In this article we will discuss about the nauplius, zoea and megalopa larva of crustaceans with the help of suitable diagrams. Nauplius Larva of Crustaceans: Fig. 147 NAUPLIUS LARVA W.M 1. It is the slide of Nauplius larva, which is the earliest free swimming stage in the development of crustaceans. 2. Body is some what fusiform or pear shaped and [...]
In this article we will discuss about the structure of Euspongia or Spongia with the help of a diagram. 1. It is a marine sponge of commercial value and is found in Mediterranean Sea, West Indies and along American coasts. 2. It is commonly found in shallow water attached to substratum. 3. Skeleton is made up of spongin fibres. The [...]
In this article we will discuss about the structure of Sycon with the help of a diagram. 1. It is a marine, colonial and hermaphrodite sponge which is found attached to rocks near sea shore in shallow waters. 2. Each sponge is a vase-like cylinder perforated with numerous ostia all over and a large osculum at the apex. 3. Osculum [...]