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50 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 34, NO. 1, 2014

Fig. 1. Diagnostic morphological characters of Tylos ponticus (from Filicudi beach, Aeolian islands) and Tylos europaeus (from Fontane Bianche beach,
Sicily). A, C, T. ponticus; B, D, T. europaeus: lateral margin of pereionite 1 (white arrows). A, T. ponticus; B, T. europaeus: epimera of pereionites 2-7. E,
T. ponticus; F, T. europaeus: apex of pleopod 2 endopod. G, T. ponticus; H, T. europaeus: pleon and uropods, ventral vision. I, T. ponticus; J, T. europaeus:
process in basis of pereiopod 1 (white arrows). Scale bars: A, 10 mm; B, 10 mm; E, 100 μm; F, 100 μm.

P = 0.0828) between these, indicating that the distribu- of expected median grain sizes (hypothetical means), non-
tion of the two species cannot be attributed solely to differ- significant differences under 0.500 mm for T. ponticus and
ences in sediment grain-size. Despite this, it is worth ob- under 0.300 mm for T. europaeus emerged. The differences
serving that, through the testing of the median values of are significant above 0.600 mm for T. ponticus and above
grain-size for each species, by choosing different thresholds 0.350 mm for T. europaeus, possibly indicating an upper