marine worms
DESCRIPTION
TRANSCRIPT
Marine Worms
Types of Marine Worms
Phylum Platyhelminthes – the flatwormsPhylum Nemertea – the ribbonwormsPhylum Nematoda – the roundwormsPhylum Chaetagnatha – the arrow wormsPhylum Pogonophora – the deep sea tubewormsPhylum Annelida – the segmented worms
Phylum Nemertea – the ribbonworms
Phylum Nematoda – the roundworms
Phylum Chaetagnatha – the arrow worms
Phylum Pogonophora – the deep sea tubeworms
Phylum Platyhelminthes – the flatworms-Ex: Tapeworms, Planaria, Parasitic Fluke-Some parasites, some free-living scavengers or predators-Some cause “Swimmers’ Itch”
Phylum Platyhelminthes cont.
• Flattened• No segments• Bilateral symmetry• Sexual & asexual
reproduction
Phylum Platyhelminthes cont.
• Mouth/Anus in same spot
• Simplest animal to have a CNS
• Light sensitive eyespots
• 3 cell layers
Phylum Annelida – the segmented worms
• Ex: earthworms, leeches, polychaetes (bristle worms)
• Bodies divided into ring-like sections
• More advanced of the worms
• Bilaterally symmetrical
Phylum Annelida cont.
• Coelom – fluid filled body space
• Between digestive tube and body wall – helps animal move, acts like a skeleton
Phylum Annelida cont.
• Other advances include:– Body systems (not present in more primitive
worms), i.e. digestive, nervous, circulatory (with blood, hemoglobin)
Phylum Annelida cont.
Annelida Lifestyles:-burrow-build tubes-sessile-swimming
Phylum Annelida cont.
Annelida Feeding Strategies:-Parasitic-Suspension feeding-Deposit feeding-Predators
My personal favorite Annelida - Nerius