Figure 5.

Measured features of Daphnia morphology. A is the most anterior point of circular compartment around the compound eye. B is the point of tail spine attachment to the carapace. C is the tip of the rostrum. D is the tip of the head crest. Body length (BL) is the length between A and B. Head length (HL) is the length between A and the intersection of line AB and the perpendicular line extending from C to line AB. Crest length (CL1ob) is the length between A and the intersection of line AB and the perpendicular line from D to line AB. Crest position (CL2 ob) is the length between D and the intersection of line AB and the perpendicular line extending from D to line AB. Relative crest length and position (CL1 and CL2) were computed using the following equations to eliminate the effect of body length: CL1 = ln(CL1 ob/HL + 1), CL2 = ln(CL2 ob/HL + 1)

Ishida et al. BMC Evolutionary Biology 2011 11:209   doi:10.1186/1471-2148-11-209
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