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Hydra vs Obelia - What's the difference?

hydra | obelia |

As nouns the difference between hydra and obelia

is that hydra is any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles while obelia is any of various colonial marine hydroids of the genus genus: Obelia.

As a proper noun Hydra

is a mythological serpent with seven heads, slain by Hercules as one of his twelve labours. Also called the Lernaean Hydra.

hydra

Noun

  • Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.
  • A complex, multifarious problem or situation that cannot be solved easily and rapidly.
  • * 2009 , Kris Frieswick, Till Death Do Us Pay :
  • Because the statute is so vaguely worded, award decisions are habitually based on case law, the growing mountain of which is a hydra of rulings that point in so many directions that almost any decision can be defended or overturned on appeal, depending on how smart your lawyer is and which precedent he selects to argue your case.

    obelia

    Noun

    (en noun)
  • (zoology) Any of various colonial marine hydroids of the genus .
  • * 1970 , Marie M. Jenkins, Animals Without Parents , page 55,
  • All the polyps and branches of obelias are supported and protected by a thin, transparent, horny covering which is made by the outer layer of cells. About each polyp the horny covering is in the shape of a goblet or cup.
  • * 1975 , , page 42,
  • Fragile but menacing, obelias''' are colonies ranging from one to eight inches in length which grow on seaweeds, rocks, and piles. The medusa, only one stage in the '''obelia’s life cycle, has anywhere from eight to 24 tentacles, .
  • * 1999 , Martin Walters, Jinny Johnson, The World of Animals , 2011, page 31,
  • .