WebAn example of cnidarian dimorphism can be seen in the colonial hydroid Obelia. The sessile asexual colony has two types of polyps, shown in (Figure 3). The first is the gastrozooid, which is adapted for capturing prey and … WebObelia is a typical representative of colonial hydrozoa (Fig. 12.14). It is exclusively marine. It exists in two principal forms, the polyp and the medusa. The polyp or hydroid form represents the asexual phase of its life-history and the medusoid form represents the sexual phase. There is an alternation of these two phases or generations ...
Phylum Coelenterata- Characteristics And their Classification
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 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: grand pontife auguste
Polymorphism in Hydrozoa
WebDec 30, 2024 · Obelia is a colonial coelenterate which lives in marine water.#obelia #colonialcoelenterate #polymorphism #polymorphism_in_coelenterate #alternation_of_gener... WebTrimorphism: Trimorphic species include Obelia and Plumularia, which feature medusa-producing blastostyle or gonozooids in addition to gastrozooids and medusa. … WebThe Polymorphic Transformations of Obelia. The Polymorphic Transformations of. Obelia. J Cell Sci (1949) s3-90 (11): 235–264. The growth cycle of O. commissularis McCrady is … grand pontife romain