practical lab 3 part 3
what body plan do anthropodes have
coelomate
cause of success in anthropods
hard exoskeleton and jointed limbs
cray fish
aquatic arthropods who eat anything
external anatomy of crayfish
cephalothorax (fused head and thorax), abdomen, chitinous exoskeleton, carapace, rostrum (front of head) , stalked eyes, antennae, mouth, telson (tail)
weakness of crayfish
when freshly molted, they are helpless to predators
crayfish appendages functions
swimming, feeding, and walking
copulatory swimmerets
the first two appendages on male crayfish that have been adapted for mating
digestive system of crayfish
digestive gland, mouth, esophagus, stomach, intestine, gastric mill, anus
excretory organs in crayfish
green glands
excretory organs in grasshoppers
Malpighian tubes
mandibular muscles
operate the mandibles
respiratory system of crayfish
gills
circulatory system of crayfish
open, prominent heart receiving blood from the hemocoel and pumping it into vessels, in animals where oxygen is not as important there are no respiratory pigment (insects)
ostia
small holes in the heart in crayfish
reproductive system in crayfish
gonads (testes or ovaries)
external anatomy of grasshopper
head, thorax, abdomen, antennae, six legs, in females: ovipositor, in males blunt tail
digestive system of grasshoppers
esophagus, pharynx, crop, stomach, gastric caecae, rectum, intestine, malphighian tubes, anus
gastric caecae in grasshoppers
digestive gland, produces enzymes to help digest food in the stomach
crop in grasshoppers
storage unit between the pharynx and stomach
reproductive system in grasshoppers
testes, follicles, vas defrens, ejaculatory duct with accessory glands (in males), ovaries, egg tubes which produce ova, oviduct, vagina, accessory glands, spermatheca
spermathica in grass hoppers
in the female, used to store sperm received at copulation