Practice question
Question
Body of hemichordates is divided into
Explanation
Hemichordate organization illustrates tripartite coelomic body plan reflecting enterocoelous deuterostome development. Anterior protosome or proboscis contains protocoel and stomochord, functioning in burrowing, exploration and mucus-assisted feeding with independent proboscis pore for coelomic fluid. Middle mesosome or collar contains mesocoel, ventral mouth, dorsal hollow collar cord and neurocord. Posterior metasome or trunk is elongated containing metacoel, numerous paired U-shaped pharyngeal gill slits dorsolaterally, hepatic caeca and gonads. Proboscis-collar-trunk division contrasts with head-thorax-abdomen of arthropods and cephalothorax-abdomen of chelicerates, defining functional specialization for feeding taxonomy.
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