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medusae    
medusa的复数形

medusa的复数形

Medusa \Me*du"sa\, n. [L., fr. Gr. ?.]
1. (Class. Myth.) The Gorgon; or one of the Gorgons whose
hair was changed into serpents, after which all who looked
upon her were turned into stone.
[1913 Webster]

2. [pl. {Medusae}.] (Zool.) Any free swimming acaleph; a
jellyfish.
[1913 Webster]

Note: The larger medusae belong to the Discophora, and are
sometimes called {covered-eyed medusae}; others, known
as {naked-eyed medusae}, belong to the Hydroidea, and
are usually developed by budding from hydroids. See
{Discophora}, {Hydroidea}, and {Hydromedusa}.
[1913 Webster]

{Medusa bud} (Zool.), one of the buds of a hydroid, destined
to develop into a gonophore or medusa. See {Athecata}, and
{Gonotheca}.

{Medusa's head}.
(a) (Zool.) An astrophyton.
(b) (Astron.) A cluster of stars in the constellation
Perseus. It contains the bright star Algol.
[1913 Webster]


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  • Jellyfish - Wikipedia
    Jellyfish, also known as sea jellies or simply jellies, are the medusa -phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria Jellyfish are mainly free-swimming marine animals, although a few are anchored to the seabed by stalks rather than being motile
  • Medusa | Sea creature, Marine life, Tentacles | Britannica
    medusa, in zoology, one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria It is the typical form of the jellyfish The medusoid body is bell- or umbrella-shaped Hanging downward from the centre is a stalklike structure, the manubrium, bearing the mouth at its tip
  • Medusa Definition and Examples - Biology Online Dictionary
    noun, plural: medusae (zoology) The freely-swimming, umbrella- or disk-shaped gelatinous form of Cnidarians (as opposed to the polyp form) Supplement Cnidarians exhibit two body forms: the freely swimming medusa and the sessile polyp forms
  • The genome of the jellyfish Clytia hemisphaerica and the evolution of . . .
    Jellyfish (medusae) are gelatinous, pelagic, radially symmetric forms found only in Medusozoa They show complex physiology and behaviour as shown by neural integration of well-defined
  • Medusa: A Review of an Ancient Cnidarian Body Form - PubMed
    Medusae (aka jellyfish) have multiphasic life cycles and a propensity to adapt to, and proliferate in, a plethora of aquatic habitats, connecting them to a number of ecological and societal issues
  • Cnidarian - Polyp, Medusa, Tentacles | Britannica
    Cnidarian - Polyp, Medusa, Tentacles: Cnidarians have two cell layers, ectoderm and endoderm (gastrodermis), with the mesoglea between them Medusae have a more highly developed nerve net than do polyps Respiration and excretion are carried out by individual cells
  • Coevolution of the Tlx homeobox gene with medusa development . . . - Nature
    Among the main cnidarian clades, only Medusozoa possesses a swimming life cycle stage called the medusa, alternating with a benthic polyp stage The medusa stage was repeatedly lost during
  • Medusozoa - Wikipedia
    Medusozoa is a clade in the phylum Cnidaria, and is often considered a subphylum [2][3] It includes the classes Hydrozoa, Scyphozoa, Staurozoa and Cubozoa, and possibly the parasitic Polypodiozoa
  • Medusa (biology) - Simple English Wikipedia, the free encyclopedia
    In biology, a medusa (plural: medusae) is a form of cnidarian in which the body is shaped like an umbrella The other main body-form is the polyp Medusae vary from bell-shaped to the shape of a thin disk, scarcely convex above and only slightly concave below
  • Medusa - Wikipedia
    In Greek mythology, Medusa ( mɪˈdjuːzə, - sə ; Ancient Greek: Μέδουσα, romanized: Médousa, lit 'guardian, protectress'), [a] also called Gorgo (Ancient Greek: Γοργώ) [b] or the Gorgon, was one of the three Gorgons
  • Cnidaria - jelly fish, polyps and medusae - bumblebee
    Medusae have an umbrella-shaped body with the mouth in the centre of the concave undersurface The most interesting characteristic of the Cnidaria is the nematocyst (see the drawings above and below) They are located in special cells called cnidocytes
  • Medusa (zoology) - Encyclopedia. com
    Medusae are umbrella-shaped, with tentacles round the edge and the mouth in the centre underneath They swim by pulsations of the body and reproduce sexually In the Hydrozoa (e g Hydra) they alternate in the life cycle with polyps, from which they are produced by budding
  • Medusa: A Review of an Ancient Cnidarian Body Form
    Medusae (aka jellyfish) have multiphasic life cycles and a propensity to adapt to, and proliferate in, a plethora of aquatic habitats, connecting them to a number of ecological and societal issues
  • The state of Medusozoa genomics: current evidence and future challenges
    Medusozoa is a widely distributed ancient lineage that harbors one-third of Cnidaria diversity divided into 4 classes This clade is characterized by the succession of stages and modes of reproduction during metagenic lifecycles, and includes some of the most plastic body plans and life cycles among animals
  • Cnidarians and Ctenophores - UW Departments Web Server
    The medusae feed using tentacles to bring prey to the mouth The tentacles contain nematocysts, or cells that sting the prey and are also used for protection Medusae swim via jet propulsion (pulsing of the bell)





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