Identify the cnidarian that is correctly matched with its common name.

Correct option is D

The correct answer is (d) Physalia - Portuguese man-of-war

Explanation:

• The Portuguese man-of-war (Physalia physalis) is a well-known cnidarian that is often mistaken for a jellyfish due to its appearance.
• However, it is not a true jellyfish but a colonial organism made up of multiple polyps that work together as one entity.
• The "man-of-war" name comes from the sail-like structure on its top, resembling a 17th-century warship.

Information Booster:

• Cnidarians are a group of simple aquatic animals that include species like jellyfish, corals, and sea anemones.
• They are characterized by their radially symmetric body structure and specialized cells known as cnidocytes that contain stinging cells (nematocysts), used for capturing prey and defense.

Classification of Cnidarians:

Cnidarians can be classified into several groups:

• Hydrozoa: Includes species like the Portuguese man-of-war (Physalia), which is a colonial organism.
• Scyphozoa: Includes true jellyfish, which are solitary and more commonly recognized as jellyfish.
• Anthozoa: Includes corals and sea anemones, which are often sessile and form important marine ecosystems.
• The Portuguese man-of-war is found in tropical and subtropical oceans and has a dangerous sting.

Additional Knowledge:

• Pennatula refers to a type of sea pen. Sea pens are colonial cnidarians with a feather-like structure, while sea-fans (e.g., Gorgonia) have a flat, fan-shaped structure.
• Gorgonia refers to a genus of sea fan, a type of colonial cnidarian, while sea anemones belong to a different group within the phylum Cnidaria, classified under Anthozoa.
• Adamsia refers to a genus of sea anemones, not a sea-pen. Sea pens belong to the order Pennatulacea, a distinct group of cnidarians.