Sponges

Sponge

Taxonomic classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Porifera*
Grant in Todd, 1836
Included groups

Calcarea
Hexactinellida
Demospongiae

Excluded groups

Crown radiata

Sponges (Phylum: Porifera) are asymmetric, multi-celled animals. They are sessile and aquatic, and lack nervous, digestive or circulatory systems. [1] There is evidence in the literature to suggest that animals may have evolved a nervous system twice. [2] {{Animalia}}

References

  1. ↑ http://en.wikipedia.org/wiki/Sponge
  2. ↑ http://www.sciencedaily.com/releases/2009/01/090126203157.htm
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