Character | State 1 | State 2 | State 3 ------- | -------- | -------- | -------- Unique 18S rDNA sequence | yes (y) | no (n) | Type of skeleton | hydrostatic (h) | ecto (ec) | endo (en) | does not apply (-) Segmentation | yes (y) | no (n) | does not apply (-) Notochord | yes (y) | no (n) | Trochophore larvae | yes (y) | no (n) | Elongate cylindrical body | yes (y) | no (n) | Molt | yes (y) | no (n) | Radial cleavage | yes (y) | no (n) | Multicellular | yes (y) | no (n) | Symmetry | bilateral (b) | radial (r) | does not apply (-) Germ layers | 2 | 3 | does not apply (-)
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Table 1: Phylum Characteristics Table Bilateral phylum with segmentation. Most have a calcium containing shell. Five-part symmetry. Specialized cell, but no tissues. Mantle of tissue covering the body. Hollow body cavity for food. Three tissue layers, no body cavity. Setae used for movement. Jaws and skulls part of evolution. Complete digestive tract. Parasites. Water flows through canals of body. The first to have jointed legs. The first phylum to fly. Some have stinging cells. More complex because of more DNA. Body design is a tube within a tube. Tube feet. First muscle and nerves. Internal skeleton. All live in the sea. Simple animals with bilateral symmetry. Entrance and exit the same in the digestive tract. All have vertebral column. Champions of variations in appendages. Has the most species. Have spines covered with a thin skin. Some stationary polyps. Some are mobile medusa. Some propel using their siphon. Muscular foot used to move. Stationary animal. Tubular mouth at the mid-body. Humans. Hard but flexible bodies with small plates. Spicules are the skeleton. Radula used to feed. No symmetry. Exoskeleton. Their burrowing has affected the global climate.
Supreeta N.
Complete the following table by checking the characteristics that belong to each taxonomic group. Use "+" if present in the phylum or class, and "0" if absent. Remember, traits can build on one another, and just because a trait is different in one organism, doesn't mean it is not present albeit in a different form in another organism.
Marisa A.
Characters to map: Articulated (jointed) limbs Bilateral symmetry Body segmentation* Cephalization Distinct nerve cord Pharyngeal gill slits* Radial symmetry* True tissues * occurs twice multicellularity Cladogram for Invertebrates
Adi S.
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