Download 3 Phyla of Worms – Notes - Effingham County Schools

3 Phyla of Worms – Notes
Common
 A long, thin invertebrate with BILATERAL symmetry, a nervous system, and
Characteristics
cephalization
of All Worms  Simplest animal to have a true organs like a __________________!
 Reproduction - Sexual (hermaphroditic – male and female __________________
First with
organs) and Asexual – Fission (breaking into pieces)
Organ Systems!  Many are __________________ (good/bad relationship) live on or in a host
Three Phyla
Characteristics
of Flatworms
A. Platyhelminthes __________________
B. Nematoda __________________
C. Annelida __________________
A. Soft flattened worms with true __________________ and internal organs.
B. Simplest animals to have bilateral symmetry and __________________
1. __________________-some carnivorous, most parasitic; one opening into gut;
pharynx sucks in food and releases waste
2. Respiration/ Circulation/ Excretion – No respiratory No circulatory system,
system; Obtain nutrients and oxygen by __________________ directly into cells.
Simple excretory system of specialized cells.
3. Response/Movement – __________________= groups of nerves in head control
nervous system (like a brain); “ladder” of nerves run over body;
__________________ detects light; move by __________________ and squirming
using outer layer of muscle tissue
Diseases caused
by Flatworms
Characteristics
of Roundworms
A. __________________-Usually infect internal organs of host – Example: The
blood fluke Schistosoma- causes tissue damage that could result in death
B. __________________ – Long, flat, and have adaptations for life inside intestines
of host
A. Body plan- First animals to have a one way digestive system with mouth and
__________________ (tube within in a __________________);
B. First animals to have a fluid filled body cavity called a __________________“false body cavity”
1. Feeding- many are __________________with grasping mouthparts, some
herbivores, many are parasites
2. Respiration/Circulation/ Excretion- No Respiratory or Circulatory Systems; rely
on __________________. Simple excretory organs.
3. Response/movement -have __________________ (brain) and simple nervous
system, have muscular system and move like snakes
Characteristics
of Roundworms
Continued
ONE-WAY
DIGESTIVE TRACK
Mouth and Anus
Diseases caused
by
Roundworms
Characteristics
of Segmented
worms
A. Trichinella causes painful __________________in the muscle tissue of humans
and other animals- transmitted by eating undercooked meat containing worm eggs
B. Filarial worms cause__________________- fluid buildup that causes abnormally
large limbs – transmitted through the bite of insects like mosquitos
C. Ascarids cause __________________in humans, horses, cows, etc by filling the
intestinal tract of its host and absorbing all nutrients
D. Hookworms attach to the__________________and __________________and
suck blood – common in humans(1/4 of world population); larvae pierce the skin &
burrow into the body. Can severely damage internal organs. Transmitted through
humans’ and other animals’ waste. (Wear Shoes!)
A. Body Plan- tube within a tube, digestive system with mouth and anus; body
divided into sections called __________________that are specialized for different
functions. First animals to have true circulatory system and coelom – body cavity.
1. __________________- predators to filter feeders; use pharynx to get food, stored
in __________________, ground up in gizzard, absorbed in intestine.
2. Circulation/ Respiration/ Excretion- __________________ circulatory system with
vessels; breath through gills or through skin; have excretory organs called nephridia
3. Response/Movement- have __________________ in each segment of the head,
nervous system; move by contracting and relaxing __________________
Intestine
__________
_________
_
_______
Dorsal blood vessel
_________
Aortic
arches
Brain
___________
Prostomeum- covers
mouth
Ventral Blood Vessel
_______
___
Ecology of
Segmented
Worms
Pharynx
Ventral Nerve Cord
Segments
A. Aerate, mix, and __________________ the soil- have created some of the most
fertile soils on earth!
B. Tunnels provide __________________for plant roots and water
C. Important in the __________________ of many other animals such as birds,
toads and snakes; marine annelids important in the diets of fishes, crabs, and lobsters