What two features classify the yabby within the subphylum Crustacea?
Answer
Two pairs of antennae and body division into cephalothorax/abdomen
The subphylum Crustacea is defined by a set of key anatomical traits that separate these arthropods from insects and arachnids. The primary features used for this classification include having two pairs of antennae—one longer pair and one shorter pair—which are sensory organs used for navigating and sensing the environment. Furthermore, the body structure is typically divided into two major regions: the cephalothorax (a fused head and thorax) and the abdomen. While possession of an exoskeleton and being a Decapod (ten feet) are also true, the presence of two pairs of antennae and the specific tagmata division are crucial differentiators at the subphylum level.
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