Bio Lab 9 - Coelomates

Question 1

Coelom

Answer 1

internal cavity, not gastrovascular

Question 2

Triploblastic

Answer 2

3 Layers:

• Endoderm
• Ectoderm
• Mesoderm

Question 3

Coelomate Types

Answer 3

Acelomate: no coelom
Psuedocoelomate: cavity between endo and mesoderm
Coelomate: cavity within mesoderm

Question 4

Phylum Platyhelminthes

Answer 4

Flatworms
Acelomates
Blind gastrocavity
No central circulation system
Diffusion limited so must be small
Swim 
Eyespot

Question 5

Neodermata

Answer 5

of Phylum Platyhelminthes

Parasitic sheep liver flukes

Question 6

Neodermata Life Cycle

Answer 6

1. Adult lives in sheep - sexual reproduction
2. Eggs are pooped out
3. Miracidium larvae swim in mud
4. Sporocyst rows into redia then cercaria in snails
5. Cercaria swim out of snail
6. Metacercarae crawl to grass to get eaten

Question 7

Tapeworm

Answer 7

Class Ceromeromorpha, Phylum Platyhelminthes

• suckers attach to the wall
• segments (proglotilids) grow out of the scolex
• Each segment produces eggs
• segments break off and regrow into new adults

Question 8

Phylum Nematoda

Answer 8

Round worms
Psuedocoelomates
3 Genuses

Question 9

Phylum Annelida

Answer 9

Earthworms, leeches
Coelomates
2 classes

Question 10

Class of Annelida

Answer 10

1. Polychaeta: mostly marine, 2 parapodia (feet) per segment
2. Clitellata:
   - earthworms and leeches
   - clitellum: band that wraps around during mating, then catches eggs, slides off and becomes a cocoon
   - hermaphrodites that play both roles when mating

Question 11

Dissections from this lab

Answer 11

1. Dugesia, also called planaria
   - Class Turbellaria, Phylum Platyhelminthes
2. Ascaris
   - Class Clitella, Phylum Nematoda

Question 12

Dugesia Important Parts

Answer 12

eyespot
gastrovascular cavity: opposite end of eyespots
pharynx: big hole in the middle
ectoderm
endoderm

Question 13

Tapeworm slide

Answer 13

See picture
Know: 
-scolex (round dots on one end)
-neck ( between scolex and segments)
-proglottids (segments)

Question 14

Turbatrix

Answer 14

Phylum Nematoda

clear until you add sand

Question 15

Ascaris

Answer 15

Phylum Nematoda, Class Clitella
Intestinal Roundworm
Know: 
-mouth
-pharynx
-intestines: long to digest plant matter
-anus
-pseudocoel
-seminal vesicles or receptacles