Cell and Tissue Research

, Volume 226, Issue 2, pp 309–318 | Cite as

External structure of the sensillum capitulum, a hygro- and thermoreceptive sensillum of the cockroach, Periplaneta americana

  • Y. Tominaga
  • F. Yokohari


The antennal hygro- and thermoreceptive sensillum (sensillum capitulum) of the cockraoch, Periplaneta americana, has been identified electrophysiologically and examined by scanning electron microscopy. It appears basiconic and has a characteristic cuticular apparatus; a mushroom-shaped inner stem and a non-perforated outer wall. The head of the inner stem, which is a cap of about 0.5 μm diameter, protrudes from the distal margin of the outer wall. The inner stem is not perforated, though in some cases a tiny hollow is observed in the apex of the cap. This kind of cuticular apparatus is not found in other sensilla and may be modality-specific to hygro- and/or thermoreception. The sensillum capitulum occurs singly on the distal part of each alternating segment of the flagellum and on each segment of some distal meristal segments.

Key words

Hygroreceptive sensillum Cockroach Antenna External structure 


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Copyright information

© Springer-Verlag GmbH & Co. KG 1982

Authors and Affiliations

  • Y. Tominaga
    • 1
  • F. Yokohari
    • 2
  1. 1.Biological LaboratoryFukuoka UniversityFukuokaJapan
  2. 2.Department of BiologyKyushu UniversityFukuokaJapan

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