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MONTESANTO ET AL.: DISTRIBUTION OF TYLOS IN THE MEDITERRANEAN 51

Fig. 2. Map of the geographical distribution within the Central Mediterranean surveyed within the current study of Tylos ponticus and Tylos europaeus;
numbers are given in Table 1.

Table 2. Granulometric data for a number of sandy beaches in Sicily, where Tylos spp. individuals was recorded in the present study. SD, standard deviation;
SE, standard error.

Beach Mean Max. Min. Mode Median SD SE Confidence interval (95%) No. of samples

Brucoli 1.108 7.247 0.525 1.008 0.976 0.738 0.061 0.989-1.200 150
Cornino 0.731 2.221 0.122 0.493 0.675 0.272 0.015 0.701-0.761 318
Filicudi 0.428 1.244 0.145 0.206 0.403 0.164 0.009 0.410-0.446 309
Fontane Bianche 0.484 1.315 0.025 0.333 0.471 0.163 0.012 0.462-0.500 200
Giampilieri 1.771 8.444 0.515 0.515 1.474 1.201 0.118 1.540-2.000 104
Isola delle Correnti 0.642 1.956 0.146 0.346 0.346 0.247 0.014 0.615-0.669 324
Marina di Modica 0.703 1.592 0.331 0.563 0.685 0.185 0.015 0.672-0.733 143
Marzamemi 0.908 2.219 0.453 0.744 0.862 0.264 0.022 0.866-0.900 150
Morghella 0.420 0.901 0.005 0.354 0.406 0.139 0.008 0.405-0.435 323
Paradise Bay 0.673 1.697 0.278 0.442 0.634 0.201 0.013 0.648-0.698 254
Playa di Catania 0.344 0.876 0.008 0.297 0.338 0.111 0.006 0.332-0.300 306
Punta delle Formiche 0.622 1.609 0.272 0.409 0.589 0.199 0.011 0.600-0.644 311
Ramla 0.384 0.754 0.214 0.2515 0.3645 0.010 0.009 0.367-0.400 273
Ronciglio 1.047 2.643 0.335 0.846 0.983 0.490 0.036 0.977-1.118 184
San Blas 0.422 0.8505 0.212 0.317 0.403 0.111 0.008 0.406-0.438 380
San Vito Lo Capo 0.476 1.258 0.034 0.274 0.454 0.16 0.009 0.459-0.492 351
Sindaro Marino 0.361 0.742 0.129 0.326 0.348 0.12 0.007 0.347-0.374 303
Torretta Granitola 1.007 2.652 0.417 1.277 0.921 0.365 0.024 0.961-1.054 237
Ustica 0.887 1.94 0.189 0.592 0.851 0.322 0.018 0.851-0.923 307