Phylum Annelida | Earthworms

Why is Phylum Annelida famous?

First time we see a true body cavity

What are the two classes of Phylum Annelida

1.) Class Oligochaeta
Earthworms
2.) Class Hirudinea
Leeches

Name 3 characteristics of a Coelom

1.) Surrounds and contains the digestive tracts and other organs.
2.) Circulates nutrients around the body
3.) Act as Hydrostatic Skeleton.

Name the 14 structures of the Class Oligochaeta

2.) Linked Segments
3.) Brain
4.) Nerve cord
5.) Ganglia
7.) Prostomium
8.) Mouth
9.) Pharynx
10.) Crop
11.) Gizzard
13.) Anus
14.) Dorsal Blood Vessel
15.) 5 Aortic Arches
16.) Seminal Vesicles
17.) Seminal Receptacle
20.) Clitellum

What is the Structure of the Class Oligochaeta related to structure? Define them.

1.) Linked Segments: Segments of Lines that separate the worm into little rings.

What are the 3 Structures of the Class Oligochaeta related to the Nervous system? Define them.

1.) Brain: Controls the entire organism
2.) Nerve cord: Carries the nerve impulses from the brain to
3.) Ganglia: Delivers the nerve impulses to different segments.

What are the 5 Structures of the Class Oligochaeta related to the digestive system? Define them.

2.) Mouth: Where food enters

2.) Pharynx: MUscular organ that pushes dort down the digestive tract

3.) Crop: Stores dirt before it enters the gizzard

4.) Gizzard: Grinds dirt into fine particles

5.) Anus: Release waste from the body.

What are the 2 Structures of the Class Oligochaeta related to circulation? Define them.

1.) Dorsal Blood Vessel: Carries blood from the body to the head.

2.) 5 Aortic Arches: 5 simple hearts that Pumps blood throughout the body.

What type of circulatory system do Class Oligochaeta have?

Closed circulatory system.
(Blood Vessels)

What are the 3 Structures of the Class Oligochaeta related to the reproductive system? Define them.

Hermaphrodites
1.) Seminal Vesicles: Sperms are produced here.
2.) Seminal Receptacle: Receives sperm from another earthworm
3.) Clitellum: Produces eggs

How do Class Oligochaeta breathe? 2

1.) They do not have a respiratory system.
2.) Breathes via cutaneous respiration.

What is Cutaneous respiration?

Form of respiration which gas exchange by moving across skin. Oxygen enters and CO2 leaves. needs to be wet.

Define Class Hirudenea

Segmented parasites that suck blood from other animals.

What are the 2 substances that leeches release after attaching? and Why?

1.) Anesthetic To Go undetected
2.) Anti-Coagulants To Stop Blood from clotting

What are at the end of Leeches’ bodies?

Suckers.

What does Posterior end and anterior end mean

Back and front.

Cast meaning

earthworm poo