foxsciencecentre.weebly.com€¦ · web viewbiology 11 ap: annelidapage 1. name:date: phylum...
Post on 21-Sep-2020
2 Views
Preview:
TRANSCRIPT
Name: Date:
Phylum Annelida: Segmented Worms
Domain: Kingdom:
References: Text 681-683. This is required reading!
Shape of Life, Chapter 4: Annelida Body Plan
-Segmented worms belong to Phylum Annelida, which means ____________________
in Latin.
-Annelids are different from other worms we have talked about because their bodies are
segmented and they possess a true coelom.
Biology 11 AP: Annelida Page 1
Annelida Common Characteristics and Evolutionary Advances
a) Segmentation
-In Annelida, the basic body plan is divided
into segments with external body rings and
internal septa. What is segmentation an
evolutionary advantage?
___________________________________
___________________________________
___________________________________
___________________________________
________________________________________________________________________
________________________________________________________________________
b) Coelom Development
-Annelids have a fluid-filled coelom, which functions in:
i) Movement: ____________________________________________________________
________________________________________________________________________
ii) Protection: ____________________________________________________________
Biology 11 AP: Annelida Page 2
c) Movement
-Locomotion involves the alternation
of two muscle groups. Each segment
has its own circular and longitudinal
muscles.
d) Embryological Development
-Annelids are protostomes because ___________________________________________
Biology 11 AP: Annelida Page 3
Annelida Classes
1. Class Oligochaeta: Earthworms
- Earthworms are classified as Oligochaeta because they have relatively few __________
Biology 11 AP: Annelida Page 4
Use the diagram to comment on
earthworm respiration.
__________________________
__________________________
__________________________
__________________________
__________________________
________________________________________________________________________
________________________________________________________________________
Comment on their digestive system.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
Biology 11 AP: Annelida Page 5
________________________________________________________________________
2.Class Hirudinea: Leeches
*Use text page 683 to write your own notes about leeches
_____________________________________________________
_____________________________________________________
_____________________________________________________
_____________________________________________________
_____________________________________________________
Biology 11 AP: Annelida Page 6
_____________________________________________________
_____________________________________________________
3. Class Polychaetes: Bristle Worms
Polychaetes are often called bristleworms because each of the body segments has an upper and lower bundle of bristles (called setae or chaetae) on each side. In free-living polychaetes, the bristles, combined with snake-like body waves, help the worm to move along. In Fireworms, Eurythoe spp (A), the bristles have evolved into defensive organs. They are fragile, hollow tubes filled with poison. They are easily broken when the worm is touched and the pain they cause when they pierce the skin makes their common name very appropriate.
The bristles found in worms that live in tubes or burrows (sessile or sedentary) have often evolved hooks to help anchor the worm in place. Sedentary worms make a whole variety of homes. Many make a hard calcareous tube (C-Spororbis), which is attached to a hard surface or even large algae. Other sedentary worms have a leathery tube, sometimes decorated with pieces of broken shell, or sand and mud particles.
Free-living worms include carnivores, herbivores and scavengers. Some, such as the fireworms, are active carnivores feeding on colonial animals eg: sponges and ascidians). On the other hand, sedentary worms, (which cannot move about), usually feed on microscopic plants and animals or fine particles. Many sedentary worms filter plankton out of the water by a crown of feathery tentacles that surround their mouth and give them their common name of 'fanworm' or 'feather duster' worm (B)
Biology 11 AP: Annelida Page 7
Biology 11 AP: Annelida Page 8
top related