Figure 6.—

Appearance of 3nRB, 4nRB, and 5nRB hybrids. (A) The 3nRB hybrid did not present any barbell on the mouth. Its ratio of body length to body width was 1.67, and its lateral scale number was 28–30. (B) The 4nRB hybrid had a pair of barbells on the mouth. Its ratio of body length to body width was 2.19, and its lateral scale number was 31–33. (C) The 5nRB hybrid did not possess any barbell on the mouth. Its ratio of body length to body width was 2.42, and its lateral scale number was 34–36. Bar in A–C, 1 cm.