Cepheidae
Cepheidae is a family of jellyfish belonging to the order Rhizostomeae. These jellyfish are characterized by their distinctive mushroom-shaped bells and their lack of tentacles. Instead, they have numerous, branching oral arms that they use to capture prey. Cepheidae are found in warm and temperate waters worldwide, often in coastal areas and estuaries.
Common Names
Members of the Cepheidae family are commonly known as "flattened jellyfish" or "disc jellyfish" due to their flattened bell shape. Other common names include "mushroom jellyfish" and "crown jellyfish".
Characteristics
Cepheidae have several distinguishing features:
- Flattened, mushroom-shaped bell: Their bell is typically wider than it is tall, giving them a distinctive flattened appearance.
- Absence of tentacles: Unlike many other jellyfish, Cepheidae lack stinging tentacles.
- Branched oral arms: They possess numerous, highly branched oral arms that extend from the underside of the bell. These arms are covered in adhesive cells that capture prey.
- Lack of a manubrium: A manubrium is a central mouth structure found in many jellyfish. Cepheidae lack this structure.
- Gelatinous bell: Their bell is made up of a gelatinous substance, similar to other jellyfish.
Environment
Cepheidae are primarily found in warm and temperate waters around the world. They often inhabit coastal areas, estuaries, and lagoons. They prefer environments with moderate water flow and ample prey availability.