What is the meaning of Sea_dragon?

Various sea animals that are said to resemble dragons:

  1. Certain fish:
    1. leafy sea dragon (Phycodurus eques)
    2. weedy sea dragon (Phyllopteryx taeniolatus)
    3. ruby sea dragon (Phyllopteryx dewysea)
  2. A blue sea dragon, a sea slug of species Glaucus atlanticus.

Certain fish:

  1. leafy sea dragon (Phycodurus eques)
  2. weedy sea dragon (Phyllopteryx taeniolatus)
  3. ruby sea dragon (Phyllopteryx dewysea)

leafy sea dragon (Phycodurus eques)

weedy sea dragon (Phyllopteryx taeniolatus)

ruby sea dragon (Phyllopteryx dewysea)

A blue sea dragon, a sea slug of species Glaucus atlanticus.

An ichthyosaur (Age of Dinosaurs delphine marine reptile)

Source: wiktionary.org