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| filter out food particles suspended in in the surrounding water as they draw it through their body, which in some species resembles a sac perforated with pores. (sponges) |
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| water is drawn through the pores into a central cavity called this |
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| After spongocoel, then flows out of sponge thru larger opening called this |
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| lining the interior of the spongocoel are flagellated choanocytes, ir collar cells |
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| body of sponges has two layers of cells separated by a gelatinous region called this. |
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| cells that use pseudopodia, take up food from surrounding water and from choanocytes, digest it, carry nutrients to other cells. |
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| each individual functions as both male and female in sexual reproduction by producing both gametes. |
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| central digestive compartment. part of basic body plan of cnidarian. |
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| cylindrical forms that adhere to the substrate by the aboral end of their body (end opposite of mouth) and extend tentacles waiting for prey. Compare to Medusa. |
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| resembles a flattened mouth-down version of polyp. moves freely in water by a combination of passive drifting and contractions of its bell-shaped body. Includes free-swimming jellies. |
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| tentacles of cnidarians are armed with batteries of this. cells unique to cnidarians that function in defense and prey capture. |
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| specialized cnidae that contain a stinging thread that can penetrate the body wall of the cnidarian's prey. |
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| flatworms. networks of tubules with ciliated structures called flame bulbs that pull fluid through branched ducts opening to the outside. |
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| best-known members of free-living rhabditophorans. commonly called this. |
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| rotifers have this in contrast to flatworms and cnidarians. a digestive tube with two openings, a mouth and anus. |
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| some species consist only of females that produce more females from unfertilized eggs, a type of asexual reproduction. |
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| colonial animals that superficially resemble clumps of moss. common name, byrozoans |
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| aka lamp shells. superficially resemble clams and other hinge-shelled molluscs, but the two halves of this shell are dorsal and ventral rather than lateral as in clams. all of these are marine. |
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| molluscs. part of body used for movement. muscular |
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| molluscs. part that contains most of the internal organs |
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| molluscs, part that is a fold of tissue that drapes over the visceral mass and secretes a shell, if one is present. |
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| molluscs, part where mantle extends beyond the visceral mass, producing a water-filled chamber called this. |
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| molluscs. part that is a strap-like organ used to scrape up food. |
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| shelled cephalopods called this. some as large as truck tires. dominant invert. predators of the seas for hundreds of millions of yrs until disappearance during the mass extinction at the end of the cretaceous period, 65.6 million yrs ago. |
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| "little rings" refers to the annelid body resembling a series of fused rings. |
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| marine species that recently has become a model organism for studying neurobio and development. |
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| ecdysozoans. shed a tough external coat called this. |
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| aka ecdysis. when ecdysozoans shed a tough external coat. |
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| segmented body. species. hard exoskel. jointed appendages. |
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| fluid called hemolymph is propelled by a heart through short arteries and then into spaces called sinuses surrounding the tissues and organs. |
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| 3 major lineages of arthroprod |
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Definition
chelicerates-sea spiders, horseshoe crabs, scorpions
myriapods- centipedes, millipedes
pancrustaceans- include insects, lobsters, shrimp, barnacles |
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| clawlike feeding appendages called this that serve as pincers or fangs. |
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| water scorpions. earliest chelicerates |
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| bulk of modern chelicerates are this. includes scorpions, spiders,ticks, and mites. |
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| gas exchange in spiders is carried out by this. stacked platelike structures contained in an internal chamber. |
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| grasshoppers, other insets, the young, called nymphs, resemble adults but smaller.with final molt, becomes sexually mature, reaches full size, has wings. |
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| larval stages specialized for eating and growing known by such names as caterpillar, maggot, or grub. larval stage looks entirely dif from adult stage, which is specialized for dispersal and reproduction. |
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| sea stars are a group of this. slow-moving or sessile marine animals. thin epidermis covers and endoskel of hard calcareous plates. |
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| unique to echinoderms. network of hydraulic canals branching into extensions. |
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| extensions of echinoderms. function in locomotion and feeding. |
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| bilaterally symmetrical coelomates with segmented bodies. |
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