Various tissue lipids from the marine bivalves,
Megangulus venulosus (
M. venulosus) and
Megangulus zyonoensis (
M. zyonoensis), were analyzed for comparison of major fatty acids and their distribution. The main fatty acid components in this genus in all tissues were found to be 16:0 (11.0-15.2%), 18:0 (4.1-8.6%), 20:5n-3 (13.3-25.6%) and 22:6n-3 (8.1-16.7%), with n-3 polyunsaturated fatty acids most abundant. The proportion of 20:5n-3 was higher in
M. zyonoensis than in
M. venulosus, and 22:6n-3 was higher in
M. venulosus than in
M. zyonoensis. The proportions of 20:5n-3 and 22:6n-3 were highest in muscle tissue lipids from
M. venulosus and
M. zyonoensis, at 33.1% and 36.2%, respectively. The distribution of major fatty acid components in neutral (NL) and polar lipids (PL) was determined, with 16:0 and 20:5n-3 shown for NL, and 16:0, 20:5n-3 and 22:6n-3 for PL. The proportion of 22:6n-3 in NL and PL differed significantly, 22:6n-3 being much higher in PL. The main branched fatty acid component, 4,8,12-trimethyltridecanoic acid, was found mainly in PL of viscera tissues from either species. In addition, 2-hydroxypentadecanoic, 2-hydroxyhexadecanoic and 2-hydroxyheptadecanoic acids were also found to be present in the two species and this presence of 2-hydroxy fatty acids in the genus
Megangulus is reported here for the first time.
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