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

Zoology > Chapter 17: Annelids, Clade: Clitellata, Class: Hirudinida - Leeches > Flashcards

Flashcards in Chapter 17: Annelids, Clade: Clitellata, Class: Hirudinida - Leeches Deck (33):
1

Most live in what environments?

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

2

They are more common in what part zones?

- tropics temperate zones

3

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

- black, brown, red and olive green

4

Are most flattened or not flattened?

flattened

5

Some can be _____ feeding on invertebrates.
Others however can be ____ or ____ parasites.

carnivorous
temporary or permanent

6

What is their reproductive classification?

hermaphroditic

7

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

- clitellum

8

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

- fixed number
- more

9

They lack distinct coelomic compartments since they lack __.

- septa

10

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

- connective tissue
- spaces aka lacunae

11

Lacunae channels serve as what?

- auxiliary circulatory system

12

They have no setae but did develop __ for attachment.

suckers

13

The gut is specialized for what?

- storage of large quantities of blood

14

Most use the suckers to do what?

- attach and inchworm along surface

15

Not all leeches are parasites most are actually___?

predaceous

16

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

- proboscis

17

Some terrestrial leeches feed on what three things?

- insect larvae , earthworms and slugs

18

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

warm bloded vertebrates, baby birds

19

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

fluid feeders

20

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

breeding season , fish

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?

- gills
- across the epidermis
- nephridia
- Coelomocytes

22

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

- ring, pharynx
- fused ganglia

23

Nervous and Sensory systems:
There are 21 pairs of _____ in between along a double ___.

- segmental ganglia, double nerve cord

24

Nervous and Sensory systems:
The epidermis contains ____ and __.

- free sensory nerve endings and photoreceptors

25

Reproduction:
- They are hermaphroditic and practice ___.

- cross fertilization

26

Sperm is transferred by what?

hypodermic impregnation

27

The clitellum secretes a cocoon which?

-receives sperm and egg

28

Cocoons are okayed where?

buried in mud or damp soil

29

Development is similar to ___.

oligochaetes

30

The coelom is reduced because of what?

invasion of connective tissue and chloragogen tissue

31

For circulation they developed ___ and __.

- coelomic sinuses and channels

32

Some do have a typical oligochaete circulatory system meaning?

-coelomic system is auxiliary

33

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

- blood vessels
- coelomic sinuses

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