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. [1]

Obelia, genus of invertebrate marine animals of the class Hydrozoa (phylum Cnidaria). The genus, widely distributed in all the oceans, is represented by many species. The animal begins life as a polyp—a tentacled, stalklike form resembling a small sea anemone attached to the ocean bottom or some other solid surface.

Obelia is sedentary, marine colonial form found attached on the surface of sea weeds, molluscan shells, rocks and wooden piles in shallow water up to 80 metres in depth. 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.

Feb 20, 2024 · Obelia are diploblastic, primitive organisms with a unique life cycle in the Animal Kingdom. The Obelia life cycle alternates between two phases, each having a different structure and function. This is called the alteration of generation.

Obelia is a sedentary, marine colonial life form that attaches to seaweeds, rocks, timber piles, and molluscan shells in shallow water. Obelia starts out as small, motionless animals with stalks and tentacles that resemble sea anemones.

Obelia is a very tiny marine hydroid with a height of 2 cm or a little more. The obelia’s body has two kinds of filaments which are vertical hydrocaulus and horizontal hydrorhiza. Obelia’s life cycle begins as hydroid polyps. Hydroid polyps are small, …

Mar 21, 2024 · Obelia is a marine colonial form found clinging to seaweed, mollusk shells, rocks, and timber piles in shallow water up to 80 metres deep. The international spread of Obelia, which forms a white or light-brown plant-like fur in the sea, has earned it the common name sea-fur.

Obelia occurs as a delicate whitish or light brown, almost fur-like growth on seaweeds or timber. It consists of branched filaments approxi­mately the thickness of fine sewing cotton. A common example of it is Obelia geniculata. Habit and Habitat: Obelia is typically marine, colonial and sedentary, having cosmopolitan distribution.

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.

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.