Arthropods and Trilobites W5L2

Question 1

Arthropods german

Answer 1

Gliederfüßler

Question 2

Arthropods characteristics

Answer 2

bilateral symmetry
bodies made up of similar repeated segments
these are sometimes fused to form heads/ tails etc
(paired), jointed appendages
Arthro - pod = jointed foot
modified to form antennae, mouthparts, etc.
single brached (uniramous) and double branched (biramous)
external skeleton (exoskeleton)
this is what is found in fossils
but restricts growth
can only expand and shed
makes you vulnerable
versatility, diffeerent limbs diffeerent dunctions

Question 3

Arthropods made out of

Answer 3

made out of chitin (polysaccharfide), sometimes calcite

chitin doesnt preserve very weell, organic material which breaks down

Question 4

Trilobites

Answer 4

forst fossil we drew

Question 5

Cephalon

Answer 5

head, single plate of fused segments

Question 6

Pygidium

Answer 6

tail, fused segments

Question 7

Three lobes

Answer 7

hence tri lob ite

Question 8

Appendages

Answer 8

single-branched antennae

– all others paired (biramous) - one branch a jointed walking limb, the other a gill

Question 9

Trilobites otherfeatures

Answer 9

can enroll → protection
Tribolite eyes vary but present! some don’t have eyes at all
Trilobite moulting
shede skeletons, this helps to trace growth patterns

Question 10

Trilobite ecology

Answer 10

can help undeerstand function of shape body
benthic mode of life
– flattened body shape
– dorsal armour
– dorsal pointing eyes
– ventral appendages
• diversification of body shapes and distribution
of fossils suggests adaptation to live in a variety
of habitats

Question 11

Trace fossils create

Answer 11

Cruziana
moving trace or trial
Rusophycus is where they have a “rest”

Question 12

Planktonic Agnostida

Answer 12

blind, small tail large head
planktonic
because find them in black shales
weird morphology and geological distribution: planktonic