DIVERSITY, HOST RANGE, AND SPECIFICITY OF ECHINOSTOMES (FAMILY ECHINOSTOMATIDAE; LOOSS, 1899) IN THE MIDWESTERN...

Area of Science:

• Parasitology
• Ecology
• Molecular Biology

Background:

• Echinostomatidae trematodes are globally distributed parasites.
• They utilize snails as first intermediate hosts and aquatic/semi-aquatic animals as definitive hosts.
• North American freshwater systems are heavily populated with these parasites.

Purpose of the Study:

• To expand sampling of echinostomes in the midwestern United States.
• To genetically characterize 12 echinostome lineages using ND1, ITS2, and 28S sequences.
• To identify novel host-parasite combinations and understand host specificity.

Main Methods:

• Collected and sequenced genetic material (ND1, ITS2, 28S, COI) from 12 echinostome lineages.
• Performed phylogenetic analysis on snail first intermediate hosts.
• Examined host-parasite specificity across different snail species and families.

Main Results:

• Generated novel genetic sequences for 12 echinostome lineages.
• Identified new host-parasite associations through COI barcoding and phylogenetic analysis.
• Demonstrated that echinostomes exhibit broader specificity, often targeting snail families rather than single species.

Conclusions:

• Echinostome parasites are not strictly host-specific to individual snail species.
• Host specificity appears to extend to families of aquatic snails.
• First intermediate snail hosts may be a significant factor driving the speciation of echinostomes.