part of part of immediately preceded by immediately preceded by occurrent larval development phase early pluteus larva stage 4-arm pluteus larva stage P Plut Plut4a pluteus larva Pluteus The larva is characterized by the presence, on the ventral side, of four extended arms (two anterolateral arms at the level of the oral hood and two postoral arms) and on the dorsal side by a sleeked apex. The larva now possesses a completely tripartite and functional digestive tract composed of an esophagus, a stomach, and an intestine, respectively limited by a cardiac sphincter, a pyloric sphincter, and an anal sphincter. UBERON:0008265 ecao_developmental_stage