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Cnidaria - Wikipedia, the free encyclopedia


Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic ... Several free-swimming species of Cubozoa and Scyphozoa possess .... and Scyphozoa (jellyfish), the mes...

Jellyfish and Comb Jellies | Smithsonian Ocean Portal


Chrysaora melanaster, one of the largest jellyfish commonly found in the Arctic, ... Between these layers is a gelatinous material called mesoglea, which makes up most ... Many microscopic organisms, such as bacteria, also use cilia to swim— but .... are genetically identical because they all come from a single fertilized egg.

Hydroids and Jellyfish - Academics

academics.smcvt.edu/dfacey/AquaticBiology/Coastal Pages/Jellyfish.html

Hydroids can consist of solitary organisms but are more commonly found as colonies ... These oral arms contain stinging cells called cnidocysts (MASLA). ... Larger jellyfish may be predators of fish or free-swimming invertebrates ... The sperm reaches the eggs located inside the female medusa and fertilization takes place.


spo.nmfs.noaa.gov/Fishery Leaflets/leaflet535.pdf

Jellyfishes or, as they are often called,. "sea nettles" .... species of medusae also have been found in fresh or very ... to any free- swimming jellyfish type of ... The fertilized egg undergoes gradual development into a ciliated larva. The larva ...

Moon Jelly - Aurelia aurita - Details - Encyclopedia of Life


Tiny hair-like structures called 'cilia' on the body of the jellyfish produce currents by beating. ... are taken into the female via the mouth and fertilization occurs internally. ... the eggs until they develop into free-swimming larvae (planula larvae). .... Typically found close to the coast, this jellyfish can also be found ...

Early Life History of the 'Irukandji'Jellyfish Carukia barnesi


Mar 8, 2016 ... Post fertilization, most eggs developed to an encapsulated planula stage ... budding producing ciliated swimming polyps, which in turn settled and ... Carukia barnesi free swimming planula larvae were first observed six ..... also very similar to the monodisc strobilation recently discovered in M. virulenta [15].

Chapter 39 Extended Lecture Outline - McGraw Hill Higher Education


... more successful than the others Porifera = sponges Cnidaria = jelly fish + hydroids + ... needles called spicules May possess fibrous spongin protein network The ... fertilized eggs Develops into a free swimming, multicellular, ciliated planula ... opening Cannot feed continuously Gut also functions to transport food Partial ....

jellyfish care manual - Association of Zoos & Aquariums


Jan 28, 2003 ... Sommer at Monterey Bay Aquarium found this species also had a .... which the fertilized egg develops directly into another medusa, either ... of an often highly maneuverable structure called a manubrium, which ... Ephyra: Small, first stage, free-swimming jelly destined to grow up to mature and become the.

The Oceans Their Physics, Chemistry, and General Biology


Such areas may be called areas of reproduction, or nursery areas. ... The large numbers of eggs and larvae produced are, instead, a measure of the .... The union of germ cells results in a free-swimming, ciliated, planula larva ... Vaughan (1919) found the pelagic period of corals to be from one day to two or three weeks.

Jellyfish - The soft sting - Guido Picchetti


Apr 17, 2009 ... jellyfish are feared as dangerous beauties of the deep. ... Jellyfish are coelenterates, species that also include the flowerlike ... Among Scyphozoa jellyfish, the sex organs are found only in the free-swimming medusoid (bell- shaped) stage, ... Fertilized eggs then grow into ciliated larvae that settle on the sea ...

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Cnidarians and Ctenophores


Hydrozoa are a class of jellyfish in the Phylum Cnidaria. ... includes a benthic stalked (polyp) form, and free-swimming jellyfish (medusa) form. The polyps may be found attached to docks or floats, while the medusae live in the plankton. ... The fertilized egg develops as a planktonic planula larva, until it settles on a suitable ...

The Life Cycle of a Jellyfish - Animals & Wildlife - About.com


The fertilization of eggs in the female jellyfish depends on the species. ... eggs have undergone embryonic development, they hatch and the free-swimming ... A planula is a tiny oval structure whose outer layer is lined with minute hairs called cilia. ... and eventually buds off as a tiny baby jellyfish also known as an ephyra.

Jellies FAQs – Featuring Jellyfish & Other Gelatinous Zooplankton


A conspicuous feature of cnidarian jellies is the bell, also known as the ... Covered by a very thin epidermal tissue, the rest is made up of a gelatinous material called the .... with a sessile (attached) asexual polyp phase and a free- swimming sexual ... The fertilized eggs develop into tiny ciliated larvae known as planulae that ...