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Obelia - Wikipedia


Obelia is a genus in the class Hydrozoa, which consists of mainly marine and some freshwater ... The medusae reproduce sexually, releasing sperm and eggs that fertilize to form ... The planulae live...

Jellyfish and Comb Jellies | Smithsonian Ocean Portal


Jellyfish and comb jellies are gelatinous animals that drift through the ... Many microscopic organisms, such as bacteria, also use cilia to swim—but comb .... are genetically identical because they all come from a single fertilized egg. ... discovered a new species, which was named Tamoya ohboya in a public naming contest.

Jellyfish and Other Cnidarians - mesosyn.com


Jellyfish are cnidarians, a group of animals that also includes corals, hydras, and sea anemones. ... Several free-swimming species of Cubozoa and Scyphozoa possess ... Stinging cells called nematocyst found in cnidocyte cells. .... The fertilized egg produces a planular larva which, in most species, quickly attaches itself to ...

Jellies FAQs - Featuring Jellyfish & Other Gelatinous Zooplankton


The primary nematocyst action is located on the long, thin tentacles found on ... A conspicuous feature of cnidarian jellies is the bell, also known as the umbrella. .... with a sessile (attached) asexual polyp phase and a free-swimming sexual medusae phase. ... Eggs are fertilized externally and develop into ciliated larvae.

sponges & cnidarian notes b1 - Biology Junction


Found in the kingdom Animalia & subkingdom Parazoa ... cross-fertilize eggs during sexual reproduction; Planula is the flagellated, free-swimming larva that ...

Early Life History of the 'Irukandji' Jellyfish Carukia barnesi - Plos


Mar 8, 2016 ... tion, most eggs developed to an encapsulated planula stage and ... reproduction via lateral budding producing ciliated swimming ... drive not only the seasonal timing of medusa but also their .... Egg Fertilization and Development .... through to detachment of the free swimming secondary polyp (Fig 3IV).

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 ...

Hydra (genus) - ScienceDirect Topics


Cnidarians, including the jellyfish and hydras, lie at the base of the ... Whether these ganglia in the head can actually be called the 'brain' is ... They have also been implicated in the control of tasks that require visual ..... egg into a microscopic blastula and then into a free-swimming, ciliated, solid mouthless larva, t...

Acoelomate Animals

www.nicholls.edu/biol-ds/Biol156/Lectures/Animal Diversity 1-2.pdf

Amoebocytes - found in Mesohyl - intermediate gelatinous layer. May possess minute, needles called ... Exist as free-swimming planktonic form for a short time ... Phylum Cnidaria – jellyfish, hydras, anemonaes, corals ... Sexual reproduction produces fertilized eggs. Develops into a free swimming, ciliated planula larva ...

Reproduction and Life Cycles in Marine Animals - The Oceans Their ...


Such areas may be called areas of reproduction, or nursery areas. ... care or other protection accorded the eggs and larvae following fertilization. .... The union of germ cells results in a free-swimming, ciliated, planula larva about ... Vaughan (1919) found the pelagic period of corals to be from one day to two or three weeks.