Clava
Clava is a genus of colonial hydroids belonging to the family Clavidae. These marine invertebrates are characterized by their distinctive, club-shaped colonies, which are often referred to as “clavers”. Clava hydroids are found in a variety of marine environments, ranging from shallow intertidal zones to deeper waters.
Common Names
Clava hydroids are commonly known as "club hydroids" or "clavers".
Characteristics
Clava hydroids exhibit several key characteristics that distinguish them from other hydroids. These include:
- Club-shaped colonies: Clava colonies are typically club-shaped or cylindrical, with a central stalk that branches out into numerous polyp-bearing branches.
- Polyps: The polyps of Clava hydroids are typically small and numerous, and they are responsible for feeding and reproduction.
- Hydrothecae: Clava polyps are housed within protective, cup-like structures known as hydrothecae. These hydrothecae are often arranged in distinct patterns along the branches of the colony.
- Gonothecae: Clava colonies also produce reproductive structures called gonothecae. These gonothecae are usually located near the tips of the branches and contain the developing medusae (the free-swimming, jellyfish-like stage of the hydroid life cycle).
Environments
Clava hydroids are found in a variety of marine environments, including:
- Intertidal zones: Clava hydroids can often be found attached to rocks, seaweed, or other substrates in the intertidal zone.
- Subtidal zones: Some species of Clava are also found in subtidal zones, at depths of up to several meters.
- Estuaries: Clava hydroids can tolerate brackish water conditions and are sometimes found in estuaries.