1: Arthropods: Crustaceans Flashcards
1
Q
Crustaceans are mostly aquatic, name an exception.
A
Woodlice!
1
Q
Briefly describe the evolution of the Crustacean body plan
A
Tagmatisation and adaptive radiation of appendages
Head and thorax now combined = cephalothorax
2
Q
Describe the body plan of crustaceans
A
2 pairs of antennae
1-3 thoracic appendages may be incorporated into head (maxillipeds)
Appendages → biramous
3
Q
Describe the repro system of Daphnia (water flea)
A
Parthenogenetic → asexual
Sexual repro when conditions are harsh
4
Q
Describe the repro system of the Barnacle
A
Hermaphrodite
Release sperm to other barnacles
Some barnacles have the largest penis to body ratio in the animal kingdom
5
Q
Why do barnacles have no abdomen?
A
Hox gene (Abdominal-A) has been lost
6
Q
Crustaceans appendages are __ramous
A
Biramous
