Related Experiment Video
Updated: Jul 16, 2025
08:58
Colonization of Euprymna scolopes Squid by Vibrio fischeri
Published on: March 1, 2012
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Polymorphic parasitic larvae cooperate to build swimming colonies luring hosts
Darya Krupenko1, Aleksei Miroliubov2, Emil Kryukov3
1Department of Invertebrate Zoology, Saint Petersburg University, Saint Petersburg 199034, Russia.
Current Biology : CB
|September 23, 2023
Summary
Parasitic flukes form unique swimming colonies of specialized larvae, resembling prey to infect hosts. This cooperative colonial strategy offers novel insights into parasite transmission and evolution.
Area of Science:
- Parasitology
- Evolutionary Biology
- Marine Biology
Background:
- Parasites exhibit diverse adaptations for host transmission, especially in free-living stages.
- Digenean flukes (parasitic flatworms) possess free-living larval cercariae with varied structures and behaviors.
- Some cercariae aggregate to mimic prey, enhancing transmission success.
Purpose of the Study:
- To describe a novel, prey-mimetic colonial aggregation of digenean cercariae.
- To investigate the functional specialization and genetic identity of different cercaria morphotypes within the colony.
- To understand the cooperative mechanisms and evolutionary implications of this colonial behavior.
Main Methods:
- Live observation of cercariae behavior.
- Light, electron, and confocal microscopy for structural analysis.
- Analysis of 18S, 28S, and 5.8S rRNA genes for phylogenetic identification.
Main Results:
- A colonial aggregation of two distinct cercaria morphotypes (sailors and passengers) was observed.
- Sailor morphotypes facilitated colony motility, while passenger morphotypes were specialized for infection.
- Phylogenetic analysis confirmed both morphotypes belong to the digenean family Acanthocolpidae, likely genus Pleorchis, with identical ribosomal RNA genes.
Conclusions:
- This study reveals a unique example of cooperation between morphologically and functionally distinct individuals of the same species to form a colonial organism for infection.
- This cooperative strategy in parasitic flatworms parallels insect caste systems.
- The findings provide novel insights into the evolution of complex transmission strategies in parasites.
Keywords:
AcanthocolpidaePlatyhelminthescercariaedigeneadivision of laborfluke worm and prey mimetismparasiteparasite transmissionpolymorphic colonyMore Related Videos
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