Marine Worms

1
Marine Worms

• Flatworms, Nematodes, Annelids,

2
General Characteristics of Marine Worms

• bilateral symmetry
• Cephalization (Has a head)
• Hydrostatic skeleton (no bones)
• most are benthic

3
Flatworms2 types

• No body cavityflatbodies
• _No_ segments, No_ circulatory system, No
  Respiratory system
• _Type 1_Turbellarians (Non Parasitic)
• _Type 2_ flukes and tapeworms (parasitic)

4
Swimmers itch
5
Flatworms

• Most turbellarians are _carnivorous
• __Chemoreceptors_ detect prey
• unique prey-capturing mechanisms
• _Stab__
• _Suffocate_
• pharynx secretes enzymes and pulls in food
• food is digested in the gastrovascular cavity
  which functions as a mouth and an anus__.

6
Flatworms

• Reproduction
• _Asexually through regeneration
• _Sexually_ Penis Fencing (flatworms are male and
  female. They fight with their peniss the winner
  becomes the male, looser becomes the female)

7
Nematodes

• _round worms, tapered at both ends
• _No segments___
• _They have a body cavity_ Hence why round in
  shape
• __Most numerous animals on the planet__
• Handful of sediment may contain 3 million
  nematodes
• http//www.youtube.com/watch?vgofmShLJIPMsafety_
  modetruepersist_safety_mode1

8
Nematods

• Nonparasitic species are scavengers and are small
  in size__
• Parasitic and carnivorous species are larger_

9
Annelids

• Bodies divided into _Segments_
• Has _a closed circulatory system__
• more advanced worm
• Setae used for locomotion and defense
• Polychaetes (Not a bird) ? are the main type of
  marine worm For example, earthworm is an
  annelid, but it is not a polychaete

? common marine polychaetes ? deep sea vent
tube worms
10
Annelids
? errant polychaete
featherduster?

• Polychaetes Annelids 2 Types
• _Type 1 Sedentary polychaetes that burrow or
  built tubes of sand, calcium carbonate, proteins.
  They filter feed_with cilia that extend from
  tubes and the aid of chemoreceptors.

11
My Favorite
Sedentary Polychaetes _Christmas Tree
Worms_ Also used in Avatar IN Real Life Use
their gills to capture plankton
12

• Polychaetes Annelids 2 Types
• Type 2 _Errant (swim)_polychaetes have jaws with
  teeth_ and nocturnally hunt small invertebrates.
  Many are poisonous and have a painful bite.

13
Sexual Reproduction in Polychaetes

• _Epitoky_ is a form of reproduction ,The worms
  undergo a transformation into an _Epitoke, a
  pelagic morph capable of _Sexual Reproduction.
• Often an epitoke is the end part of the worm,
  which separates from the head. The end then
  releases the eggs or sperm.
• .

14
Other Marine Worms

• _Peanut Worms_ Filter Feeder that burrows in the
  sand, sticking out its head to feed

15
Other Marine Worms

• _Spaghetti worms__ lies hidden in sediment or
  rocky crevices while its food-gathering tentacles
  wave overhead.

16
Other Marine Worms

• Fire worms have bristles that are filled with
  venom and easily break when touched to discourage
  predators. They also inflict a painful rash on
  any human who handles them

17
Aliens or Marine Worms?
New Species, of marine worms Yet still to be
named..
18

• Marine Worms
• Name the three types/classifications of worms
• List them from simple to complex
• List three characteristics of each type of worm
• Give two examples of sexual reproduction for
  worms
• Describe two ecological roles of marine worms.
• What is swimmers itch?
• Define Sedentary, Cephalization, Benthic,
  Errant, Polychaete and gastrovascular cavity
• 7.