Please enable JavaScript.

Coggle requires JavaScript to display documents.

Cnidaria - Coggle Diagram

- - - - Found in Britain
      - Up to 100 tentacles
      - Characterised by phenotypic variation: variations in observable characteristics of an individual
    - - Intertidal and subtidal
      - At low tide they contract all the tentacles into the body in order to reduce desiccation.
    - - This group of corals produce skeletons based on accumulation of calcium carbonate
      - This group contains the organisms with the longest lives (each polyp ~ few years; each colony:~30-40 years); they also form large colonies
    - - Sea pens look different from other anthozoans
      - They have a stem called Rachis, supporting the polyps
      - The stem is attached to a peduncle that anchors the colony to the ground
- - - - found all around UK and Mediterranean
      - Characteristics:
      - About 30 cm length
      - 32 lobes: 4 lobes with tentacles passing food to the mouth; 24 tentacles with nematocysts to capture prey
    - - 40-50cm
      - All around uk
- - - - Move by shelf propulsion
      - Feeding on benthic organisms (e.g. shrimps)
      - Bioluminescence
    - - Small benthic hydroids living to up to 200 metres
      - Prey of nudibranchs (seaslugs) : in some areas one might find only the stalks because the sea slugs eat the tentacles
    - - An air filled structure called Pneumatohpore and a structure similar to a sail
      - The polyps in the colony are specialized for different functions:
      - Dactylozoids: defence (the long tentacles)
      - Gastrozoids: feeding
      - Gonozoids: reproduction