American Society of Hirudotherapy

DNA barcoding reveals Mexican diversity within the freshwater leech genus Helobdella

DNA barcoding study published in Mitochondrial DNA (2010)

Last Updated: June 18, 2026Reviewed by: ASH Editorial Board
Research article — evidence reviewArticle reference
Evidence: Observational studyGenomics & ProteomicsOceguera-Figueroa A et al. · Mitochondrial DNA, 2010

Abstract

We investigated the genetic distances and taxonomic status among species of Helobdella, a genus of non-blood-feeding leeches, based on mitochondrial cytochrome c oxidase subunit I sequences. Sampling included 20 specimens representing nine nominal species collected in 11 states in Mexico as well as previously published sequences of different species of Helobdella from several places. A neighbor-joining tree, as well as identification of diagnostic nucleotides, was used to suggest the presence of seven species of Helobdella in Mexico including potentially two undescribed forms.

Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.

Publication typeComparative StudyJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, Non-P.H.S.
Indexed MeSH termsAnimalsDNA Barcoding, TaxonomicDNA, MitochondrialElectron Transport Complex IVEvolution, MolecularGenes, MitochondrialGenetic VariationLeechesMexicoMolecular Sequence DataPhylogenySpecies Specificity

Summary

DNA barcoding reveals seven Helobdella species in Mexico, including two potentially undescribed forms — expanding known North American freshwater leech diversity.

Why This Matters for Hirudotherapy

This study used mitochondrial cytochrome c oxidase subunit I sequences to assess genetic distances and taxonomic status among species of Helobdella, a genus of non-blood-feeding leeches, based on 20 specimens from nine nominal species collected across 11 Mexican states plus previously published sequences. Neighbor-joining analysis and diagnostic nucleotides suggested seven species present in Mexico, including potentially two undescribed forms. For ASH's domain, this work is only indirectly relevant: Helobdella leeches are explicitly described as non-blood-feeding and the study addresses biodiversity and taxonomy rather than therapeutic applications. No direct implications for clinical leech use, the leech secretome, or hirudotherapy practice are evident from the abstract.

Citation

DNA barcoding reveals Mexican diversity within the freshwater leech genus Helobdella.

Oceguera-Figueroa A et al. · Mitochondrial DNA, 2010

DOI

Added to ASH library: May 27, 2026 · Site last updated: June 18, 2026

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