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