16 Legs flashcards |

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Ball joint

coxa

femur to ball joint

trochanter

thigh bone

femur

under knee

tibia

lower than tibia

tarsomere

multiple end joint

tarsus

pad between claws

arolium/pulvilli

Acquisiton of wings

independent of legs *rare

Entire leg movement

by muscle from tergum or sternum

Individual leg segments movement

by muscles within each leg segment

walking mechanism

move on tripod of legs at the same time

modified fore legs walking

move each leg at a time

Cusorial Legs

Running
basic type
elongate: more distance, less effort
slim: less environmental friction

Saltatorial

Jumping
located on metathorax
enlarged femur to accomadate larger muscle that extends tibia

Raptorial

grasping prey
located on prothorax
large depressor muscle pull tibia against femur

Natatorial

Swimming
middle and hind legs flattened for increased SA
row of setae on tarsus

Fossoiral

Digging
forelegs modified
projections to rake soil
tarsi reduced

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