In this article we will discuss about the life cycle of obelia, explained with the help of suitable diagrams. Description of Obelia: 1. It is a branched, fixed colony (Fig 20.12). Some of the horizontal branches anchoring the colony on some support are called Hydrorhiza while other branches are vertical and known as Hydrocaulus. 2. Each branch consists of a [...]
In this article we will discuss about Obelia (Sea Fur):- 1. Introduction to Obelia 2. Structure of Obelia 3. Movement 4. Nutrition 5. Respiration, Circulation and Excretion. Contents: Introduction to Obelia Structure of Obelia Movement in Obelia Nutrition in Obelia Respiration, Circulation and Excretion in Obelia 1. Introduction to Obelia: Obelia is a typical example of a marine, colonial hydrozoan. [...]
The following points highlight the top two phases of obelia. The phases are: 1. Hydroid or Polyp Phase 2. Medusoid Phase. Obelia: Phase # 1. Hydroid or Polyp Phase: Hydroid stage of Obelia is in a colonial form. It is a branched filament like structure and remains attached with the substratum. This colony is polymorphic, i.e., number of individuals or [...]