[1][3] Trachelomonas cervicula is a species of algae that can be found in abundance in fresh water ponds.

[4] The species differs from other infusoria by the presence of the internal tubular prolongation.

Its holotype was collected in some abundance from a sheltered pond in the early part of February, 1890.

However, observations have been recorded in South America,[4] Europe,[3][6] and Southeast Asia.

[5] Trachelomonas cervicula has been observed in an environment highly polluted by thallium and other generally toxic heavy metal elements such as cadmium, lead and zinc.