American Society of Hirudotherapy

Species Identification of Medicinal Leeches — Molecular Taxonomy

DNA-based resolution of the Hirudo medicinalis species complex

Last Updated: March 18, 2026Reviewed by: ASH Editorial Board
Research article — evidence reviewArticle reference
Genomics & ProteomicsSiddall ME et al. · Proceedings of the Royal Society B, 2007

Summary

Molecular phylogenetic study resolving the Hirudo medicinalis species complex using mitochondrial and nuclear markers. Demonstrated that what was historically considered a single species actually comprises multiple cryptic species with distinct geographic distributions, including H. verbana and H. orientalis.

Why This Matters for Hirudotherapy

Essential for regulatory and clinical standardization. The species distinction matters because H. verbana (not H. medicinalis sensu stricto) is the species most commonly used in clinical practice worldwide. Accurate species identification is critical for reproducible research and regulatory compliance.

Citation

Diverse Medicinal Leech Lineages and Their Species Identification

Siddall ME et al. · Proceedings of the Royal Society B, 2007

Added to ASH library: March 18, 2026 · Site last updated: March 18, 2026

This website provides educational information and does not constitute medical advice, diagnosis, or treatment recommendations. Medicinal leech therapy carries clinically meaningful risks and should be performed only by qualified clinicians under institutionally approved protocols. FDA 510(k) clearance for medicinal leeches is limited to specific indications; investigational and off-label discussions are labeled accordingly. For patient-specific guidance, consult a qualified healthcare provider.

Species Identification of Medicinal Leeches — Molecular Taxonomy | ASH