Phylum Chordata

Phylum Chordata - Phylum Chordata ALL HAVE - A notochord- a...

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Phylum Chordata ALL HAVE - A notochord- a flexible, supporting rod - A dorsal, hollow nerve cord - Pharyngeal gill slits - Post-anal tail THREE SUBPHYLA - Urochordata- a.d.a. Tunicata Both are invertebrates - Cephalochordata - Vertebrata SUBPHYLUM UROCHORDATA - Sessile marine animals that are found attached to underwater rocks or boats. - Often u-shaped - Filter-feeders - Water passes through pharyngeal gill slits to cilia that carry food to the stomach - Dorsal hollow nerve chord and notochord are absent in the adult urochordates but are found in some of the larval forms Morgula - has both incurrent and excurrent siphons, a pharynx with gill slits, and a tunic that is made of a cellulose-like material that is unique in the animal kingdom - Feeding- the H 2 O comes in the incurrent siphon and goes through the pharynx with gill slits and the food is filtered out and moved to the stomach by cilia. SUBPHYLUM CEPHALACHORDATA - Show all four characteristics in the adult form. - Commonly called sea lancets - Most studied is the Amphioxus - Filter-feeders - Use muscles (myomeres) to burrow their tail into the sand so that the mouth and tentacles called cirri are exposed. Seawater is drawn into the mouth by cilia and the tiny food particles that are giltered off in to the pharynx are massed to the intestine. Excess water
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This test prep was uploaded on 04/20/2008 for the course BIO 112 taught by Professor Godsel during the Spring '08 term at Loyola Chicago.

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Phylum Chordata - Phylum Chordata ALL HAVE - A notochord- a...

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