Zoeae rapidly beat their
maxillipeds to swim and generate feeding currents (Foxon, 1934), and efficient locomotion relates to the size and cross-sectional area of
maxillipeds and attached setae (Chia et al., 1984).
politus has a third
maxilliped with a minute dactylus inserted subdistally on the ventral margin of propodus (Figs.
To detect this chemical, however, the robot had to draw the released chemical to its sensors with the help of the water currents generated with the
maxilliped arms.
First
maxilliped. A difference occurs in the length of setae on the exopod.
Second
Maxilliped (Figure 2e): Endopod 5-segmented, distal segment ending in 1 strong distal and 2 sub-distal spines, sub-distal segment rounded distally with long serrulate setae; exopod absent.
The stomodeum is also clearly visible, and there is an initial differentiation of the mandibules, maxillules, maxillae, and
maxilliped primordia.
Maxilliped base with 3 distal setae longer than endites.
Maxilla and first
maxilliped with dense covering of setae-like structure formed by bacterial colony on ventral surfaces of scaphognathite and caridean lobe, respectively (Fig.
alata Campos 1989, but can be distinguished from it by smooth upper margin of third
maxilliped merus, the size and shape of apex of first gonopod, and the internal lobe or papilla of spermatic channel, which is concave, raised, with ends with minute papillae or rounded tubercles.
ae: antennule; aa: antenna; ma: maxilla; md:
maxilliped; me: maxillule; os: oral sucker; ro: rostrum; (D) Adult male, dorsal view.
Other abbreviations used include: MZUCR: Museo de Zoologia, Universidad de Costa Rica; SDNH: San Diego Natural History, California, USA; CL: carapace length; CW: carapace wide; MXP3: third
maxilliped; P1: pereopod 1 (cheliped), P2-P5: pereopods 2-5 (walking legs 1-4).