Known Specimens Reveal a Distinct White Band Along the Upper Jaw

This shark’s mouth appears outlined like a glowing crescent in darkness.

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Many deep-sea organisms use high-contrast markings to manipulate limited available light.

Documented megamouth specimens display a noticeable white band along the upper jaw. This feature may enhance visual contrast in dim waters and potentially assist in attracting plankton toward the mouth.

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In the deep ocean, even faint contrasts can function as visual lures. A pale band framing a cavernous mouth creates a striking silhouette against dark water.

Such anatomical detailing suggests evolutionary fine-tuning for feeding efficiency in low-light environments, where subtle optical cues may determine whether a drifting swarm enters or bypasses the shark’s open jaws.

Source

Florida Museum of Natural History

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