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Poriferas Embryological development include the male sponge releasing the sperm into the water. The Sponges are symmetrically radial.  They have no tissues. The Major Group in this Phyla is the sea sponge.  This is different from other groups because they have absolutely no tissues.  The sponges

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The Major groups of the Cnidarians are the Hydrozas, Scyphozas and the Anthozas.  These Species reproduce sexually.  One of the Major types of the Cnidarians is the Sea Jelly, not the Jelly Fish because Jellys are not fish.  Their bodies consist of mesoglea, a non-living jelly-like substance, which is smushed between two layers of epithilium that are mostly one cell thick.

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By: Michael Ray

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An important characteristic this Phylum is the fact that they eat dead bacteria. They produce sexually and asexually. they can develop from an unfertilized egg.  The major groups are as follows, the Monogononta, Bdelloidea, and Seisonidea.  The major differences is that the monogononta is found in freshwater and soil, along with the bdelloids.

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Another name for this Phylum is the flatworm. They are Acoelomates. They have a sac body plan. They have 1 opening and no digestive track. Flatworms are able to reproduce sexually and Asexually because they have both male and female reproductive parts.  The different classes are Turbellaria (planarians), Trematoda (flukes), and Cestoda (tapeworms),

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Porifera
Cnideria
Rotifera
Platyhelminthes
Annelida
Molusca
Arthropoda
Echinodermata
Chordata

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Most of the species in this Phylum reproduce sexually, some sea stars and cucumbers can produce asexually.  the major groups are the Asteroidea (sea stars or starfish), Ophiuroidea (brittle stars), Holothuroidea (sea cucumbers), Echinoidea (sea urchins), and Crinoidea (sea lilies or feather stars). These organisms are symmetrically radial.  An interesting fact is that they can be cut into 2 separate pieces and grow that part back.

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The Major classes of the Arthropodas are Arachnida (King Crabs), Crustacea(crabs lobsters, shrimps, barnacles). The groups are different in that These Organisms reproduce Sexually.  They are different in that their bodily make-up is completely different.  Crabs have characteristics that others do not.  Lobsters have extreme flexibility. Crabs, lobsters and shrimp are all Bilaterally symmetrical.

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For the most part, the chordates reproduce sexually, meaning sperm and egg.  The  3 major groups within this phylum are the Ascidiacea (sea squirts), the  Leptocardii (lancelets), and the vertebrates(backbones). What makes each group in this phylum different is their bodily characteristics. there is one whole entire group dedicated to backbones. Their life cycle starts when the sperm meets the egg and that is within the water.

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The most important characteristic of all Mollusca is that they are bilaterally symmetrical. The major groups are the Gastropods, the bivalves and the cephalopods. the differences between the groups are the types of shells that they either have or don't have. The female squid leaves the egg in the water column and it takes about 2 weeks to hatch, for squid.

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Annelids are bilaterally symmetrical. They are coelomates. The Major groups are the Polychaeta, Oligochaeta, and the Hirudinea. The main difffernece that i spotted between the groups is that the Oligochaetas are terrestrial.. Annelids can produce both asexually and sexually. Worms.