An active marine predator is found possessing these characteristics: a series of tentacles (modified from the foot), a highly developed nervous system, and elaborate eyes. To which of the following clades does this organism most likely belong?

• A. Chelicerata
• B. Polyplacophora
• C. Errantia
• D. Bivalvia
• E. Cephalopoda

Answer: (E)

Verified step by step guidance

1. Begin by identifying the key characteristics of the organism: tentacles, a highly developed nervous system, and elaborate eyes.
2. Recognize that tentacles modified from the foot are a distinctive feature of certain mollusks, particularly those in the class Cephalopoda.
3. Understand that a highly developed nervous system and elaborate eyes are indicative of advanced sensory capabilities, which are characteristic of cephalopods like squids and octopuses.
4. Consider the clades listed: Chelicerata, Polyplacophora, Errantia, Bivalvia, and Cephalopoda. Note that Chelicerata includes arachnids and horseshoe crabs, Polyplacophora includes chitons, Errantia includes certain annelid worms, and Bivalvia includes clams and oysters, none of which possess the combination of features described.
5. Conclude that the organism most likely belongs to the clade Cephalopoda, as it matches the described characteristics of tentacles, advanced nervous system, and complex eyes.