Obelia is sedentary, marine colonial form found attached on the surface of sea weeds, molluscan shells, rocks and wooden piles in shallow water up...
Obelia is a genus of hydrozoans , which consists mainly of marine and some freshwater sensual species and have both the polyp and medusa stages in their life cycle. The genus belongs to the phylum Cnidaria , which are all aquatic and mainly marine organisms that are relatively simple in construction.
It is also called perplexed fur. Obelia has a worldwide distribution except the high-arctic and Antarctic seas. The polyp colony reproduces asexually. During this spot of life, Obelia are confined to substrate surfaces.
On that mature colony there are secluded hydranths called gastrozooids , which can be found expanded or contracted, to aid in the growth of this organism next to feeding; the reproductive polyp gonozooids has medusa buds. Other hydranths are specialized for defense.Navigation menu
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|Kink (sexual)||The cnidarians include jellyfishes, sea anemones, corals, and hydrozoans. Of the roughly 11, living cnidarian...|
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Obelia is a genus of hydrozoans , which consists mainly of marine and some freshwater animal species and have both the polyp and medusa stages in their life cycle. From the centre of the sub-umbrella arises a short projecting manubrium L. There are now two layers of ectoderm outside the bell rudiment and one layer on the inner side.
Extracellular digestion occurs in the main part of the gastro vascular cavity and is purely proteolytic. The ocelli consist of patches of pigment and photoreceptor cells organised either within a flat disc or a pit. The gonads found in medusa are not formed in it but actually they are formed in the ectoderm of blastostyle which later on migrate into the medusa and become situated on its radial canals.
They have incomplete digestive tracts where the food enters, is digested, and expelled through the same opening.
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Polyp is the nutritive zooid of the colony. Obelia is cosmopolitan in distribution, forming a whitish or light-brown plant-like fur in the sea; hence, the common name sea-fur is assigned to it.
Such an alternation of generations between two diploid phases is known as metagenesis. The tentacles have swollen bases due to the accumulation of interstitial cells which are practically absent from other regions. In the margin of the bell, the epidermal nerve cells are usually organised and concentrated into two nerve rings, one above and one below the attachment of the velum.
- OBELIA IS A GENUS OF HYDROZOANS, WHICH CONSISTS MAINLY OF MARINE AND SOME FRESHWATER ANIMAL THE MEDUSAE REPRODUCE...
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