The radically different morphologies of the endopodite and coxal and basal endites facilitate the plasticity of functions that this appendage is capable of performing.
Each maxilla [ILLUSTRATION FOR FIGURE 4D OMITTED] of the first zoeal stage consists of a large scaphognathite (exopodite fused with epipodite) on the lateral portion of the appendage, a weakly bilobed endopodite and two bilobed endites on the mesial portion.
Prey manipulation and ingestion were apparently unaffected by movements of the exopodites and endopodites of the maxillipeds, which were used only for locomotion.
Table I Numbers of somata counted in the ganglion following dye infusion at the distal end of the basis in animals of different stages(*) Post larva Stage I Stage II Stage III and adult Exopodite 5, 5 6, 5 5, 6, 5 Endopodite 13, 13, 14 15, 12 12, 13, 13, 12, 13, 13, 14, 15 13, 14 * These numbers demonstrate that something approaching the full complement of motor neurons is present at hatching, but they cannot be considered definitive until silver intensification and antibody staining has been completed.
Similarly, infusion of intracellular dye into the end of the main endopodite nerve, as it passes distally out of the basis, revealed 12-15 motor neurons in all four stages, as well as in the adult animal (n = 15; see Table I).
The exopodites of the thoracic limbs are lost, and locomotion is provided by the endopodites - which become the pereiopods, or walking legs - and by the biramous pleopods of the abdomen.
bourdonis in that the frontal lamina of its head is not demarcated, its body is more rounded, it has dorsally visible coxal plates on more pereomeres, its pleopodal endopodites are larger than its exopodites, and its uropods touch each other medially.
The pleopods are similar to those of the type, their exopodites extending considerably beyond the margins of the pleomeres, the subcircular endopodites not covering the central region of the dorsal surface of the pleon.