1 porifera

Question 1

Phylum Porifera

Answer 1

Sponges (pore bearer)

Question 2

2 types 0f epithuliloid cell layers

Answer 2

pinacoderm (outer) and choanoderm (inner)

Question 3

What lies between the pinacoderm and the choanoderm?

Answer 3

mesohyl - connective tissue

Question 4

How many species of sponges?

Answer 4

about 8000 - most SW about 150 FW

Question 5

small pores

Answer 5

ostia - water enters here

Question 6

large opening

Answer 6

osculum - water leaves here

Question 7

Water flow is created by?

Answer 7

the flagella of specialized cells called choanocytes

Question 8

sponges are what type of eaters?

Answer 8

filter feeders

Question 9

3 classes of porifera

Answer 9

hexactinellida, calcarea and demospongia

Question 10

class hexactinellida

Answer 10

glass sponges - have six rayed siliceous spicules called hexactines; tissue organized syncytial called trabeculum

Question 11

class calcarea

Answer 11

calcareous sponges - tissue organized cellular; calcareous spicules (monaxons, triaxons and teraxons)

Question 12

class demospongiae

Answer 12

demosponges - tissue organized cellular; siliceous spicules and spongin

Question 13

3 different degrees of complexity

Answer 13

asconoid, syconoid and leuconoid

Question 14

asconoid

Answer 14

choanocytes line the inner surface of the central chamber called the atrium or spongocoel; thes sponges can only reach 1 cm tall

Question 15

syconoid

Answer 15

have outpockets in their body wall where choanocytes are located; these are called choanocyte chambers

Question 16

leuconoid

Answer 16

thick body walls riddled with thin channels that widen into choanocyte chambers; largest sponges; central atrium is often small