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

Match each set of diagnostic morphological features in Column A with its corresponding higher invertebrate phylum in Column B.

  • True metameric segmentation, chitinous chaetae, closed circulatory system, and nephridiaPhylum Annelida
  • Soft unsegmented body with a mantle, muscular foot, and chitinous radulaPhylum Mollusca
  • Chitinous exoskeleton, jointed appendages, haemocoel, and Malpighian tubulesPhylum Arthropoda
  • Pentamerous radial symmetry in adults, mesodermal endoskeleton of ossicles, and a water vascular systemPhylum Echinodermata

Answer

True metameric segmentation with chaetae and nephridia matches Phylum Annelida; Soft unsegmented body with mantle and radula matches Phylum Mollusca; Chitinous exoskeleton with jointed appendages and Malpighian tubules matches Phylum Arthropoda; Pentamerous radial symmetry with endoskeletal ossicles and water vascular system matches Phylum Echinodermata.
Each higher invertebrate phylum is uniquely defined by core anatomical hallmarks: Annelida displays true metameric segmentation with chaetae and nephridia; Mollusca features an unsegmented body with a specialized mantle and radula; Arthropoda exhibits a chitinous exoskeleton with jointed appendages and Malpighian tubules; Echinodermata possesses an endoskeleton of calcareous ossicles and a hydraulic water vascular system.

Step-by-Step Solution

1
Analyze the anatomical features of true metameric segmentation, chaetae, closed circulation, and nephridia.
Matched with Phylum Annelida.
Annelids are distinguished from other worms and higher invertebrates by coelomic metamerism and nephridial tubule units.
2
Analyze the anatomical features of a soft unsegmented body, mantle, muscular foot, and radula.
Matched with Phylum Mollusca.
The mantle fold and chitinous feeding ribbon (radula) are unique diagnostic characters of molluscs.
3
Analyze the anatomical features of jointed limbs, chitinous exoskeleton, open haemocoel, and Malpighian tubules.
Matched with Phylum Arthropoda.
Arthropodization involves continuous ecdysis of a chitinous cuticle and articulation of jointed appendages.
4
Analyze the anatomical features of adult pentamerous radial symmetry, calcareous ossicles, and water vascular system.
Matched with Phylum Echinodermata.
Echinoderms uniquely utilize enterocoelous hydraulic tube feet driven by the water vascular system.

Key Concept

Diagnostic anatomical structures and coelomic organization of higher invertebrate phyla
Estimated Time:1m 30s
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Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

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