Heliozoa

Part of speech: noun

Definitions

1. A group of single-celled aquatic organisms characterized by radiating thread-like projections that extend outward from their spherical bodies
2. Microscopic protozoans distinguished by their star-shaped appearance, created by numerous fine pseudopodia radiating from a central cell body
3. Solitary aquatic protists identifiable by their spherical form and delicate radiating arms of cytoplasm used for capturing food particles

Etymology: Heliozoa are a group of mostly freshwater single-celled organisms, and the name is a plain Greek compound rather than a story about a person. It combines "helios," the Greek word for the sun, with "zoia," the plural of "zoion," meaning animal, so the name translates literally as "sun animals." The name refers to the fine, radiating pseudopodia (thin threadlike extensions) that spread from the cell's surface like the rays of the sun. The group was named in the nineteenth century, when naturalists were building classification systems for microscopic life from classical roots. Their scientific names are coinages of that period, so the Greek parts describe what the observers saw under the microscope rather than anything ancient Greek writers knew about these creatures.