Lesson #8 - Deep-sea Cnidarians POWERPOINT
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Orange Sea
Pen Biology
• Diet – plankton caught with tentacles
on feathery plumes
• Hunting technique – orients body at
right angles toward current capturing
plankton
• Relocates at will
• Starfish predators – Leather star
(Dermasterias imbricata) & Sunflower
seastar (Pycnopodia helianthoides)
Breeding:
• Autozooids produce egg & sperm
& expel them through mouth
into water column
• Planula larvae drift as plankton
before settling on seabed
• Substrate settled larvae undergo
metamorphosis
• Newly formed juveniles -
primary founding colonial polyps
Image credit: Fred Hsu
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