Second maxilla; mouthparts immediately posterior to maxillules sessile eyes - eyes set directly on the head [Brusca and Brusca, 2002].
The appendages of the 5th and 6th head segments are the first and second pairs of maxillae respectively (Fig. 3). Both pairs are included in the mouthparts and the 2nd maxillae bear the scaphognathites [Warner, 1977].
The third pair of mouthparts (or fifth pair of appendages) [Ingle, 1983].
Third pair of mouthparts (maxillae 2) [Holdich and Jones, 1983].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.