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Fig. 9 | Helgoland Marine Research

Fig. 9

From: In the Asia-Pacific region, the COI DNA test revealed the divergence of the bivalve mollusc Mactra chinensis into three species; can these species be distinguished using shell coloration and sperm structure?

Fig. 9

The bivalve mollusc Mactra chinensis. The diagrams show the proportions of sperm morphs that are characteristic for different geographic locations: Sea of Japan, Russia (A), Sea of Japan, South Korea (B), Yellow Sea, China (C). 1—SPERM1, which has an acrosome without an acrosomal protrusion. 2—SPERM2, which has an acrosome with an acrosomal protrusion of 0.4 μm long. 3—SPERM3, having an acrosome with an acrosomal protrusion of 0.6 μm long. 4—SPERM4 with acrosomes having a protrusion of 0.8 μm long. The results were analysed by the Microsoft Excel program. All values are expressed as means with standard error of the mean (SEM). Percentages were calculated using the Student’s t test and *P  <  0.05, **P  <  0.001 were considered statistically significant

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Helgoland Marine Research

ISSN: 1438-3888

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