How many distinct ridges extend backward from the eyes on the C. destructor head?
Answer
Four
The cephalic region, or head, of *Cherax destructor* contains several precise morphological identifiers. One essential characteristic involves the upper surface of the head, where observers should specifically look for four distinct ridges. These ridges are positioned to extend backward, running from the area immediately behind the eyes towards the posterior section of the head. This count of four ridges is a fixed characteristic used by experts to confirm the species identity, independent of its highly variable body coloration.
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