Hog lice-insect or Arachnida? How to differentiate?

Question 1

insect or arachnida

Answer 1

insect-LOUSE

Question 2

largest

Answer 2

lice living in Estonia, 4-5 mm

Question 3

in latin

Answer 3

Haematospinus suis

Question 4

differentiate

Answer 4

-louse/lice 6 legs, 3 body segments, one pair of antennae,
-arachnids (spiders,) ticks 8 legs, 2 main body segments, never have wings, absence of antennae

> to diagnose under microscope