WebThe former is a sessile and cylindrical form like Hydra, Adamsia, etc. whereas, the latter is umbrella-shaped and free-swimming like Aurelia or jelly fish. Those cnidarians which exist in both forms exhibit alternation of generation (Metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually (e.g., Obelia) So, the ... WebIt is simplest and commonest pattern of polymorphism They have only two types of zooids (gastrozooids and gonozooids) and the phenomenon is known as dimorphism. Gastrozooids are concerned with feeding. Gonozooids related to reproduction. Exhibits by many Hydrozoan colonies. Examples: Obelia, Tubularia 2. Trimorphic:

Life cycle of Obelia English medium @Prof. Masood Fuzail

WebTrimorphism: Some species like Obelia and Plumularia are trimorphic because besides gastrozooids and medusa, they also have medusa-producing gonozooids or blastostyle. Polymorphism: Coelenterates having more than three types of individuals are called polymorphic, e.g. Hydractinia which has five types of zooids, each performing a specialized WebZoology first year.Polymorphism . Polymorphism in Obelia church street apt company

Polymorphism: Definition, Causes and Significance Cnidarians

WebPolymorphism the feature of the population which includes more than one type of structurally and functionally different individuals. For example, in Obelia shows polymorphism, the gastrozooids for feeding and the individuals capable of asexual reproduction only are the gonozooids, the blastostyles and medusae. In the species of … Obelia is a genus of hydrozoans, a class of mainly marine and some freshwater animal species that have both polyp and medusa stages in their life cycle. Hydrozoa belongs to the phylum Cnidaria, which are aquatic (mainly marine) organisms that are relatively simple in structure with a diameter around 1mm. There … See more The polyp colony reproduces asexually. During this stage of life, Obelia are confined to substrate surfaces. In mature colonies there are individual hydranths called gastrozooids, which can be found expanded or … See more Through its life cycle, Obelia take on two forms: polyp and medusa. They are diploblastic, with two true tissue layers—an See more • A Hydroid: Obelia Longissima • The Double Life of Obelia See more Estimates of divergence times and distinctive haplotypes provide evidence of glacial refugia around Iceland and southeastern … See more http://zoology.uok.edu.in/Files/cae2d08f-4f62-428e-b6ea-cf46cdccbf42/Custom/ZOO-102CR-1.4%20POLYMORPHISM.pdf church street apartments central sc