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Difficulty: MediumHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

Match each phylum of higher invertebrates on the left with its characteristic anatomical or diagnostic feature on the right.

  • AnnelidaMetanephridia opening into the coelomic cavity for waste excretion
  • MolluscaChitinous rasping radula used for feeding
  • ArthropodaMalpighian tubules suspended in hemolymph for excretion
  • EchinodermataHydraulic tube feet driven by a water vascular system

Answer

Annelida matches metanephridia; Mollusca matches radula; Arthropoda matches Malpighian tubules; Echinodermata matches tube feet driven by a water vascular system.
Each phylum is accurately paired with its definitive anatomical feature: Annelida with metanephridia, Mollusca with the rasping radula, Arthropoda with Malpighian tubules, and Echinodermata with tube feet of the water vascular system.

Step-by-Step Solution

1
Identify the diagnostic excretory and anatomical structures for Annelida and Mollusca.
Annelids feature metanephridia filtering coelomic fluid, whereas molluscs characteristically possess a specialized rasping radula for feeding.
Metanephridia and radulae serve as key evolutionary diagnostic structures for annelids and molluscs, respectively.
2
Identify the primary excretory organs for Arthropoda and the locomotory system for Echinodermata.
Arthropods use Malpighian tubules attached to the gut, while echinoderms uniquely utilize a hydraulic water vascular system operating tube feet.
These organ systems reflect major adaptations distinguishing arthropods and echinoderms from other invertebrate lineages.

Key Concept

Diagnostic anatomical structures and organ systems distinguishing major higher invertebrate phyla (Annelida, Mollusca, Arthropoda, and Echinodermata).
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Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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