What kind of animal is Gonionemus?
jellyfish
Gonionemus, genus of small marine hydrozoans (order Limnomedusae, phylum Cnidaria). The conspicuous jellyfish stage of Gonionemus species is bell-shaped and measures about 15 mm (0.6 inch) or more in diameter.
What is the function of a velum in a Hydromedusae?
Hydromedusae are further distinguished from scyphomedusae by possession of a velum, a circumferential shelf of tissue that encircles the subumbrellar concavity and functions as an adjustable diaphragm to create a pulse of water for swimming.
What is a jellyfish Manubrium?
The portion of a jellyfish or other cnidarian that bears the mouth at its tip. The uppermost of the three bony segments constituting the breastbone in mammals.
What is the life cycle of a cnidarian?
Cnidarians all have a life cycle of two forms. One is a free-swimming jellyfish medusa stage and the second is an attached polyp stage. Cnidarians have a radially symmetrical body shape with a mouth surrounded by rings of tentacles.
Is Gonionemus polyp or Medusa?
The conspicuous stage in the dimorphic lifecycle is the small medusa. The polypoid stage is present as a tiny, solitary polyp which feeds on protozoans and other small plants and animals. The polyp stage closely resembles Hydra….
| Gonionemus | |
|---|---|
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Class: | Hydrozoa |
| Order: | Limnomedusae |
Where is Gonionemus found?
Gonionemus vertens is a marine and brackish species from shallow coastal waters of the north Pacific region, but there is considerable uncertainty about its exact native distribution. It certainly includes the northwest Pacific from the Russian Far East to Japan.
Do Hydromedusae have a velum?
Unlike the hydrozoan jellyfish, Hydromedusae, Scyphomedusae lack a vellum, which is a circular membrane beneath the umbrella that helps propel the (usually smaller) Hydromedusae through the water.
How do Hydromedusae differ from Scyphomedusae?
In general, hydromedusae are small, and either transparent or lightly pigmented, although some of the deep sea species are deeply colored – usually some version of dark red. (Scyphomedusae, in contrast, are usually large and often highly pigmented and are what most people think of when jellyfish are mentioned.)
What is a medusa in jellyfish?
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 medusa is a free-swimming form; it moves by rhythmic muscular contractions of the bell, providing a slow propulsive action against the water.
How do cnidarians live?
Ecology of Cnidarians They may live in water that is shallow or deep, warm or cold. Some cnidarians live alone, while others live in colonies. Corals form large colonies in shallow tropical water. They are confined to shallow water because they have a mutualistic relationship with algae that live inside them.
What is a Cnidaria known for?
Cnidaria (/nɪˈdɛəriə, naɪ-/) is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.
What kind of jellyfish is a Gonionemus?
Definition of Gonionemus. : a genus of small cosmopolitan hydrozoan jellyfishes (order Trachomedusae)
Where are most Gonionemus found in the world?
Most Gonionemusspecies are widely distributed in the warmer regions of the Atlantic and Indo-Pacific oceans. Several have been introduced in the waters off northwestern Europe with Portuguese oysters to which their polyps attach. This article was most recently revised and updated by John P. Rafferty, Editor.
How long does Gonionemus pain last in the body?
Numbness sets in, along with pain in the joints of the arms and legs; breathing becomes laboured and can temporarily cease. Liver malfunction sometimes occurs, and the acutesymptoms last four to five days. Most Gonionemusspecies are widely distributed in the warmer regions of the Atlantic and Indo-Pacific oceans.