Architecture of a lamellicorn flagellum (Phyllopertha horticola, scarabaeidae, coleoptera, insecta)

Abstract

The distal three of the seven flagellar segments of the scarabaeid beetle Phyllopertha horticola are lamelliform, gathered into a club, and possess five sensillar fields that are packed with sensilla placodea. The most proximal surface of the club bears only hair-shaped sensilla. On the inner four sensillar fields a narrow central elongated zone houses pit organs and cavities with sunken sensilla placodea and other sensilla. The most distal, fifth sensillar field is smooth. The sensilla placodea seem to be of several types. The only distinct difference between the sexes is the shorter and more rounded lamellae of the female. The total count of sensilla placodea in males outnumbers that of the females by about 60%.

Sexual dimorphism in antennal receptors of Phyllophaga ravida Blanchard (Coleoptera: Scarabaeoidea: Melolonthidae)

“…For example, both sexes of P. anxia and P. obsoleta have fi ve sensilla types (Ochieng et al 2002, Romero-López et al 2004. In other genera, there are cases in which a particular sex has two or three identical PLAS types, as in Phyllopherta horticola L. (Agren 1985), Adoryphorus couloni Burmeister (McQuillan & Semmens 1990), Anomala cuprea Hope (Leal & Mochizuki 1993), Phyllopherta diversa Waterhouse , and Dasylepida ishigakiensis Niijima & Kinoshita (Tanaka et al 2006). Results obtained for P. ravida are similar, although Table 4 Measurements of sensilla type auricilica on lamellae of both sexes of Phyllophaga ravida.…”

Sexual dimorphism in body dimensions and antennal sensilla in the white grub beetle, Dasylepida ishigakiensis (Coleoptera: Scarabaeidae)

“…The sex differences in antennal sensilla on the terminal lobes are thus likely to be related to the male's ability to find and recognize a conspecific female. The sexual dimorphism in numbers and, in some species, types of olfactory receptors is common (Hatfield et al, 1976;Harbach and Larsen, 1977;Agren, 1985;Jourdan et al, 1995) and it is suggested that males have some sensilla specialized for the perception of female pheromones (Chapman, 1982). This hypothesis should be tested for D. ishigakiensis in the future.…”

“…An emphasis was placed on the structures and abundance of antennal sensilla, because sexual dimorphism in antennal morphology is common among this group of insects. Although some information is available for other families of beetles (Daly and Ryan, 1979;Baker and Monroe, 1995;Yamasaki, 1996, 1998a, b;Bartlet et al, 1999;Merivee et al, 1999;Baker, 2001a, b), relatively few studies have been carried out on the sensillum structure of scarab beetles, with exceptions (Agren, 1985;Leal and Mochizuki, 1993). The main purpose of this paper is to describe the sexual dimorphism in body dimension and antennal sensilla in this grub beetle.…”

Novel antennal lobe substructures revealed in the small hive beetle Aethina tumida

“…Sexual dimorphism has been described in various insect species on different levels of the olfactory pathway ranging from the periphery to the central nervous system including the antenna (e.g. beetles: Kaissling, 1971;Âgren, 1985;Allsopp, 1990;Renou et al, 1998;Diptera: Clements, 1999;Ruther et al, 2000;Stocker, 2001;Hymenoptera: Steinzer et al, 2013;moths: Schneider, 1992;Rospars and Hildebrand, 2000;Huetteroth and Schachtner, 2005), the specificity, number and/or distribution of olfactory receptors (e.g. moths: Miura et al, 2009;Nakagawa et al, 2005 or Diptera: Bohbot et al, 2007), the morphology and number of glomeruli in the AL (Kondoh et al, 2003;Schachtner et al, 2005;Hu et al, 2011;Kelber et al, 2010;Streinzer et al, 2013), and higher order brain structures (e.g.…”