Protostomes pt.2

Question 1

What is segmentation?

Answer 1

Body form with a repeated series of units.

Question 2

Segments are divided internally by?

Answer 2

Septa

Question 3

What are some characteristics of Annelida-segmented worms?

Answer 3

1. 0.5mm-3m
2. Terrestrial, marine, and freshwater
3. Free-living and parasitic
4. Predators, detritivores, blood feeders, and herbivores.
5. Historically divided into 3 groups

Question 4

What are some examples of Annelida-Polychaeta?

Answer 4

Clamworms, scaleworms, lugworms, sea mice, tube worms

Question 5

What are parapodia?

Answer 5

Fleshy, foot-like projections on most segments

Question 6

What are chaetae?

Answer 6

Bristle like hairs or hooks

Question 7

What are some characteristics of Annelida-Oligochaeta?

Answer 7

1. Terrestrial worms including earthworms
2. Lack well-differentiated head
3. No parapodia, few chaetae
4. Hermaphroditic
5. Evolved for burrowing

Question 8

Characteristics of Annelida-Hirudinea?

Answer 8

1. Leeches
2. Mostly freshwater
3. Detritivores, predators, ectoparasites
4. Blood feeders produce hirudin which prevents blood coagulation.
5. Dorsoventrally flattened
6. Lack segments and chaetae
7. Suckers at both ends of the body

Question 9

Characteristics of Ecdysozoa?

Answer 9

1. Protostomes with a multi-layered cuticle
2. Growth by ecdysis-molting/shedding of cuticle
3. Includes nematoda, Tardigrada, Arthropoda

Question 10

Characteristics of nematoda?

Answer 10

1. Vinegar eels, eelworms, and other round worms
2. Ubiquitous-found everywhere
3. Bilaterally symmetrical and unsegmented.
4. Pseudocoelomate
5. Covered in thick cuticle
6. Eutely-fixed number of cells at maturity