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Carbon-dioxide sensing structures in terrestrial arthropods.

G Stange1, S Stowe

  • 1Research School of Biological Sciences, Australian National University, Canberra ACT 0200, Australia. stange@rsbs.anu.edu.au

Microscopy Research and Technique
|December 22, 1999
PubMed
Summary

Scientists identified and described carbon dioxide (CO2) sensory structures in various arthropods, revealing specialized sensilla clusters in insects, chilopods, and ixodids. These structures feature CO2-sensitive neurons with unique dendritic branching for enhanced detection.

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Area of Science:

  • Zoology
  • Sensory Biology
  • Entomology

Background:

  • Atmospheric carbon dioxide (CO2) detection is crucial for many arthropods.
  • Previous knowledge on the specific structures and cellular mechanisms of CO2 sensing in diverse arthropod groups was limited.

Purpose of the Study:

  • To identify and describe the subcellular structures responsible for detecting atmospheric carbon dioxide.
  • To investigate the distribution and organization of these sensory structures across various arthropod taxa.

Main Methods:

  • Subcellular-level examination of sensory structures in adult Lepidoptera, Diptera, Hymenoptera, Isoptera, Chilopoda, and Ixodidae, as well as in lepidopteran larvae.
  • Microscopic analysis of sensilla morphology, including wall-pore type sensilla, pits, and capsules.

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  • Examination of central nervous system projections in Lepidoptera and mosquitoes.

    • Main Results:

    • Identified clusters of wall-pore type sensilla forming distinct sensory organs, often recessed, in various arthropods.
    • Located these CO2 sensory structures on palps or antennae (insects), head capsule (chilopods), and forelegs (ixodids).
    • Observed CO2-sensitive receptor neurons with enlarged dendritic processes (cylindrical branches or lamellar structures) and associated microtubules.

    Conclusions:

    • The study provides a detailed subcellular description of CO2 sensory structures across a range of arthropod taxa.
    • The findings highlight conserved features in CO2 detection mechanisms, including specialized dendritic structures and neural pathways.
    • This research advances our understanding of chemosensation in arthropods and the evolution of sensory systems.