Chapter 17: Annelids, Clade: Clitellata, Class: Hirudinida - Leeches

Question 1

Most live in what environments?

Answer 1

• freshwater

L> but some are marine or live in moist terrestrial environments

Question 2

They are more common in what part zones?

Answer 2

• tropics temperate zones

Question 3

They vary in colour, what four are the most common?

Answer 3

• black, brown, red and olive green

Question 4

Are most flattened or not flattened?

Answer 4

flattened

Question 5

Some can be _____ feeding on invertebrates.

Others however can be ____ or ____ parasites.

Answer 5

carnivorous

temporary or permanent

Question 6

What is their reproductive classification?

Answer 6

hermaphroditic

Question 7

They only form a ____ during breeding season which secretes a cocoon for reception of eggs.

Answer 7

• clitellum

Question 8

They usually have a ___ of segments but appear to have ___ due to superficial annuli.

Answer 8

• fixed number

- more

Question 9

They lack distinct coelomic compartments since they lack __.

Answer 9

• septa

Question 10

In most, the coelomic cavity is filled with ___ and ___ aka ___.

Answer 10

• connective tissue

- spaces aka lacunae

Question 11

Lacunae channels serve as what?

Answer 11

• auxiliary circulatory system

Question 12

They have no setae but did develop __ for attachment.

Answer 12

suckers

Question 13

The gut is specialized for what?

Answer 13

• storage of large quantities of blood

Question 14

Most use the suckers to do what?

Answer 14

• attach and inchworm along surface

Question 15

Not all leeches are parasites most are actually___?

Answer 15

predaceous

Question 16

Freshwater leeches have a ___ for ingesting small invertebrates as well as to suck blood.

Answer 16

• proboscis

Question 17

Some terrestrial leeches feed on what three things?

Answer 17

• insect larvae , earthworms and slugs

Question 18

Other terrestrial leeches climb trees or bushes to reach ____ and give an ex:?

Answer 18

warm bloded vertebrates, baby birds

Question 19

Most are ___ that prefer tissue fluids and blood pumped from open wounds.

Answer 19

fluid feeders

Question 20

Some parasitic leeches leave a host during _____ but ___ leeches may remain on the host.

Answer 20

breeding season , fish

Question 21

Respiration and excretion:

• Some fish leeches have?
• All other leeches gaseous exchange occurs where?
• they have 10-17 pairs of?
• What cells may assist in excretion?

Answer 21

• gills
• across the epidermis
• nephridia
• Coelomocytes

Question 22

Nervous and Sensory systems:
Two Brains:
- Anterior fused ganglia form a ___ around the __.
- Seven pairs of posterior ___.

Answer 22

• ring, pharynx

- fused ganglia

Question 23

Nervous and Sensory systems:

There are 21 pairs of _____ in between along a double ___.

Answer 23

• segmental ganglia, double nerve cord

Question 24

Nervous and Sensory systems:

The epidermis contains ____ and __.

Answer 24

• free sensory nerve endings and photoreceptors

Question 25

Reproduction:

- They are hermaphroditic and practice ___.

Answer 25

• cross fertilization

Question 26

Sperm is transferred by what?

Answer 26

hypodermic impregnation

Question 27

The clitellum secretes a cocoon which?

Answer 27

-receives sperm and egg

Question 28

Cocoons are okayed where?

Answer 28

buried in mud or damp soil

Question 29

Development is similar to ___.

Answer 29

oligochaetes

Question 30

The coelom is reduced because of what?

Answer 30

invasion of connective tissue and chloragogen tissue

Question 31

For circulation they developed ___ and __.

Answer 31

• coelomic sinuses and channels

Question 32

Some do have a typical oligochaete circulatory system meaning?

Answer 32

-coelomic system is auxiliary

Question 33

Some lack ___ and have ___ which serve as only vascular system

Answer 33

• blood vessels

- coelomic sinuses