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Hypopharynx in termites: Morphological and functional aspects.

Iago Bueno da Silva1, Ana Maria Costa-Leonardo1

  • 1Laboratório de Cupins, Departamento de Biologia, Instituto de Biociências, UNESP - Univ Estadual Paulista, Av. 24A, No. 1515, 13506-900 Rio Claro, SP, Brazil.

Micron (Oxford, England : 1993)
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Summary
This summary is machine-generated.

Termite hypopharynx morphology varies between one-piece (OP) and multiple-piece (MP) termites, influencing water intake and social behaviors like trophallaxis. This study details these differences for the first time.

Keywords:
IsopteraMouthpartScanning microscopySensilla

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Area of Science:

  • Entomology
  • Comparative Morphology
  • Insect Ecology

Background:

  • The hypopharynx, a mouthpart in insects, plays a crucial role in feeding and water intake.
  • Understanding its morphology can provide insights into termite social structure and ecological adaptations.
  • Previous studies have not comparatively analyzed hypopharynx morphology across different termite subfamilies and castes.

Purpose of the Study:

  • To conduct the first comparative study of hypopharynx morphology in workers, pseudergates, and soldiers of Isoptera (termites).
  • To investigate the relationship between hypopharynx structure, termite lifestyle (one-piece vs. multiple-piece feeding), and social behaviors.

Main Methods:

  • Scanning electron microscopy was used to examine the hypopharynx morphology of termites from six families.
  • The study included 4 one-piece (OP) and 9 multiple-piece (MP) termite species.
  • Detailed analysis of hypopharynx trichome arrangement and sensilla types was performed.

Main Results:

  • Significant differences in hypopharynx trichome distribution were observed between OP and MP termites, and among castes within OP termites.
  • MP termites, particularly workers, showed abundant trichomes facilitating external water source exploitation.
  • Soldiers, in both OP and MP groups, generally had fewer trichomes, suggesting reliance on workers for water and food via trophallaxis.
  • Three types of sensilla (chaetica, basiconica, campaniformia) were identified, indicating roles in chemoreception and mechanoreception.

Conclusions:

  • Hypopharynx morphology in termites is strongly correlated with their ecological habits and feeding strategies.
  • Differences in trichome density reflect adaptations for water acquisition, with MP termites better equipped for external sources.
  • The findings support the hypothesis of worker-soldier interdependence in resource acquisition, mediated by trophallaxis.
  • Sensilla on the hypopharynx contribute to sensory perception crucial for feeding and environmental interaction.