Phylum Ctenophora (Comb jellies.  Free swimming; biradiate, with two tentacles and eight longitudinal rows of cilliary combs.  Marine

• Class Tentaculata (Ctenophors with tentacles.)
• Order Cydippida* (Body rounded or oval; tentacles branched and retractile into sheaths.  Mertensia, Pleurobranchia*)
• Order Lobata (Body moderately compressed with two large oral lobes to either side of the tentacular plane.  Small tentacles not in sheaths.  Mnemiopsis*, Bolinopsis, Leucotheca)

September 29, 2013