Limnomedusae
Limnomedusae are a group of small, freshwater jellyfish. They are closely related to marine jellyfish, but have adapted to life in freshwater environments. Limnomedusae are found worldwide, and are particularly abundant in lakes and ponds. They are typically less than 1 cm in diameter and are characterized by their bell-shaped body and tentacles. They are carnivorous, feeding on small invertebrates and plankton.
Common Names
Limnomedusae are commonly known as freshwater jellyfish, but they are not actually jellyfish in the true sense of the word. True jellyfish belong to the class Scyphozoa, while limnomedusae belong to the class Hydrozoa.
Characteristics
Limnomedusae have a number of characteristics that distinguish them from other hydrozoans. These include:
- A bell-shaped body with tentacles around the rim
- A single, central mouth
- A gastrovascular cavity for digestion
- A nervous system that allows for movement and response to stimuli
- A life cycle that includes both polyp and medusa stages
Environments
Limnomedusae are found in a variety of freshwater environments, including lakes, ponds, rivers, and streams. They prefer clear, well-oxygenated waters and are often found in areas with abundant vegetation. Limnomedusae can tolerate a wide range of temperatures and pH levels, but they are most abundant in warm, alkaline waters.