A student discovered a strange animal under a rock and brought it home. The animal had moist skin, a complete digestive system, a ventral nerve cord, and a metameric body. To which phylum does this animal belong?
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• The student must have brought an animal of phylum Annelida, i.e., earthworm which is commonly found in moist soil under the rocks.
• Metameric (segmented) body, ventral nerve cord, complete digestive tract and moist skin are the hallmarks of annelids (earthworms, leeches).
• Porifera: no true tissues/organs; no digestive tract or nerve cord.
• Mollusca: generally unsegmented body; often have a mantle and shell.
• Echinodermata: radial (often pentamerous) symmetry, water vascular system, no ventral nerve cord; mostly marine, not under rocks on land.
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