Archive | Phylum Cnidaria

Master Notes on Cnidarians (With Diagram)

Master Notes on Cnidarians:- 1. Protohydra 2. Halistemma 3. Physalia 4. Porpita 5. Velella 6. Diphyes. Cnidarian # 1. Protohydra: Protohydra (Fig. 12.29A) is a peculiar hydra of 3 mm in length. It lacks the usual tentacles. It is available along the shores of Great Britain and northern part of Europe. Protohydra feeds on nematodes and small crustaceans and propagates [...]

By |2016-05-27T11:35:29+00:00May 27, 2016|Phylum Cnidaria|Comments Off on Master Notes on Cnidarians (With Diagram)

An Example of Phylum Cnidaria: Aurelia

In this article we will discuss about Aurelia:- 1. Structure of Aurelia 2. Sense Organs of Aurelia 3. Histology 4. Life History. Structure of Aurelia: Adult Aurelia represents medusoid stage. It has the typical form of a medusa (Fig. 12.18). But the concave and convex sides of the umbrella are more pronounced. The edge of the umbrella is provided with [...]

By |2016-05-27T11:35:29+00:00May 27, 2016|Phylum Cnidaria|Comments Off on An Example of Phylum Cnidaria: Aurelia

Histological Organisation of Cnidarians

In this article we will discuss about the histological organisation of Cnidarians. 1. Ectoderm: In most cases it is distinctly cellular. Presence of ciliated ectoderm in larĀ­val cnidarians is usually seen. The cellular ectoderm is mainly composed of the supĀ­porting cells, called the Epitheliomuscular cells. They are usually cuboidal or columnar in shape. They may be thin and flattened (exumbrellar [...]

By |2016-05-27T11:35:29+00:00May 27, 2016|Phylum Cnidaria|Comments Off on Histological Organisation of Cnidarians
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