How We Know

Creature reference

Frilled shark

Chlamydoselachus anguineus · 50–1,570 m

Reference answer

A rare eel-shaped shark with six pairs of gill slits, three-pronged teeth, and flexible jaws.

Adaptations

  1. Elongated flexible body
  2. Inward-pointing trident teeth
  3. Wide-opening terminal jaws

Depth zones

Sunlight ZoneThe upper ocean where photosynthesis can occur and most familiar marine food webs begin.Twilight ZoneA dim global layer where enormous numbers of animals migrate upward at night and descend before dawn.Midnight ZoneThe largest continuously dark habitat, where food is scarce and animals rely on specialized senses, lures and low-energy strategies.

Evidence

Sources reviewed

  1. Frilled SharkSmithsonian Ocean · checked 2026-07-30