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
. A difference occurs in the length of setae on the exopod.
(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
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).