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Difficulty: Very hardHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

An investigation of excretory organs, respiratory structures, and circulatory configurations across four coelomate invertebrate groups yields the following observations:

- Group 1: Metameric segmentation, metanephridia for excretion, moist cutaneous body surface for gas exchange, and a closed circulatory system.
- Group 2: Tagmatization with a chitinous exoskeleton, Malpighian tubules for excretion, a tracheal tubular system for gas exchange, and an open circulatory system.
- Group 3: Unsegmented soft body covered by a mantle, organs of Bojanus (metanephridia) for excretion, ctenidia for gas exchange, and an open circulatory system.
- Group 4: Secondary pentamerous radial symmetry, dermal branchiae and tube feet functioning in gaseous exchange/waste diffusion, and a water vascular system.

Which of the following correctly identifies Groups 1, 2, 3, and 4 in sequential order?

  1. Group 1: Annelida; Group 2: Arthropoda; Group 3: Mollusca; Group 4: EchinodermataAnswer
  2. B
    Group 1: Annelida; Group 2: Mollusca; Group 3: Arthropoda; Group 4: Echinodermata
  3. C
    Group 1: Echinodermata; Group 2: Arthropoda; Group 3: Annelida; Group 4: Mollusca
  4. D
    Group 1: Mollusca; Group 2: Annelida; Group 3: Arthropoda; Group 4: Echinodermata

Answer

Group 1 corresponds to Annelida, Group 2 to Arthropoda, Group 3 to Mollusca, and Group 4 to Echinodermata.
The correct response accurately maps all four diagnostic feature sets: Group 1 exhibits annelid traits (metamerism, metanephridia, closed circulation); Group 2 features arthropod traits (chitinous exoskeleton, Malpighian tubules, tracheae); Group 3 displays molluscan features (mantle, ctenidia, organs of Bojanus); and Group 4 represents echinoderm features (water vascular system, tube feet, pentamerous symmetry).

Step-by-Step Solution

1
Analyze Group 1 diagnostic characteristics
Metameric segmentation, metanephridia, cutaneous respiration, and a closed circulatory system are diagnostic of phylum Annelida (e.g., earthworms).
Annelids feature true body metamerism and closed blood vessel systems.
2
Analyze Group 2 diagnostic characteristics
Tagmatization (head, thorax, abdomen), chitinous exoskeleton, Malpighian tubules, and tracheal network define phylum Arthropoda (specifically terrestrial insects).
Malpighian tubules filter uric acid into the gut, an adaptation unique to terrestrial arthropods.
3
Analyze Group 3 diagnostic characteristics
Soft unsegmented body with a mantle, ctenidia (gills), and organs of Bojanus characterize phylum Mollusca.
The mantle cavity housing ctenidia and specialized excretory nephridia (organs of Bojanus) are exclusive to molluscan anatomy.
4
Analyze Group 4 diagnostic characteristics
Secondary pentamerous radial symmetry, dermal branchiae (papulae), and a water vascular system belong to phylum Echinodermata.
Echinoderms lack specialized excretory organs, relying on tube feet and dermal branchiae for diffusion.

Key Concept

Diagnostic anatomical and physiological features distinguishing higher invertebrate phyla (Annelida, Arthropoda, Mollusca, Echinodermata)
Estimated Time:1m 30s
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Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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