Mouthpart Morphology of Three Sympatric Native and Nonnative Gammaridean Species: Gammarus pulex, G. fossarum, and Echinogammarus berilloni (Crustacea: Amphipoda)

Figure 12

SEM images of maxillulae of Gammarus fossarum: (a) maxillulae in situ in posterior view; (b) left maxillula in anterior view; (c) inner plates of maxillulae in situ in posterior view; (d) median setation of inner plate of left maxillula in posterior view; (e) distal setation of outer plate of left maxillula in posterior view; (f) distal setation of outer plate of right maxillula in posterior view. Arrows indicate signs of abrasion.