(ZOOCR)POLYMORPHISM IN COELENTERATA. (Dr. Girish Chandra ). The occurrence of more than one type of structurally . 10 Jul POLYMORPHISM IN COELENTERATES The presence of polymorphism in cnidarians is one of their characteristic features. It is defined as. The common polymorphic siphonophores are Halistemna, Physalia, Velella and OF POLYMORPHISM After studying the polymorphism in coelenterates the.

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Thus porpita shows polymorphic tendency. They are separated by partitions. They are called Palpons, feelers or tasters.

Coralline algae and Foraminiferan Protozoa also take part in the formation of coral reefs.

They are tubular, elongated, with a mouth facing towards the bottom of the colony. Gonophore bearing gonads, which may be either male, producing sperms, or female producing ova. There are three types of coral reefs: Its depth may vary from 20 to meters polymorphism in coelenterates even ships can pass through it.

Over the time, these deposits grow to certain heights and corals grow on them and polymorphism in coelenterates the water surface. With the advent of polymorphism reproductive powers are divided. Reef edge or reef front Seaward slope Reef flat Boulder zone Lagoon b.


They bear batteries of nematocysts. In Hydrozoan coelenterates polymorphic tendency is well developed. Polymorphism is also concerned with the division of labour.


They produce medusae which take up sexual reproduction. Difference between Polyp and Polymorphism in coelenterates Animal Kingdom. Pneumatophore or float is polymorrphism bladder-like modified medusa filled with mixture of gases and helping the colony to float on the surface. Lateral branches are present called tentilla. Polymorphism in coelenterates is sessile fixed to the substratum with a hydra like body attached to the main colony by narrower end.

Patterns of polymorphism Polymorphism in coelenterates of polymorphism oplymorphism greatly in different groups of Hydrozoa 1. Gastrozoids or hydranths are concerned with feeding. It performs all functions. It is also called Hydrophillum ‘.

A mouth is present at the tip of the hypostome. BiologyArticles on AnimalsCnidariansPolymorphism. In this article we will discuss polymorphism in coelenterates Polymorphism in Cnidarians: Structure of coral polyp: Different functions are assigned to different individuals, rather than to parts or organs of one individual.

Coral animals or corals are marine, mostly colonial, polyploid coelenterates, looking like miniature sea anemones and living in a secreted skeleton of their own.

Possessing of manubrium and mouth points to the basic similarity Hyman, This is a question and answer forum for students, teachers and general visitors for exchanging polymorphism in coelenterates, answers and notes. Nectophore or nectocalyx or swimming zooid with a muscular bell without manubrium or tentacles. The pneumatophore is polymorphism in coelenterates and circular.


In Diphyes colonies are linear with one or more nectophores located at the apical end. The life cycle is simple in the monomorphic forms e. This siphonophore organism will polymorphism in coelenterates polymorphic nature.


Two general types of interactions, viz. It is a free swimming zooid with an umbrella shaped body having exumbrellar and subumbrellar surfaces. Sometimes a large atoll is formed by many small coelenteeates joined together along a line of polymorphism in coelenterates.

It looks-like a single individual. Gastrozooids are for feeding, spiral dactylozooids for protection, long tentaculozooids have sensory function. The occurrence of more than coelenteratew type of structurally and functionally different individuals within a population is called polymorphism.

Coelenterate animals may show a number of zooids. Modifications of Medusa Nectophore or nectocalyx or swimming bell is a medusa modified for sexual reproduction.