Lesson 23 lecture notes Flashcards
What are some characteristics of all arthropods?
bilateral symmetry
jointed appendages
exoskeleton
segmented bodies- head, thorax, and abdomen
what is a fused head and thorax called?
a cephalothorax
what sort of nervous system do arthropods have?
ventral- two ganglia and a nerve cord
what sort of circulatory system do arthropods have?
open- hemolymph flows over cells from a heart emptying onto the nearby organs
What are some characteristics of class insecta?
3 body segments 6 walking legs wings at some stage pair of antennae compound eyes
what are the labrum and labium?
upper and lower lips
where are the wings of an insect located?
1 pair on the meso thorax
1 pair on the metathorax
the abdomen of insects is divided into how many sections?
10-12 spiracles on each segment allow air into
what is a tracheal breathing system?
system of tubes that runs through the insect
what are the stages of complete metamorphosis?
egg fertilized larvae emerge chrysalis or pupa stage- cocoon internal reorganization insect emerges as adult
what are the stages of incomplete metamorphosis?
egg is fertilized
hatches as nymph
adult is final molt after last instar (period)
subphylum chelicerates have
claw-like appendages
2 body sections
arachnids have no
wings or antennae
arachnids have protective
exoskeletons
arachnids have mouthparts located
under chelicerae
