Key to the species of the genus Porcellionides Miers, 1877 from the Ibero-Balearic region

1. Pereon with transverse ridges on the dorsal side of the tergites ....................................................... 2

– Pereon without transverse ridges on the dorsal side of the tergites .................................................. 5

2. Carpus of the pereopod 1 in males lacks a brush of setae ................................................................ 3

– Carpus of the pereopod 1 in males with a brush of setae ................................................................. 4

3. Highly convex body, smooth integument, male exopod of the pleopod I with an inner lobe ending in a curved tip ..................................................................................................... P. glaber (Koch, 1856)

– Elongated body, integument with fine granulations, male exopod of the pleopod I with a long posterior inner tip ...................................................................... P. sexfasciatus (Budde-Lund, 1885)

4. Integument with weak and flat granulations, cephalon with very small lateral lobes, male exopod of the pleopod I and II with notches ....................................................... P. cingendus (Kinahan, 1857)

– Integument with marked granulations, cephalon with moderate lateral lobes, male exopod of the pleopod I and II without notches ......................................................... P. lucasioides (Vandel, 1953)

5. Carpus of the pereopod 1 in males lacks a brush of setae ................................................................ 6

– Carpus of the pereopod 1 in males with a brush of setae ................................................................. 7

6. Cephalon with moderate lateral lobes, male exopod of the pleopod I with a truncated posterior inner tip .......................................................................................................................... P. ibericus sp. nov.

– Cephalon without lateral lobes, male exopod of the pleopod I without a posterior inner tip ............. .................................................................................................................. P. hispanus (Vandel, 1953)

7. Smooth integument, cephalon with almost absent lateral lobes ......................................................... .......................................................................................... P. fuscomarmoratus (Budde-Lund, 1885)

– Integument with more or less pronounced granulations, cephalon with more or less marked lateral lobes .................................................................................................................................................. 8

8. First and second segments of the antennal flagellum of equal or very similar size .......................... 9

– First segment of the antennal flagellum much longer than the second ........................................... 10

9. Male exopod of the pleopod I with a deeply incised posterior inner tip and an unnotched tracheal field .................................................................................................... P. elegans (Pollo Zorita, 1982)

– Male exopod of the pleopod I with a very small posterior inner tip and a notched tracheal field ...... .................................................................................................................. P. molleri (Verhoeff, 1901)

10. Integument with small and flat granulations, cephalon with small lateral lobes ................................ ................................................................................................................ P. pruinosus (Brandt, 1833)

– Integument with strong granulations, cephalon with moderate lateral lobes ..................................... ................................................................................................................. P. lusitanus (Vandel, 1946)

This key is only applicable to males and does not include P. buddelundi (Verhoeff, 1901) or P. rufocinctus (Dollfus, 1892), which we regard as species inquirendae, based on currently available data.