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Ontology for Parasite Lifecycle (OPL)

The Ontology for Parasite Lifecycle (OPL) models the life cycle stage details of various parasites, including Trypanosoma sp., Leishmania major, and Plasmodium sp., etc. In addition to life cycle stages, the ontology also models necessary contextual details, such as host information, vector information, and anatomical location. OPL is based on the Basic Formal Ontology (BFO) and follows the rules set by the OBO Foundry consortium.

Available Versions

Term Request/Submission

Everybody are welcomed to request/submit new terms to OPL. Please send your term request via OPL issue tracker:

For making new terms quickly available in OPL, we highly recommend you submit new terms with their definitions and related information using the EXCEL format template file. The template contains two worksheets, 'Parasite Organism' for new parasite organism terms, and 'Parasite Lifecycle stage' for new parasite life cycle stage terms. Download template

If you have any questions, feel free contact us by email.

Contact Us

  • Jie Zheng (jiezheng at upenn dot edu)
  • Priti Parikh (preets79 at gmail dot com)
  • Christian J. Stoeckert (stoeckrt at upenn dot edu)


Parikh PP, Zheng J, Logan-Klumper F, Stoeckert CJ Jr, Louis C, Topalis P, Protasio AV, Sheth AP, Carrington M, Berriman M, Sahoo SS. (2012) The Ontology for Parasite Lifecycle (OPL): towards a consistent vocabulary of lifecycle stages in parasitic organisms. J Biomed Semantics. 2012 May 23;3(1):5. PMID: 22621763. PMCID:PMC3488002