| Families/Species | N. | De. | D. | Length(mm) | |||||
| 1 | 2 | 3 | Org./m2 | Min. | Max. | Ave. | Sd. | ||
| LOTTIIDAE Gray, 1840 | |||||||||
| Lottia mesoleuca (Menke, 1851) | 2 | 34 | 20 | 1.12 | W | 4.52 | 23 | 10.09 | 3.79 |
| Lottia mitella (Menke, 1847) | 20 | 43 | 213 | 5.52 | W | 4.8 | 19.7 | 8.48 | 2.99 |
| Lottia acutapex (Berry, 1960) | 423 | 8.46 | I | 3.48 | 17.1 | 9.98 | 2.32 | ||
| Lottia discors (Philippi, 1849) | 480 | 26 | 168 | 13.48 | W | 5.67 | 43.3 | 21.01 | 8.7 |
| Lottia pediculus (Philippi, 1846) | 70 | 1 | 1.42 | R | 5.76 | 21.2 | 12.13 | 3.51 | |
| Tectura fascicularis (Menke, 1851) | 10 | 7 | 0.034 | R | 5.05 | 27.2 | 15.86 | 6.71 | |
| FISSURELLIDAE Fleming, CA, 1822 | |||||||||
| Fissurella rubropicta Pilsbry, 1890 | 3 | 0.06 | I | 12.6 | 18.3 | 15.34 | 2.85 | ||
| Fissurella (Cremides) microtrema Sowerby, 1835 | 1 | 0.02 | I | 15.3 | 15.3 | 15.26 | - | ||
| Fissurella nigrocincta Carpenter, 1856 | 273 | 5.46 | I | 5.54 | 21 | 11.97 | 3.03 | ||
| Fissurella gemmata Menke, 1847 | 27 | 31 | 48 | 2.12 | W | 8.22 | 36.4 | 18.36 | 6.36 |
| Fissurella longifissa Sowerby, 1866 | 1 | 0.02 | I | 24.8 | 24.8 | 24.81 | |||
| Fissurella morrisoni McLean, 1970 | 7 | 0.14 | I | 10.1 | 20.4 | 13.66 | 3.36 | ||
| Fissurella spongiosa Carpenter, 1857 | 1 | 0.02 | I | 8.69 | 8.69 | 8.69 | |||
| Fissurella asperella Sowerby, 1835 | 21 | 25 | 0.42 | R | 8.13 | 28.9 | 17.36 | 4.37 | |
| Fissurella obscura Sowerby, 1835 | 2 | 0.04 | I | 14 | 18.1 | 16.07 | 2.91 | ||
| TROCHIDAE Rafinesque, 1815 | |||||||||
| Tegula globulus (Carpenter, 1857) | 35 | 0.7 | I | 4.14 | 29 | 9.08 | 3.91 | ||
| NERITIDAE | |||||||||
| Nerita scarbricosta Lamark, 1822 | 3 | 0.06 | I | 8.51 | 12.3 | 10.12 | 1.96 | ||
| LITTORINIDAE Children, 1834 | |||||||||
| Nodilittorina aspera (Philippi, 1846) | 60 | 231 | 5.82 | R | 1.56 | 12.1 | 4.03 | 1.34 | |
| Nodilittorina modesta (Philippi, 1846) | 322 | 6.44 | I | 1.13 | 13.7 | 4.45 | 1.75 | ||
| RISSOIDAE | |||||||||