Arthropoda

Question 1

What is the group ecdysooa?

Answer 1

undergo ecdysis - the arthropods, nematodes and echinoderms

Question 2

What are the key features?

Answer 2

hard exoskeleton, segmented bodies, jointed appendages , open circulatory system, well developed cephaliation

Question 3

How old is oldest fossil?

Answer 3

535my

Question 4

What are the different groups?

Answer 4

Trilobites, Chelicerates, crustacea, myriapods, Hexapoda,

Question 5

What are the trilobites?

Answer 5

All extinct, in the permian, lived in shallow seas

Question 6

What are the chelicerates?

Answer 6

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

Question 7

What are the crustacea?

Answer 7

Lobsters and crabs, highly specialised appendages, have swimming larval stage, small exchange gas through shell, large have gills, secret calcium carbonate shell,

Question 8

What are the myriapods?

Answer 8

Millipedes and centipedes, diploid are the millipedes, Chilopoda are the centipedes. highly segmented, kits of legs, have mandibles.

Question 9

What are the Hexapoda?

Answer 9

Class is insects, more specie Tham any other, live in terrestrial and freshwater, flight is key to success, wings are extensions of the cuticle, jointed skeleton, small body, well developed tracheal system