Tag Archives | Phylum Cnidaria

Metagenesis and Polymorphism | Phylum Cnidaria

The relationship between metagenesis and polymorphism has raised the question—is metagenesis an outcome of polymorphism or has it lead to the emergence of polymor­phism? A discussion on the existence of different grades of metagenesis in cnidarians will help us to find a logical answer. Gradations of Metagenesis: Four differ­ent forms of life-histories are seen in the cnidarians which exhibit a [...]

By |2016-05-27T11:35:29+00:00May 27, 2016|Phylum Cnidaria|Comments Off on Metagenesis and Polymorphism | Phylum Cnidaria

Comparison between Aurela and Urticina | Phylum Cnidaria

Learn about the comparison between Aurela and Urticina. Comparison # Aurelia: 1. Aurelia is elongated tube-like body with narrow proximal end differenti­ated into stalk for attachment. 2. Aurelia is about 1.5 cm in height. 3. Distal tentacle: 16 solid tentacles developed in regular order (4 per-radial, 4 inter-radial and 8 ad-radial ten­tacles). 4. Manubrium is present in Aurelia. 5. Mouth [...]

By |2016-05-27T11:35:29+00:00May 27, 2016|Phylum Cnidaria|Comments Off on Comparison between Aurela and Urticina | Phylum Cnidaria

Different Classes of Phylum Cnidaria

In this article we will discuss about the interrelationships between the different classes of phylum Cnidaria. Class Hydrozoa represents the most primitive forms amongst the Cnidarians. The lowest hydrozoan form is exhibited by Hydra and the hydrula stage of some Hydrozoa. The relationship between Hydrozoa and Scyphozoa is not very clear. In spite of this, it can be suggested that [...]

By |2016-05-27T11:35:18+00:00May 27, 2016|Phylum Cnidaria|Comments Off on Different Classes of Phylum Cnidaria
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