Annelida- Alitta succinea

The organisms in Phylum Annelida are bilaterally symmetrical and vermiform, similar to the organisms in Phylum Nematoda.  Their body has more than two cell layers, including tissues and organs.  The body cavity is a true coelom, and often divided by internal septa.  The Annelida body possesses a through gut with mouth and anus.  The body also possesses 3 separate sections: a prosomium, a trunk and a pygidium.

The Phylum Annelida organisms have a nervous system with an anterior nerve ring, ganglia and a ventral nerve chord.  The organisms have a true closed circulatory system, but have no true respiratory organs.  Reproduction is normally sexual and gonochoristic or hermaphroditic.  The organisms feed a wide range of material, and they live in most environments.

Examples of the organisms belonging to Phylum Annelida include: Michrochaetus rappi, Chaetogaster annandalai, and Mesonerilla prospera.

 Annelida- Michtochaetus rappi

  1. Ramel, G. (2010). The phylum annelida. Retrieved from 

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