The antenna (sometimes called the second antenae) have a 2-segmented protopod (coxa and basis) and are biramous with an exopod and an endopod.
The mandibles also have a 2-segmented protopod and are biramous. The endopod is tipically 1-segmented rarely 2-segmented) and the exopod has a maximum of 4 segments. Reduction in obth rami, but usually the exopod, can result in a uniramous, 1-segmented mandibular palp.
The maxillules have a praecoxa with several spines and setae around its distal margin and usually with two setae on the anterior surface (absent in some reduced forms).
The maxillae are uniramous (the exopod absent). The endopod is at most 4- segmented.
The maxillipeds vary considerably throughout the order.
The mandibles also have a 2-segmented protopod and are biramous. The endopod is tipically 1-segmented rarely 2-segmented) and the exopod has a maximum of 4 segments. Reduction in obth rami, but usually the exopod, can result in a uniramous, 1-segmented mandibular palp.
The maxillules have a praecoxa with several spines and setae around its distal margin and usually with two setae on the anterior surface (absent in some reduced forms).
The maxillae are uniramous (the exopod absent). The endopod is at most 4- segmented.
The maxillipeds vary considerably throughout the order.
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