However Janussen, Steiner and Zhu ( 2002 ) opposed this view, arguing that : spongin does not appear in all Porifera, but may be a defining feature of the demosponges; the silica-based spines of demosponges are filter-feeders.
42.
"' Hexactinellid sponges "'are sponges with a skeleton made of four-and / or six-pointed classified along with other sponges in the phylum Porifera, but some researchers consider them sufficiently distinct to deserve their own phylum, "'Symplasma " '.
43.
*Aguilar-Camacho, Jose Maria, Jose Luis Carballo, and Jose Antonio Cruz-Barraza . " Acarnidae ( Porifera : Demospongiae : Poecilosclerida ) from the Mexican Pacific Ocean with the description of six new species . " Scientia Marina 77.4 ( 2013 ) : 677-696.
44.
Invertebrate sea life includes Cnidaria such as jellyfish and sea anemones; phyla Platyhelminthes, Nemertea, Annelida, Sipuncula, Echiura, Chaetognatha, and Phoronida; Mollusca including shellfish, squid, octopus; Arthropoda including Chelicerata and Crustacea; Porifera; Bryozoa; Echinodermata including starfish; and Urochordata including sea squirts or tunicates.
45.
The intertidal zone is also home to many several species from different taxa including Porifera, Annelids, Coelenterates, Mollusks, Crustaceans, Arthropods, etc . Water is available regularly with the tides but varies from fresh with rain to highly ecologies, and the littoral zone is a prime example of a sea and more things
46.
For example, you should quickly realize that Porifera and Placozoa don't have any legs, Chordata either have no legs or four legs, etc . Aside from the aforementioned examples located under Arthropoda and Mollusca, other places to look are Annelida ( if parapodia count as legs ), Tardigrada, Lobopodia, Echinodermata, etc .-and that's a brief glance through.
47.
These communities host sponges ( Porifera ), sea anemones, jellyfish ( Cnidaria ), sea mats and hornwrack ( Bryozoa ), segmented worms ( Annelida ) snails, bivalves, squids and octopuses ( Mollusca ), starfishes and sea urchins ( Echinodermata ), crabs, lobsters and shrimps ( Arthropoda ) and little known groups such as Echiura, Priapulida, Sipuncula, Brachiopoda, Pogonophora, Phoronida and Hemichordata.
48.
Many other phyla are found there : Porifera ( sponges ) and Priapulida ( burrowing worms which were ambush predators ), Brachiopoda ( these had bivalve-like shells, but fed by means of a lophophore, a fan-like filter which occupied about of half of the internal space ), Chaetognatha ( arrow worms ), Cnidaria, Ctenophora ( comb jellies ), Echinodermata, Hyolitha ( Lophophorata with small conical shells ), Nematomorpha, Phoronida ( horseshoe worms ), and Protista.
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