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Fig. 7. Cladogram for Sarda and the five tuna genera (abbreviations as
above) reflecting differences in the position and the relative quantity (as
illustrated in near mid-body transverse sections) of RM (deep red), and the
phyletic trend for greater emphasis on lateral vascular supply [arteries
(red), veins (blue)] and retia (red and blue lines) for RM. See text
for detail.