Differences between regular and irregular echinoids
- Created by: Brad_ers_B
- Created on: 12-06-15 18:40
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- Differences between regular and irregular echinoids
- Mode of life
- Benthonic, Epifaunal, Vagrant on the seabed, High Energy
- Benthonic, Infaunal, Lives in burrows, Low Energy
- Feeding
- Uses jaws to graze on seabed, algae which grows on rock
- Filter feeds
- Symmetry
- Five-fold radial (5 planes)
- Bilateral (1 plane)
- Ambulacra
- Run from cntre of aboral surface to oral surface
- Run from centre of aboral surface but terminate forming petaloid ambulacra
- Interambulacra
- Run from centre of aboral to the oral surface
- Modified over test. Fused together over oral. Maybe modified e.g. one forming the plastron
- Function of tube feet
- Respiration, attachment and movement
- Respiration, digging and maintaining the burrow/anal tube
- Fascioles
- Absent
- Two present, one to direct water to mouth, one to direct waste away
- REGULAR
- IRREGULAR
- Mode of life
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