Green horse leeches (IMAGE) Society of Environmental Toxicology and Chemistry Caption Green horse leeches (Haemopis marmorata) were used for the gonad dissections. Credit Karen Kidd Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.