Figure 8. Numbers of polycystine species reported in various surveys which presumably attempted to identify all members of this group in their samples (some figures are approximate). a: Benson 1966 (surface sediments from the Gulf of California); b: Renz 1976 (0-100 m plankton and surface sediments, selected satations); c: Boltovskoy and Riedel 1980 (0-1500 m plankton); d: Boltovskoy 1987 (surface sediments); e: Boltovskoy and Riedel 1987 (0-100 m plankton); f: Swanberg and Eide 1992 (0-400 m plankton); g: Boltovskoy et al. 1993a (sediment trap samples from 853 m); h: Boltovskoy et al. 1996 (sediment trap samples from 2195 m); i: Boltovskoy et al. 1995 (0-300 m plankton); j: Kling and Boltovskoy 1995 (0-2000 m plankton, selected samples); k: Paverd 1995 (5 m plankton); l: Welling 1990 (1000-1500 m sediment traps and surface sediments); m: Takahashi 1981 (400-5500 m sediment traps); n: Abelmann 1992 (300-2500 m sediment traps); o: Bjørklund 1973, and Swanberg and Bjørklund 1987 (0-1000 m fjord plankton samples and surface sediments); p: Abelmann and Gowing 1997 (0-1000 m vertically stratified plankton samples from 7 stations).