640px-Cystobranchus_vividus... commons.wikimedia.org

Maryland Biodiversity... www.marylandbiodiversity.co...

American shad hit by leech... www.mcall.com

Invert-E-Base Portal -... www.invertebase.org

Category:Cystobranchus -... commons.wikimedia.org

Invert-E-Base Portal -... www.invertebase.org

640px-CystobranchisRespiran... uk.wikipedia.org

Invert-E-Base Portal -... www.invertebase.org

Hirudinea | CABI Compendium... www.cabidigitallibrary.org

Marine Leeches of the... digitalcommons.unl.edu

List of Animal of Order... www.youtube.com

Hirudinea | CABI Compendium... www.cabidigitallibrary.org

Marine Leeches of the... digitalcommons.unl.edu

Marine Leeches of the... digitalcommons.unl.edu

Squalus acanthias |... www.shark-references.com

Extant species of sea... www.researchgate.net

Infestation of yellow... www.researchgate.net

Squalus acanthias |... www.shark-references.com

A - unfed leech, B - leech... www.researchgate.net

Representative images of... www.researchgate.net