES) there are a characteristic arrangements, described as (3+3) and (1+2). Chemical sensilla are grouped on the tip of the labium. The position, number, and types of chemical sensilla on this area are very similar in all studied species.References
Altner, H. & Prillinger, L. (1980) Ultrastructure of invertebrate chemo-, termo-, and hygroreceptors and its functional significance. International Review of Cytology, 67, 69–139.
Bérenger, J.M. (1995) Notes sur les Hémiptères Réduviides de Zambie. Bulletin de la Société entomologique de France, 100 (5), 451–454.
Berenger, J., Gil-Santana, H., Pluot-Sigwalt, D. & Blanchet, D. (2006) Une remarquable nouvelle espece dans le genre Rasahus (Heteroptera, Reduviidae, Peiratinae). Nouvelle Revue d’Entomologie, 23(3), 283–287.
Cai, W. & Lu, J. (1990) A taxonomic revision of the Chinese species of Sirthenea Spinola (Hemiptera: Reduviidae: Peiratinae). Entomotaxonomia, 12 (2), 85–96.
Cai, W.Z. & Tomokuni, M. (2004) Taxonomic notes on Vietnamese Peiratinae, with description of a new species (Hemiptera: Reduviidae). Oriental Insects 38, 85–94.
Cai, W. & Taylor, J.S. (2006) Lentireduvius, a new genus of Peiratinae from Brazil, with a key to the New World genera (Hemiptera: Reduviidae). Zootaxa, 1360, 51–60.
Catalá, S. (1996) Sensilla associated with the labium of eight species of Triatominae. Journal of Morphology, 228, 195–201.
Catalá, S. (1997) Antennal sensilla of Triatominae (Hemiptera: Reduviidae): a comparative study of five genera. International Journal of Insect Morphology & Embryology, 26, 67–73.
Catalá, S., Tomasi, V., Hliba, E. & Rovasio, R. (1998) The cave organ in Triatominae (Hemiptera, Reduviidae) antennae: An olfactory receptor?. Biocell, 22, 1–7.
Catalá, S. & Schofield, C. (1994) Antennal sensilla of Rhodnius. Journal of Morphology, 219, 193–204.
Chapman, R.F. (1998) The insects, structure and function. Cambridge University Press, 770 pp.
Chłond, D. (2008a) A new species of Sirthenea Spinola, 1840 (Heteroptera: Reduviidae: Peiratinae) from Laos. Oriental Insects (42), 385–389.
Chłond, D. (2008b) A new species of Sirthenea Spinola (Heteroptera: Reduviidae: Peiratinae) from Vietnam. [In:] L. Borowiec, D. Tarnawski (eds). The importance of natural history museum of taxonomy. Polish Taxonomical Monographs, Wrocław, 15, 139–146.
Chłond, D. (2008c) A new species of Lestomerus Amyot & Serville, 1843 (Heteroptera: Reduviidae: Peiratinae) from Cameroon. [In:] L. Borowiec, D. Tarnawski (eds). The importance of natural history museum of taxonomy. Polish Taxonomical Monographs, Wrocław, 15, 131–138.
Cobben, R.H. (1978) Evolutionary trends in Heteroptera. Part II. Mouthpart-structures and feeding strategies. Maded. Landbouwhogesschool, Wageningen 78, 407 pp.
Coscarón, M.C. (1995) A new Neotropical genus of Peiratinae (Reduviidae, Heteroptera). Revista Brasileira de Entomologia, 39, 453–457.
Coscarón, M.C. (1996) Synonimizing Spilodermus Stål under Peirates Serville, and revision of the resulting P. quadrinotatus species group (Heteroptera: Reduviidae: Peiratinae). Proceedings of the Entomological Society of Washington, 98 (3), 500–508.
Coscarón, M.C. (1997) Froeschnerisca nom. nov. for the junior homonym of Froeschneriellia Coscarón (Heteroptera: Reduviidae). Physis, Sec. C. 54, 49.
Coscarón, M.C. & Morrone, J.J. (1995) Systematic, cladistic, and biogeography of the Peirates collarti and P. lepturoides groups (Heteroptera: Reduviidae, Peiratinae). Entomologica Scandinavica, Vol. 26 (2), 191–228.
Gil-Santana, H.R. & Costa, L.A.A. (2003) Um novo gênero e espécie de Peiratinae de Nova Friburgo, Rio de Janeiro, Brasil (Hemiptera, Heteroptera, Reduviidae). Revista Brasileira de Zoologia, 21, 3–8.
Maldonado Capriles, J. (1990) Systematic Catalogue of the Reduviidae of the World (Insecta: Heteroptera). (Special edition of the Caribbean Journal of Science). University of Puerto Rico, Mayagüez, Puerto Rico, 694 pp.
McIver, S. & Siemicki, R. (1984) Fine structure of antennal mechanosensilla of adult Rhodnius prolixus Stal (Hemiptera, Reduviidae). Journal of Morphology, 180, 19–28.
Moulet, P. (2001) Two new palearctic Reduviidae (Hemiptera, Heteroptera) with notes on synonymy. Nouvelle Revue d'Entomologie, 17(3), 197–203.
Putshkov, V.G. & Putshkov, P.V. (1985) A Catalogue of Assassin-bugs Genera of the World (Heteroptera, Reduviidae). VINITI, Moskva, 138 p.
Ren, S. (1990) New species of genus Ectomocoris Mayr from China (Heteroptera: Reduviidae: Piratinae). Acta scientiarum naturalium Universitatis Nankinensis, 1, 69–79.
Rosa, J.A., Brata, M.S., Cilense, M. & Belda Neto, F.M. (1999) Head morphology of 1st and 5th instar nymphs of Triatoma circummaculata and Triatoma rubrovaria (Hemiptera, Reduviidae). International Journal of Insect Morphology & Embryology, 28, 363–375.
Vennison, S.J. & Ambrose, D.P. (1990) A new species of Piratinae (Insecta: Heteroptera: Reduviidae) from southern India. Environmental Ecology (Kalyani), 8 (1), 43–46.
Weirauch, C. (2003) Pedicellar structures in Reduviidae (Heteroptera) – comments on cave organ and trichobothria. European Journal of Entomology, 100, 571–580.