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Publications (7)      

1. Barta, John R. & Roy T. Sawyer. 1990 Definition of a new genus of glossiphoniid leech and a redescription of the type species, Clepsine picta Verrill, 1872 Canadian Journal of Zoology 68(9): 1942–1950.
2. Sawyer, Roy T. 1986 Leech Biology and Behaviour Clarendon Press, Oxford. Vol. 2 Feeding Biology, Ecology, and Systematics: i–xiv; 419–793; (1)–(33) (page numbers of Index are enclosed in parentheses).
3. Sawyer, Roy T. 2019 Description of the Southern swamp leech Philobdella floridana (Verrill, 1874) (Annelida: Hirudinea) from the Outer Banks, North Carolina, USA, with a revision of the species Zootaxa 4544(2): 189–213.
4. Sawyer, Roy T. 2019 Observations on the terrestrial leech Haemopis septagon Sawyer & Shelley, 1976 (Annelida: Hirudinea) from the Outer Banks, North Carolina, USA, with a revision of the species Zootaxa 4658(2): 275–296.
5. Sawyer, Roy T. 2021 Description and taxonomic analysis of a tuberculated turtle leech from the Outer Banks, North Carolina, USA, provisionally identified as Placobdella multilineata Moore, 1953 (Hirudinea: Glossiphoniidae) Zootaxa 4991(1): 1–35.
6. Sawyer, Roy T. 2024 Biology, morphology and taxonomy of a snail-feeding leech from North Carolina, USA, provisionally identified as Helobdella lineata (Verrill, 1874) (Glossiphoniidae): First evidence for extra-oral digestion in the Hirudinea Zootaxa 5453(2): 151-182.
7. Sawyer, Roy T. & M. G. White. 1969 A new genus and species of marine leech, Glyptonobdella antarctica, from an Antarctic isopod British Antarctic Survey Bulletin(22): 1-14.