What fin structure characteristic is explicitly attributed to true eels, unlike *A. ocellatus*?
Answer
Lack of pelvic fins entirely
A key structural characteristic used to distinguish true eels, classified under the Order Anguilliformes, from the wolf eel is the lack of pelvic fins. True eels lack pelvic fins entirely, whereas *A. ocellatus*, being classified under the Order Perciformes, possesses a body structure typical of bony fishes, contrasting sharply with the highly derived serpentine anatomy of true eels. While true eels also have continuous median fins, the absence of pelvic fins is a specific feature highlighted in the contrast between the two groups.
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