Term
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Definition
| Hollow ball of cells that the animal zygote develops into. |
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Term
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Definition
| Process of forming and segregatin specific layers of tissue |
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Term
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Definition
| A sexually immature form that may look very different from the adult |
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Term
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Definition
| Choanoflagellates, fungi, and animals |
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Term
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Definition
| Clade that only includes sponges, characterized by no true tissues |
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Term
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Definition
| Animals that have true tissues (anything but sponges). |
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Term
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Definition
| Body has the general form of a wheel or a cylinder, and similar structures are regularly arranged as spokes to form a central axis. Includes jellies, sea anemones, sea stars, etc. |
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Term
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Definition
| Parts of the body have become specialized so that only two planes can divide the body into similar halves |
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Term
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Definition
| Can be divided through only one plane to produce roughly equivalent right and left halves that are mirror images |
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Term
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Definition
| Development of a head where sensory structures are concentrated |
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Term
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Definition
| Back surface of an animal |
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Term
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Definition
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Term
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Definition
| Toward the head of an animal |
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Term
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Definition
| Toward the tail end of an animal |
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Term
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Definition
| Located toward teh midline of the body |
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Term
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Definition
| Toward one side of the body |
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Term
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Definition
| Structure located above some point of reference |
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Term
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Definition
| Structure located below some point of reference |
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Term
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Definition
| Divides the body into right and left parts |
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Term
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Definition
| Divides the body into dorsal and ventral parts |
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Term
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Definition
| Cuts at right angles to the body axis and separates anterior and posterior parts |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Outer germ layer, gives rise to outer covering of the body and to nervous tissue |
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Term
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Definition
| Inner germ layer, forms lining of the digestive tube and otehr digestive structures |
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Term
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Definition
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Term
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Definition
| Gives rise to most other body structures, including muscles, skeletal structures, and circulatory system (when present) |
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Term
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Definition
| A fluid-filled space between the body wall and the digestive tube |
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Term
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Definition
| No body cavity, solid body |
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Term
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Definition
| Have a true coelom, "tube within a tube" body plan, coelom is attached to outer lining by mesoderm |
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Term
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Definition
| Have a coelom, not connected with mesoderm |
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Term
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Definition
| Have spiral cleavage, fate of each embryonic cell determined, include mollusks, annelids, and arthropods |
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Term
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Definition
| Have radial cleavage, fate of each embryonic cell undetermined |
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Term
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Definition
| Early cell divisions are diagonal to the polar axis, resulting in a spiral shape |
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Term
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Definition
| Early cell divisions are either parallel or at right angles to the polar axis |
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Term
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Definition
| Each embryonic cell has a determined fate |
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Term
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Definition
| Each embryonic cell has an undetermined fate |
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Term
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Definition
| Opening to the outside formed during gastrulation. Protostomes use it ot make a mouth, deuterostomes use it to make an anus |
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Term
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Definition
| Mesoderm splits to form coelom (protostomes) |
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Term
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Definition
| Mesoderm forms "outpocketings" and pinch off to make pouches to form the coelom (deuterostomes) |
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Term
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Definition
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Term
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Definition
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Term
| Collar cells (choanocytes) |
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Definition
| Flagellate cells on sponges |
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Term
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Definition
| Central cavity of sponge, not a digestive cavity |
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Term
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Definition
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Term
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Definition
| Specialized tubelike cells in sponges that form pores |
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Term
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Definition
| Slender skeletal spikes in sponges that support the sponge body |
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Term
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Definition
| Radially symmetrical marine organisms made up of a hollow sac with the mouth and tentacles located at one end |
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Term
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Definition
| Class that includes hydras and Portuguese man-of-wars |
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Term
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Definition
| Class that includes jellyfish |
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Term
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Definition
| Class that includes sea anemones and corals |
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Term
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Definition
| Cells with stinging organelles |
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Term
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Definition
| Stinging thread capsules within the cnidocytes |
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Term
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Definition
| Where cnidarians digest food |
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Term
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Definition
| Gelatinous flesh layer between epidermis and gastrodermis in cnidarians |
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Term
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Definition
| Contractile cells of epidermis and gastrodermis act on the water-filled gastrovacular cavity to form the hydrostatic skeleton, which allows them to move |
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Term
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Definition
| Small, ciliated larva produced by anemones and corals |
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Term
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Definition
| Phylum including comb jellies |
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Term
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Definition
