Fig. 4From: 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?Mustard (1–4) and brownish (5–8) shell colors found in samples of the bivalve mollusc Mactra chinensis belonging to the same genetic clade (clade COI III); collection of Dr. J. Zhang. 1–4 correspond to samples collected in the Yellow Sea near Yantai (ABCBF460-19, ABCBF461-19, ABCBF462-19, ABCBF463-19) (Table 1, green, column—‘present study; Fig. 2, green and bold), and 5–8 correspond to samples collected in the Yellow Sea near Weihai (MT791493, MT791494, MT791495, MT791496) (Table 1, green, column—‘present study’; Fig. 2, green and bold). Scale bar = 1 smBack to article page