Chapter 33: Pt 2. An Introduction To Invertebrates Flashcards Preview

Bio 94: Exam 3 > Chapter 33: Pt 2. An Introduction To Invertebrates > Flashcards

Flashcards in Chapter 33: Pt 2. An Introduction To Invertebrates Deck (65)
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1

What are rotifers?

Invertebrates in the Phylum Rotifera of the clade Lophotrochozoans that:

- are smaller than many protists
- has a corona (crown of cilia)
- has a toe that attaches to substrates
- has a series of stages during embryonic development

2

We don't see our chests ripple when our hearts beat because our digestive tract is surrounded by a ________.

Coelom

3

Lophophorates in the clade Lophotrochozoans include two phyla. What are they?

Phylum Ectopracta
Phylum Brachiopoda

4

What are the characteristics of the phylum ectopracta?

- invertebrates
- moss animals
- colony encased in a hard exoskeleton
> which is studded with pores that have lophophores extending from them

5

What are the characteristics of the phylum brachiopoda?

- lamp shells
- dorsal/ventral hinged shells

6

Do lophophorates have a true coelom?

Yes

7

What 3 main body parts do all molluscs in the phylum mollusca have?

What other features do molluscs have?

- muscular foot
- visceral mass
- mantle

- water filled mantle cavity
- rasplike radula (which they feed from)

8

What is the function of a muscular foot?

Movement

9

What is the function of a visceral mass?

Holds the internal organs of a mollusc

10

What is the function of the mantle?

A gold of tissue that drapes over the visceral mass and secretes a shell

- in some molluscs, the mantle extends beyond the visceral mass and produces a water filled chamber (mantle cavity)

11

What is the function of the mantle cavity?

Houses the gills, anus, and excretory pores.

12

What is the function of the radula?

Straplike organ that scrapes up food
- radula is made of chitin, scrapes algae off rocks

13

What are the 4 classes of the phylum mollusca?

1. Polyacophora (chitons)

2. Gastropoda (snails, slugs)

3. Bivalvia (clams, mussels, scallops, oysters)

4. Cephalopoda (squids, octopuses)

14

What are the characteristics of the class polyplacophora (chitons)?

- shells made of 8 dorsal plates
- allows it to roll up into a ball
- blends well into rocks
- muscular foot sucks onto rocks
- scrape algae off of rocks
- foot for locomotion
- has radula

15

What are the characteristics of the class gastropoda (snails)?

- single spiraled shell
- slugs lack a shell or have reduced shell
- torsion
- where the visceral mass is rotated to cause the animals anus and mantle to end up above it's head

16

What is torsion?

- where the visceral mass is rotated to cause the animals anus and mantle to end up above it's head
- a solution to life in a house with one entrenched

17

True or false:

All terrestrial molluscs are gastropods. All gastropods are terrestrial.

False

All terrestrial molluscs are gastropods. HOWEVER, not all gastropods are terrestrial.

18

What are the characteristics of the class bivalvia (clams, oysters)?

- two shelled molluscs
- two halves
- no radula (filter feeders)
- shells are very strong and hold them together

19

What are the characteristics of the class cephalopoda (squids)?

- most intelligent of all molluscs
- no shell
- muscular foot is modified into tentacles
- moves with get propulsion
- beaklike jaws

20

Which animal group has the largest number of extinctions?

Molluscs

21

What are annelids?

Invertebrates of the clade Lophotrochozoans that:

- belong to phylum annelida
- coelomages with bodies composed of fused rings

WORMS

22

What are the 3 classes of the phylum annelida?

- polychaeta (bristleworms)

- oligochaeta (earthworms)

- hirudinea (leeches)

23

What are the characteristics of the class polychaeta (bristleworms)?

- marine
- paddle like parapodia that aids in locomotion

24

What are the characteristics of the class oligochaeta (earthworms)?

- terrestrial

25

What are the characteristics of the class hirudinea (leeches)?

- freshwater
- parasites that suck up blood
- secretes a chemical called hirudin to prevent blood from coagulating (solidify)

26

Ecdysozoa is a clade of invertebrates with 3 phylums. What are they?

Phylum Nematoda (roundworms)

Phylum Tardigrada (water bears)

Phylum Arthropoda (insects/crabs)

27

What are the characteristics of the clade Ecdysozoa?

- has a tough coat called a cuticle
- perform ecdysis to shed their coat

28

What is a cuticle?

An exoskeleton made of layers of protein and chitin

29

What are the characteristics of the phylum nematoda (roundworms)?

- needs moist habitat
- infects moist tissues of animals
- has a cuticle
- has an alimentary canal
- abundant
- ecdysis

30

What are the characteristics of the phylum arthropoda (insects/crabs)?

- segmented bodies (head, thorax, abdomen)
> tagmata
- hard exoskeleton
- jointed appendages
- found in every habitat
- flight
- ecdysis