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Morphology, ultrastructure, and implied function of ciliated sensory structures on the developmental stages of

Bronwen Cribb1, Leslie Chisholm, Robert Gould

  • 1Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland 4072, Australia. b.cribb@mailbox.uq.edu.au

Microscopy Research and Technique
|September 25, 2003
PubMed

Insights

The study tracked dorsal sensilla in Merizocotyle icopae monogeneans infecting shovelnose rays. Larval Type 1 sensilla are lost upon host attachment, while Type 2 and adult Type 3 sensilla play roles throughout development.

Area of Science:

  • Parasitology
  • Marine Biology
  • Ultrastructural Morphology

Background:

  • Monogeneans are ectoparasites that infect fish and other aquatic animals.
  • Dorsal sensilla are sensory structures found on the surface of monogeneans.
  • Understanding the function of sensilla is crucial for comprehending host-parasite interactions.

Purpose of the Study:

  • To investigate the development and fate of dorsal sensilla in Merizocotyle icopae during its life cycle.
  • To characterize the different types of dorsal sensilla present in larval and adult stages.
  • To infer the potential functions of these sensilla based on their morphology and presence at different developmental stages.

Main Methods:

  • Experimental infections of shovelnose rays (Rhinobatos typus) with Merizocotyle icopae.
  • Scanning electron microscopy (SEM) to examine surface structures.
  • Transmission electron microscopy (TEM) to analyze ultrastructural details of sensilla.

Main Results:

  • Three distinct types of uniciliate dorsal sensilla (Type 1, Type 2, and Type 3) were identified.
  • Larvae predominantly possess Type 1 sensilla, which are shed approximately 24 hours post-infection.
  • Type 2 sensilla are retained from larval to adult stages, with a distinct adult form emerging; Type 3 sensilla are unique to adults.

Conclusions:

  • Type 1 sensilla likely function as chemo- or mechanoreceptors for host location by infective larvae.
  • Type 2 sensilla are important sensory structures throughout the monogenean's life cycle.
  • Type 3 sensilla appear to mediate functions specific to the adult parasite on the host surface.

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