Lecture 17

Question 1

Crustacea morphology

Answer 1

2 pairs of antennae and 3 pairs of food-processing appendages attached to head
Other appendages = biramous

Question 2

Crustacea environment

Answer 2

Aquatic

Question 3

Crustacea stratigraphic range

Answer 3

Upper Cambrian-recent

Question 4

Ostracoda morphology

Answer 4

Two small CaCO3 valves

Question 5

Ostracoda ecology

Answer 5

Aquatic
Pelagic and/or benthic
Vagile
Frequent sexual dimorphism
Growth through successive mutations

Question 6

Ostracoda stratigraphic range

Answer 6

Cambrian-present

Question 7

Ostracodes furca

Answer 7

Aids locomotion

Question 8

Malacostraca examples

Answer 8

Crabs, lobster, shrimp

Question 9

Malacostraca

Answer 9

Diverse
Marine, freshwater, terrestrial
Highly evolved internal structure

Question 10

Carcinization

Answer 10

Form of convergent evolution in which non-crab decapod crustaceans tend to evolve into crabs
First recognized over a century ago that crabs had evolved from different crustacean lineages
Tendency to develop a flatter, broader carapace, with abdomen becoming hidden under the body

Question 11

Chelicerata

Answer 11

Claw-like mandibles (mouthparts)
Merostomata (e.g., sea scorpions = eurypterids)
Arachnida (e.g., spiders)

Question 12

Chelicerata stratigraphic range

Answer 12

Cambrian-recent