Crinoids
- Created by: rosie.may7
- Created on: 02-05-16 16:33
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- Crinoids
- Echinodermata, Crinoidea
- Mode of life
- Sessile
- Sea lilies
- nektonic
- Feather stars
- Sessile
- Morphology
- Calyx
- Houses the soft parts of the organism
- Brachia
- Delicate structures which move in the current collecting particles of food using cilia
- Stem
- composed of calcite ossicles, linked by soft tissue
- Anal tube
- removes waste material without it coming into contact with fresh water
- Ossicle
- Calcite plates which make up the stem
- Holdfast
- Attaches organism to the substrate
- Calyx
- Ordovician to recent
- Extant
- abundant in the upper palaeozoic
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