KEY TO THE SPECIES OF CRISTARMADILLIDIUM AND IBERIARMADILLIDIUM

1. Tegument not covered by strong tubercles ................................................................................................... 2

Tegument covered by strong tubercles .......................................................................................................... 3

2. Tegument smooth ......................................................................................... Cristarmadillidium alticola

3. Tegument with obsolete, but patent tubercles ............................................................................................... 4

4. Pereonite 1 epimera with schisma. Epimera vertical (without bell-shaped transverse body section). Pleopod 1 exopod with rounded apexes ........................................ Cristarmadillidium myrmecophilum

Pereonite 1 epimera without schisma. Epimera bent outwards (with bell-shaped transverse body section). Pleopod 1 exopod with pointed distal apex ................................................... Cristarmadillidium breuili

5. Pereonite 1 epimera without schisma ........................................................................................................... 6

Pereonite 1 epimera with schisma ......................................................................... 7 (Iberiarmadillidium)

6. Tubercles hypertrophied in cephalon, pereon, pleon and telson .......... Cristarmadillidium muricatum

Small tubercles on cephalon and pleon, larger and elongated in pereonites, absent in telson ..................... ............................................................................................................... Cristarmadillidium zaragozai

7. All tubercles on pleonite 5 equal in size. Tubercles on pereonites rounded, not elongated ........................... .......................................................................................................................... Iberiarmadillidium sakura

Middle pair of tubercles on pleonite 5 larger than outer two pairs. Tubercles on pereonites elongated ... 8

8. Tubercles on pereonites elongated but rounded, neither elevated in a keel-like shape nor with a squarish profile. Epimera lighter than dorsal parts .................................... Iberiarmadillidium psammophilum

Tubercles on pereonites elongated and elevated, keel-like and squarish in lateral profile, particularly in caudal rows. Uniform coloration ................................................................ Iberiarmadillidium pinicola