The animal kingdom is divided into smaller groups of phyla. Each phylum is characterized by specific evolutionary adaptations. Drag each key characteristic to the correct animal group. Soft bodies, often with a hard outer shell Segmented bodies Radial body symmetry Unsegmented parasitic worms Shares the most recent common ancestor with chordates Bilateral body symmetry Lack of tissues or body symmetry Animals with backbones Jointed appendages; most numerous and diverse phylum of animals Ancestral animal SPONGES CNIDARIANS FLATWORMS ANNELIDS MOLLUSKS ROUNDWORMS ARTHROPODS ECHINODERMS CHORDATES KEY CHARACTERISTICS
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- Segmented bodies: This is a key characteristic of Annelids, a phylum that includes earthworms and leeches. - Radial body symmetry: This is a characteristic of Cnidarians, a phylum that includes jellyfish, sea anemones, and corals. - Unsegmented parasitic worms: Show more…
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SUMMARY OF THE ANIMAL KINGDOM Compare the animal groups by placing the correct number(s) in the spaces provided. 1. Sponges 2. Cnidarians 3. Flatworms 4. Roundworms 5. Mollusks 6. Annelids 7. Arthropods 8. Echinoderms 9. Chordates Bilateral symmetry in adult Radial symmetry in adult Saclike body plan Endoskeleton Tube-within-a-tube body plan Organ level Ectoderm, endoderm, mesoderm Exoskeleton Dorsal tubular nerve cord Ventral nerve cord(s) Organ system level Tissue level Pseudocoelomate Protostomate Cellular-tissue level Pharyngeal gill pouches Gas-exchange organs Circulatory system Excretory organs Eucoelomate Notochord Acoelomate Water vascular system Ectoderm and endoderm only Exoskeleton, jointed appendages No skeleton, segmentation
Madhur L.
KEY TO MAJOR ANIMAL PHYLA 1. A. Body is soft with numerous pores, no appendages or obvious sensory organs. . . . . . . . . Phylum Porifera B. Body is symmetrical with clear appendages or sensory organs . . . . . . . . . . . . . . . . 2 2. A. Body shows radial symmetry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 B. Body shows bilateral symmetry or is worm-like or has a shell . . . . . . . . . . . . . . . . 4 3. A. Body is soft and smooth, mouth region is usually surrounded by tentacles . . . . . . . . . . . . . Phylum Cnidaria B. Body is spiny . . . . . . . . . . Phylum Echinodermata 4. A. No gills, three or more appendages (if present) or no appendages (snakes not included) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 B. Gills present or 2 pairs of appendages (including snakes) . . . . . . Phylum Chordata 5. A. Body includes jointed appendages with an exoskeleton . . . . . . Phylum Arthropoda B. Body without jointed appendages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6. A. Body is soft and flat, no segmentation . . . . . . . . . . . . . . . . Phylum Platyhelminthes B. Body is not soft, flat, or does show segmentation. . . . . . .. . . . . . . . . . . . . . . . . . . . . 7 7. A. Body is worm-like with segments . . . . . . . . . . . . . . . . . . . . . Phylum Annelida B. Body is not segmented . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8. A. Body is slender, smooth, worm-like, but not flat . . . . . . . . . . . . . Phylum Nematoda B. Body is covered by a shell or has tentacles or paired eyes or antennae. . . . . . . . . . . . . . . . . Phylum Mollusca
Anand J.
The table below lists the common names of the nine animal phyla surveyed in this chapter. For each phylum, list the key characteristics and some representatives. $$\begin{array}{|l|l|l|}\hline \text { Phylum } & \text { Characteristics } & \text { Representatives } \\\hline \text { Sponges } & & \\\hline \text { Cnidarians } & & \\\hline \text { Flatworms } & & \\\hline \text { Nematodes } & & \\\hline \text { Molluscs } & & \\\hline \text { Annelids } & & \\\hline \text { Arthropods } & & \\\hline \text { Echinoderms } & & \\\hline \text { Chordates } & & \\\hline\end{array}$$
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