GENERAL HISTOLOGY

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OESOPHAGUS STOMACH

ECHINODERMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The largest class in phylum cnidaria is class ____, which includes ____
A
Anthozoa, jellyfish
B
Hydrozoa, siphonopores
C
Anthozoa, corals and anenomes
D
Scyphozoa, jellyfish
Explanation: 

Detailed explanation-1: -Within the phylum Cnidaria, the class Anthozoa includes corals, anemones, sea pens and seafans. Anthozoa consists of 10 orders and thousands of species. Adults are attached to the seabed, but their larvae are free-floating and can drift to new settlements.

Detailed explanation-2: -Corals are anthozoans, the largest class of organisms within the phylum Cnidaria. Comprising over 6, 000 known species, anthozoans also include sea fans, sea pansies and anemones.

Detailed explanation-3: -Subclass Hexacorallia (= Zoantharia) of cnidarian class Anthozoa currently contains six orders: Actiniaria (sea anemones), Antipatharia (black corals), Ceriantharia (tube anemones), Scleractinia (stony corals), Corallimorpharia (corallimorpharians), and Zoanthidea (zoanthids).

Detailed explanation-4: -The phylum Cnidaria is made up of four classes: Hydrozoa (hydrozoans); Scyphozoa (scyphozoans); Anthozoa (anthozoans); and Cubozoa (cubozoans).

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