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Chapter 15 Agnatha The class of jawless fishes: hagfishes and lampreys. ahermatypic Describing coral species lacking symbiotic zooxanthellae and incapable of secreting calcium carbonate at a rate suitable for reef production. animal A multicellular organism unable to synthesize its own food and often capable of movement. Animalia The kingdom to which multicellular heterotrophs belong. Annelida The phylum of animals to which segmented worms belong. Arthropoda The phylum of animals that includes shrimp, lobsters, krill, barnacles, and insects. The phylum Arthropoda is the worlds most successful. Asteroidea The class of the phylum Echinodermata to which sea stars belong. Aves The class of birds. baleen The interleaved, hard, fibrous, hornlike filters within the mouth of baleen whales. bilateral symmetry Body structure having left and right sides that are approximate mirror images of each other. Examples are crabs and humans. Compare radial symmetry. Bivalvia The class of the phylum Mollusca that includes clams, oysters, and mussels. Carnivora The order of mammals that includes seals, sea lions, walruses, and sea otters. cartilage A tough, elastic tissue that stiffens or supports. Cephalopoda The class of the phylum Mollusca that includes squid, octopuses, and nautiluses. Cetacea The order of mammals that includes porpoises, dolphins, and whales. chitin A complex nitrogen-rich carbohydrate from which parts of arthropod exoskeletons are constructed. chiton A marine mollusk of the class Polyplacophora. Chondrichthyes The class of fishes with cartilaginous skeletons: the sharks, skates, rays, and chimaeras. Chordata The phylum of animals to which tunicates, Amphioxus, fishes, amphibians, reptiles, birds, and mammals belong. chromatophore A pigmented skin cell that expands or contracts to affect color change. Cnidaria The phylum of animals to which corals, jellyfish, and sea anemones belong. cnidoblast Type of cell found in members of the phylum Cnidaria that contains a stinging capsule. The threads that evert from the capsules assist in capturing prey and repelling aggressors. consumer A ctrophic organism. coral Any of more than 6,000 species of small cnidarians, many of which are capable of generating hard calcareous (aragonite, CaCO3) skeletons. countershading A camouflage pattern featuring a dark upper surface and a lighter bottom surface. Crustacea The class of phylum Arthropoda to which lobsters, shrimp, crabs, barnacles, and copepods belong. cryptic coloration Camouflage; may be active (under control of the animal) or passive (an unalterable color or shape). drag The resistance to movement of an organism induced by the fluid through which it swims. Echinodermata The phylum of exclusively marine animals to which sea stars, brittle stars, sea urchins, and sea cucumbers belong.... View Full Document

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