Unit 6 Terms - Platyzoa and Mesozoa

Question 1

Triploblastic

Answer 1

Three germ layers

Question 2

Acoelomate

Answer 2

Without a coelom

Examples: Acoelomorphs, platyhelminths, gastrotrichs, gnathostomulids, and probably micrognathozoans and mesozoans

Question 3

Parenchyma

Answer 3

The filling between the ectoderm and endoderm found in acoelomates

Question 4

Pseudocoelomate

Answer 4

Partially lined with mesoderm

Examples: Rotifers and acanthocephalans

Question 5

Eucelomate

Answer 5

Completely lined with mesoderm

Question 6

Phylum Acoelomorpha Characteristics

Answer 6

Translation: Not hollow form
Small flatworms less than 5mm in length
Entirely aquatic, mostly marine
Bilateral symmetry
Triplobastic
Gut absent or incomplete
Monoecious
No excretory or respiratory system
Dorsoventrally flattened

Question 7

Fragmentation

Answer 7

Asexual Reproduction in Acoelomorphs

Question 8

Monoecious

Answer 8

Bear both sperm and egg

Question 9

Dioecious

Answer 9

Produce only sperm or egg, never both

Question 10

Endolecithal

Answer 10

Yolk-filled eggs produced by acoelomorphs