Larval Digenean Parasitizing Amphibian Hosts from the Argentinian Chaco Region

Area of Science:

• Parasitology
• Amphibian Ecology
• Biodiversity Studies

Background:

• Larval digenetic trematodes reveal intermediate host information, host distribution, and environmental changes.
• Amphibians are crucial hosts for digenetic trematodes, yet systematic studies on larval digeneans in these hosts are limited.
• The Argentinian Chaco Region presents unique ecoregions for studying host-parasite interactions.

Purpose of the Study:

• To analyze the diversity of larval digenetic trematodes in adult amphibians from the Argentinian Chaco Region.
• To contribute to the systematics of larval digeneans in amphibians.
• To provide insights into potential intermediate hosts and parasite-host biodiversity.

Main Methods:

• Examined 167 adult amphibians (frogs and toads) from the Dry Chaco and Humid Chaco ecoregions.
• Collected specimens between June 2002 and December 2019.
• Utilized light microscopy and scanning electron microscopy (SEM) for detailed morphological analysis.

Main Results:

• Identified fourteen larval digenetic trematode taxa from families Diplostomidae, Proterodiplostomidae, and Strigeidae.
• Infections found in various locations including body cavity, mesentery, muscle, spinal cord canal fluid, and cranial cavity.
• Detailed descriptions, illustrations, and brief life cycle discussions provided for all identified species.

Conclusions:

• The study enhances understanding of mesocercariae and metacercariae morphology, morphometry, and diversity in amphibians.
• Findings contribute to identifying potential intermediate hosts for digenetic trematodes.
• Results serve as an indicator of parasite and host biodiversity within the Gran Chaco ecoregions.