Applied Entomology and Zoology

, Volume 51, Issue 4, pp 641–651 | Cite as

Sexual difference in antennal sensilla abundance, density and size in Callosobruchus rhodesianus (Coleoptera: Chrysomelidae: Bruchinae)

  • Katsuto Fukuda
  • Aya Yanagawa
  • Midori Tuda
  • Gen Sakurai
  • Satoshi Kamitani
  • Naruto Furuya
Original Research Paper

Abstract

Sexual difference in antennal sensilla size and per area density has rarely been studied in insects. The bruchine seed beetle Callosobruchus rhodesianus (Pic) (Coleoptera: Chrysomelidae: Bruchinae) is distributed over Central and Southern Africa and is a pest of stored legume seeds, especially cowpeas Vigna unguiculata. Here, we study the type, abundance, morphology and per area density of antennal sensilla on each antennal segment and their sexual differences in C. rhodesianus. The antennae of normal individuals consist of the scape, pedicel and nine flagellomeres as in other congeneric species. Sizes of most antennomeres are larger in males than in females. We observed the following eight different types of antennal sensilla: sensilla trichodea types 1 and 2 (ST1, ST2), sensillacavitae (SCa), sensilla chaetica (SC), sensilla basiconica types 1, 2 and 3 (SB1, SB2, SB3) and Böhm bristles (BB). The SCa is found on all antennomeres unlike in congeners (C. chinensis and C. maculatus). The ST1, the most numerous and longest antennal sensilla type, is denser and thinner in females than in males but more abundant in males than in females. Since the ST1 is considered to serve as a chemoreceptor, the sexual difference in the ST1 may benefit males in searching for mates.

Keywords

Antennal sensilla Bean beetle Bruchidae Callosobruchus rhodesianus Sensilla per area density Sensory hair thickness 

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Copyright information

© The Japanese Society of Applied Entomology and Zoology 2016

Authors and Affiliations

  • Katsuto Fukuda
    • 1
  • Aya Yanagawa
    • 2
  • Midori Tuda
    • 3
    • 4
  • Gen Sakurai
    • 3
    • 5
  • Satoshi Kamitani
    • 6
  • Naruto Furuya
    • 7
  1. 1.Graduate School of Bioresource and Bioenvironmental SciencesKyushu UniversityFukuokaJapan
  2. 2.Research Institute for Sustainable HumanosphereKyoto UniversityUjiJapan
  3. 3.Institute of Biological Control, Faculty of AgricultureKyushu UniversityFukuokaJapan
  4. 4.Laboratory of Insect Natural Enemies, Department of Bioresource Sciences, Faculty of AgricultureKyushu UniversityFukuokaJapan
  5. 5.National Agriculture and Food Research OrganizationInstitute for Agro-Environmental SciencesTsukubaJapan
  6. 6.Entomological Laboratory, Faculty of AgricultureKyushu UniversityFukuokaJapan
  7. 7.Laboratory of Plant Pathology, Faculty of AgricultureKyushu UniversityFukuokaJapan

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