Explain the pennatula of class anthozoa and phylum cnidaria of non chordates?

The pennatula is also known as sea pen or sea father. It resides in the sandy areas of warm sea. It occurs in colonies and is sedentary. It is of carnivorous type. Their colony resembles a feather and is bilateral symmetrical. It consists of bulb end, peduncle, rachis, pinnules, autozooids and siphonozooids. Their colony is dimorphic with zooids of two types that are autozooids and siphonozooids. Siphonozooids occur on the sides of rachis and cause the circulation of water. Autozooids occur in the single row and are nutritive in function.

Category: Non Chordate

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