What is the diagnostic feature of the Cherax destructor rostrum?
Answer
It is smooth
The rostrum, which is the projection of the carapace situated between the eyes on the head region of the common yabby, is a key diagnostic identifier. Specifically, it is described as being smooth. This absence of spines, pronounced raised edges, or extended keels is crucial for differentiation, particularly when compared to similar species such as the Australian Red Claw crayfish (*Cherax quadricarinatus*), which tends to have keels extending from its four head ridges. The smooth nature of this forward-pointing projection provides a reliable visual marker for identifying *C. destructor* in the field.
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