| A nauplius consists of the first three cephalic segments and the appendages belonging to those segments, the antennules, antennae, and mandibles. |
| In decapods, or the larger crustacea, they are at the base of the antennules. |
| The lobster's head bears antennae, antennules, mandibles, the first and second maxillae, and the first, second, and third maxillipeds. |
| The presence of urine increases olfactory sampling through antennules flicking during fights. |
| The antennules are uniramous, the others biramous, and all three pairs are used in swimming. |
| The cerci appear to have been long, slender, very spinose organs much like the antennules, but stiff rather than flexible. |
