Noncoelomate Invertebrates- Chapter 33 Flashcards Preview

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Flashcards in Noncoelomate Invertebrates- Chapter 33 Deck (66)
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1

What are the general characteristics that all animals share?

heterotrophs
multicellular
lack a cell wall
ability to move
diverse in form
diverse in habitat
embryonic development
tissues and tissue layers


2

the hypothesis that states we came from a line of multinucleate ciliates

the multinucleate hypothesis

3

hypothesis that states we came from a line of colonial flagellates, favored by molecular systematics

colonial flagellate hypothesis

4

event that led to an enormous expansion of animal diversity 525 MYA, major phyla born

Cambrian explosion

5

What gene complex evolved from the Cambrian explosion?

Hox developmental gene

6

lack symmetry and tissues

parazoa

7

have symmetry and tissues

eumetazoa

8

two germ layers

diploblastic

9

have three germ layers

triploblastic

10

the only kind of parazoan

porifera (sponges)

11

lack defined tissue and organs, disaggregate and aggregate their cells, include sponges

Parazoa

12

include marine and freshwater species, larval sponges are free swimming, adults are anchored

sponges

13

inner layer (porifera) of specialized flagellated cells called __________ or collar cells

choanocytes

14

central layer (porifera) gelatinous protein-rich matrix called the ________, includes calcium or glass __________, fibers made of the protein _________

mesophyl
spicules
spongin

15

outer layer (porifera)

protective layer

16

porifera are filter feeders, as the choanocyte flagella draws water through numerous small _____, this process is known as _____________

pores
intracellular digestion

17

small organisms are filtered from the water, exit the sponge through the _______

osculum

18

porifera reproduce asexually through _______, and reproduce sexually through the meeting of egg and sperm

fragmentation

19

Does parazoa have any true tissues?

no

20

Does eumetazoa have any true tissues?

yes

21

all other animals aside from porifera, 2 or 3 layers, distinct and well defined tissues, irreversible differentiation for most cell types

eumetazoa

22

Parazoa has___ symmerty, eumetazoa has ________ symmerty

no
radial

23

include Cnidaria and Ctenophora, branch out before bilateria, have radial symmetry and only two germ layers

diploblasts

24

outer layer, similar to the ectoderm

epidermis

25

inner layer, similar to the endoderm

gastrodermis

26

in-between the epidermis and and the gastrodermis, non-cellular and jelly

mesoglea

27

nearly all marine, bodies have distinct tissue but no organs, exclusively carnivorous

cnidarians

28

cnidarians can be either ______ or _________

polyp
medusa

29

cylindrical and sessile

polyp

30

umbrella-shaped and free-living

medusa