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| Distribution of the pill clam Pisidium langleyanum melvill & Ponsonby, 1891 (Bivalvia: Sphaeriidae) in South Africa | 100 |
| November 2012 | December 2012 | January 2013 | March 2013 | April 2013 | May 2013 | |
| Distribution of the pill clam Pisidium langleyanum melvill & Ponsonby, 1891 (Bivalvia: Sphaeriidae) in South Africa | 21 | 25 | 15 | 3 | 11 | 8 |
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