Flashcards in Arthropoda Deck (9)
What is the group ecdysooa?
undergo ecdysis - the arthropods, nematodes and echinoderms
What are the key features?
hard exoskeleton, segmented bodies, jointed appendages , open circulatory system, well developed cephaliation
How old is oldest fossil?
What are the different groups?
Trilobites, Chelicerates, crustacea, myriapods, Hexapoda,
What are the trilobites?
All extinct, in the permian, lived in shallow seas
What are the chelicerates?
SPIDES, HORSE SHOE CRABS, TICKS, have claylike feeding appendages, lack antenna, have simple eyes, moat of group are arachnids - spiders, scorpions, ticks
cephalothorax with 6 pairs of appendages
What are the crustacea?
Lobsters and crabs, highly specialised appendages, have swimming larval stage, small exchange gas through shell, large have gills, secret calcium carbonate shell,
What are the myriapods?
Millipedes and centipedes, diploid are the millipedes, Chilopoda are the centipedes. highly segmented, kits of legs, have mandibles.