Chapter 33-Noncoelomate and Pseudocoelomate Invertebrates Flashcards Preview

Biology II > Chapter 33-Noncoelomate and Pseudocoelomate Invertebrates > Flashcards

Flashcards in Chapter 33-Noncoelomate and Pseudocoelomate Invertebrates Deck (42):
1

What is in phyla porifera

sponges

2

What are parazoa

Simple animals lacking tissues, most lack a definite symmetry (asymmetric)

3

Larval sponges

Free swimming motile

4

Adult sponges

remain attached-sessile

5

How does water enter and exit a sponge

enters through ostia and exits osculum

6

What is the mesohyl (middle layer) of a sponge made of

-spicules-needles of calcium carbonate or silica
-spongin-reinforcing tough protein fibers

7

What are choanocyte

they engulf and digest food from passing water
-collar cells-move water through sponge; absorb nutrients

8

How do sponges asexually reproduce

fragmentation-piece breaks off and attaches elsewhere to form new sponge

9

Describe sexual reproduction in a a sponge

Hermaphrodite
-choanocytes transform into sperm
-captured and passed to egg cell in mesohyl
-development can occur in mother or in open water

10

What layer of a sponge provides protection

Mesohyl

11

What are Eumetazoa

All animals except sponges-distinct tissues

12

what type of symmetry do Cnidaria exhibit

Radial symmetry

13

What are organisms called with only 2 germ layers

diploblastic

14

What are nematocysts

stinging cells found on tentacles of cnidarians

15

What are the 2 forms of Cnidarians

Polyps: cylindrical and sessile
Medusa: umbrella-shaped and motile

16

what does the gastrovascular cavity do for the cnidarian

gives it a hydrostatic skeleton to support itself with

17

What are Anthozoans

Cnidaria
sea anemones, corals
-all polyps

18

What are Cubozoa

Cnidarians
-box jellies, strong swimmers, fatal stingers

19

What are hydrozoa

Cnidarians
-hydra, portuguese man of war
-both polyp and medusa forms, has freshwater members

20

What are Syphozoa

Cnidarians
-Jellyfish
-ring of muscle allows for rhythmic contractions for propulsion

21

What are staurozoa

Star jellies
-resembles a medusa in most ways but is attached to substrate

22

Describe Phylum Ctenophora

Comb jellies
-radial symmetry
8 rows of fused cilia that beat in coordination
-bioluminescent

23

What do Ctenophores use to capture prey

2 tentacles covered with Colloblasts
-discharge strong adhesive used to capture prey

24

How are bilaterians classified

by their coelom
-acoelomates
-pseudocoelomates
-coelomates

25

What phylum are flatworms in

Platyhelminthes

26

Describe flatworms

Ciliated, bilaterally symmetrical, Acoelomates, many are parasitic

27

What do Platyhelminthes lack

A circulatory system
-simple diffusion for gas transport

28

what category are tapeworms in

Platyhelminthes

29

how do tapeworms absorb their food

directly through body walls

30

What do flame cells do for Platyhelminthes

help with excretion of fluids and other substances

31

How do platyhelminthes reproduce

most are hermaphroditic,
can undergo sexual reproduction
asexual regeneration

32

what are the 2 major groups of flatworms

Class Turbellaria-free living
Neodermata-parasitic
-class trematoda-flukes
-class cercomeromorpha-tapeworms

33

What is one of the most important trematode to human health

blood flukes

34

How do tapeworms stay in the body

hang onto inner wall of host intestine using scolex

35

Describe Phylum Acoelomorpha

Have primitive nervous system and lack digestive cavity
-once considered part of platyhelminthes

36

Describe Cycliophora (phylum)

Acoelomates
-live on mouthparts of claw lobsters
-circular moith surrounded by ring of cilia

37

What does the Pseudocoelomic fluid do

performs the fuctions carried out by a circulatory system in most coelomate animals

38

What are in Phylum Nematoda

Nonsegmented, round worms
-marine, freshwater, parasites, free-living

39

Nematode characteristics?

Bilaterally symmetrical and unsegmented
-Pseudocoelom

40

How do Nematodes reproduce

Separate male and female worms
-smaller males have a hooked end

41

Lifestyle of nematodes?

Many are active hunters
-others are parasites of plants and animals

42

What are in Phylum Rotifera

Bilaterally symmetrical, unsegmented pseudocoelomates
-highly developed internal organs
-conspicuous ring of cilia at anterior end used for locomotion and sweeping food into mouth