| The creature was a quadruped, two appendages connected to the upper chest cavity, in a very mammalian like structure. |
| Note that the male in the image at right has much larger eyes and raptorial appendages. |
| These differences in number of segments and function of appendages are used to distinguish between crustacean groups. |
| In many ammonites the terminal body chamber is relatively large, inflated, and with a constricted aperture or apertural appendages. |
| Their lethal raptorial appendages provide effective weapons for acquiring and defending these homes. |
| A nauplius consists of the first three cephalic segments and the appendages belonging to those segments, the antennules, antennae, and mandibles. |
