Arthropods 1 Flashcards
1
Q
Ventral nervous system
A
paired/fused longitudinal nerve chords
2
Q
Heteronomous metamery
A
A reduction in metamerism (annelids)
3
Q
Chelicerates
A
anterior region two appendages (mouthparts) often 4 pair walking legs prosoma opisthosoma no antennae chelicerae and pedipalps
4
Q
Arachnida
A
Protein threads (spinnerets -> web), pulling rearranges liquid polymer molecules into solid, flexible thread
5
Q
Hexapoda, proturans
A
wingless relatives of insects,
6
Q
Hexapoda, insect
A
1 pair antennae
thorax – 3 pairs of legs attached
abdomen – no appendages
7
Q
Myriapods
A
many legs (centipedes 1 segment 2 legs and millipedes 1 segment 2 pairs of legs)
8
Q
Support
A
External skeleton (protein+chitin) secreted by underlying epidermis (500MYA)
9
Q
Brain
A
anterior brain that surrounds digestive tract
10
Q
Basics
A
protostomes, bilateral symmetry
