Abstract
Gas-liquid chromatographic studies were done to determine the fatty acid composition of total lipids, triacylglycerols, and phospholipids of two strains of Helisoma trivolvis snails maintained on a lettuce-tetramin diet, Linolenic (18:3), oleic (18:1), palmitic (16:0), and linoleic (18:2) accounted for about 50% of the Tetramin diet, Linolenic (18.3), oleic (18:1), palmitic (16.0), and linoleic (18:2) accounted for about 50% of the fatty acids in the total lipids of both the Colorado (CO) and Pennsylvania (PA) strains. In the Colorado strain, about 50% of the fatty acids in the triacylglycerol fraction consisted of linolenic (18:3), palmitic (16:0), and eicosodienoic (20:2) acids; in the Pennsylvania strain, linelenic (18:3), palmitic (16:2), and oleic (18:1) acids made up about 50% of this fraction. The following fatty acids comprised about 50% of the phospholipids in the Colorado strain: linolenic (18:3), lauric (12:0),linoleic (18:2), eicosodienoic (20:2) and palmitic (16:0); linolenic (18:3), lauric (12:0) myristic (14:0), stearic (18:0), and eocosodienoic (20:2) made up about the same percentage of the phospholipid fatty acids in the Pennsylvania strain. Significant differences, both qualitatively and quantitatively, were seen in some of the fatty acids identified in this study, supporting the contention that lipid profiles may be useful in the chemotaxonomy of related strains of snails.
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