| Clade including platyhelminthes, nemerteans, mollusks, annelids, the lophophorate phylum and rotifers |
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Term
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Definition
| Phylum including flatworms: flat, elongated, acoelomate animals that are bilaterally symmetrical |
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Term
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Definition
| Classes that include flukes |
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Term
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Definition
| Class that includes tapeworms |
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Term
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Definition
| Structures that function in osmoregulation and metabolic waste disposal in planarians |
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Term
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Definition
| Turbellarian flatwomrs found in ponds and streams |
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Term
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Definition
| Planarian "ears" which serve as organs of chemoreception, important in locating food |
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Term
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Definition
| The first portion of the planarian digestive tube |
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Term
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Definition
| Collecting cells equipped with cilia, found at the end of protonephridia. The cilia beat to channel waste out of the body. |
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Term
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Definition
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Term
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Definition
| Segments that form the body of a tapeworm |
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Term
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Definition
| Phylum that includes ribbon worms |
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Term
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Definition
| Long, hollow muscular tube that can be rapidly everted from the body. The proboscis wraps around prey and sometimes can secrete toxic fluids. Ribbon worms have these. |
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Term
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Definition
| The chamber surrounding the proboscis in ribbonworms |
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Term
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Definition
| The phylum that includes clams, oysters, snails, slugs, octopods, and the giant squid |
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Term
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Definition
| Body organs concentrated above the foot of a mollusk |
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Term
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Definition
| Thin sheet of tissue that covers the visceral mass of mollusks and usually contains glands that secrete a shell |
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Term
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Definition
| Belt o teeth in the mouth region of mollusks |
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Term
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Definition
| The main body cavity of mollusks, containing blood |
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Term
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Definition
| The hemolymph of mollusks baths the tissuse directly |
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Term
| Closed circulatory system |
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Definition
| Blood flows through a complete circuit of blood vessels, squuid and octopods have this |
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Term
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Definition
| Free-swimming, top-shaped larva with two bands of cilia around its middle. This is the larval stage of mollusks. |
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Term
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Definition
| Trochophore larva turn into this. Veliger larvae have a shell, foot, and mantle. Only mollusks can have veliger larvae. |
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Term
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Definition
| Class that consists of chitons |
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Term
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Definition
| Class that includes snails, slugs, and their relatives |
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Term
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Definition
| Land snails that have lungs |
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Term
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Definition
| Twisting of the visceral mass, a unique feature of the gastropod |
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Term
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Definition
| Class including clams, oysters, mussels, scallops, and their relatives |
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Term
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Definition
| Extension of a bivalve's mantle that takes water in |
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Term
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Definition
| Extension of a bivalve's mantle that pushes water out |
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Term
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Definition
| Class of animals including octopods and the nautilus |
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Term
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Definition
| Phylum including segmented worms |
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Term
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Definition
| Bristle-like structures located on each segment of womrs that provide traction as they move |
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Term
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Definition
| Class that includes marine worms that swim freely in the sea, burrow in the mud near the shore, or live in tubes they secrete or make by cementing bits of shell and sand together with mucus |
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Term
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Definition
| Paddle-shaped appendages on each segment of polychaetes |
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Term
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Definition
| Class that includes earthworms |
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Term
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Definition
| Class that includes leeches |
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Term
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Definition
| A ciliated ring of tentacles that surrounds the mouth, specialized for capturing suspended particles in the water |
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Term
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Definition
| Multicellular aquatic invertebrates with crown of cilia on their anterior end |
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Term
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Definition
| Clade including nematodes and arthropods |
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Term
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Definition
| Characteristic of ecydosozoans, the shedding of the cuticle |
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Term
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Definition
| Phylum including roundworms |
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Term
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Definition
| Phylum including insects, crabs, lobsters, barnacles, scorpions, spiders, and horseshoe crabs |
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Term
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Definition
| "Lungs" of terrestrial arthropods |
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Term
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Definition
| Light sensitive units that make up the compound eyes of insects and crustaceans |
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Term
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Definition
| Subphylum including centipedes and millipedes |
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Term
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Definition
| Class including centipedes |
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Term
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Definition
| Class including millipedes |
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Term
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Definition
| First pair of appendages located directly anterior to the mouth |
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Term
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Definition
| Sense organs in crustaceans that detect gravity |
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Term
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Definition
| The shield made of chitin and calcium salts that makes up the top and sides of crustaceans |
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Term
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Definition
| Tiny openings in the body walls of insects that allows air into the tracheal tubes |
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Term
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Definition
| Recieve metabolic waste from the blood and discharge them into the intestine. Insects have these. |
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Term
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Definition
| Immature stages between insect molts |
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