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Related Experiment Video

Updated: Jun 6, 2026

Visualization of Proprioceptors in Drosophila Larvae and Pupae
09:51

Visualization of Proprioceptors in Drosophila Larvae and Pupae

Published on: June 13, 2012

Orientation mechanisms and sensory organs involved in host location in a dipteran parasitoid larva.

José E Crespo1, Claudio R Lazzari, Marcela K Castelo

  • 1CONICET, Grupo de Investigación en Ecofisiología de Parasitoides (GIEP), Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, 4to piso, (C1428EHA) Buenos Aires, Argentina. crespo@ege.fcen.uba.ar

Journal of Insect Physiology
|November 17, 2010
PubMed
Summary
This summary is machine-generated.

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Robber fly larvae use chemical cues detected by maxillary palps to locate scarab beetle hosts underground. This chemoklinotaxis guides their parasitic behavior, crucial for understanding this agricultural pest.

Area of Science:

  • Entomology
  • Chemical Ecology
  • Insect Behavior

Background:

  • Mallophora ruficauda, a robber fly, is a significant pest to apiculture in Argentina.
  • Larvae of M. ruficauda are ectoparasitoids of scarab beetle larvae, locating hosts after wind dispersal.
  • The precise host-location mechanism and sensory organs used by M. ruficauda larvae were previously unknown.

Purpose of the Study:

  • To investigate the sensory mechanisms and chemical cues used by Mallophora ruficauda larvae for host location.
  • To determine if host location relies solely on chemical cues and to identify the involved sensory organs.

Main Methods:

  • Behavioral experiments were conducted in a laboratory setting.
  • Larval orientation responses to hosts and host extracts were tested.

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  • Sensory organs, specifically maxillary palps, were manipulated (unilateral and bilateral ablation) to assess their role.

    • Main Results:

    • Mallophora ruficauda larvae utilize chemosensilla on their maxillary palps to detect host chemicals.
    • Orientation is possible with a single maxillary palp, but ablation of both abolishes host-finding behavior.
    • A hexane extract of the host body proved as attractive as live hosts, indicating chemical mediation.

    Conclusions:

    • Larvae of Mallophora ruficauda locate hosts underground via chemoklinotaxis, a directed movement along chemical gradients.
    • Maxillary palps are essential sensory organs for detecting host cues and enabling orientation.
    • Chemical cues from the host are sufficient to elicit host-searching behavior in M. ruficauda larvae.