Arthropods Flashcards
How common are arthropods?
75% if all species
How did arthropods get their name?
jointed legs
Characteristics of arthropods
segmented, jointed, and hardened exoskeleton
What is the exoskeleton made of?
chiton
Whatis inside the appendages, and what does it allow?
muscles between joints
precise movement of each apendents
What do arthropods lack?
cilia that can move
How are different arthropod groups assorted?
number of appendages on each body segment
specialization of groups of segments (tagmata)
What does myriapod mean?
myriad of legs
What do chelicerates possess? (3)
chelicerae as first pair of appendages
2 tagmata- cephalothorax and abdomen
no antennae
What two animals are often mistaken for chelicerates?
crabs
shrimp
What are characteristics of pancrustaceans? (3)
appendages in head for feeding
brain divided into three parts
similar DNA sequences
What are remipedians, and what is unique about them?
crustaceans in sea caves
more closely related to hexapods than crustaceans
WHat are characteristics of crustaceans? (4)
2 pair of antennae
2 pairs of maxillae
biramous (2 branched) appendages
nauplius stage (Larvae)
What is the maxillae?
bones that form jaw
