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Definition
| individual contains both male and female sexual structures |
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| in an annelid, bristles of chitin that help anchor the worm during locomotion or when it is in its burrow |
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Term
Tracheae/tracheoles/spiracles |
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Definition
| a tube for breathing in terrestrial vertebrates carries air between the larynx and bronchi/ the smallest branches of the respiratory system of terrestrial arthropods/ external opening of a trachea in arthropods |
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| rasping tongue found in most mollusks |
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| a thickened band on an earthworms body; the mucus it secretes hold the worms together during copulation |
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| function as excretory organs; blind tubules opening into the hindgut of terrestrial arthropods; designed to conserve water; take nitrogenous waste and change it to adapt; equivalent to flame cells |
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| the inner layer of a mollusk that increases in thickness; this is when it reaches sufficient thickness |
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| a horse-shoe shaped crown of ciliated tentacles that surrounds the mouth of certain spiralian animals |
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| a larval form characteristic of crustaceans |
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| a specialized type of free-living larva found in lophotrochozoans |
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Definition
| an external skeleton; in arthropods |
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Definition
| process in which a marked change in form takes place during postembryonic development as, for example, from tadpole to frog |
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| the soft, outermost layer of the body wall in mollusks; the mantle secretes the shell |
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Definition
| shedding the outer, cuticular layer; molting |
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| one of the distinguishing features of chordates running lengthwise just beneath the embryo’s dorsal surface |
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| the intermost of the extraembryonic membranes; forms a fluid filled sac around the embryo in amniotic eggs |
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| mammal in which the young are born early in their development and retained in a pouch |
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Definition
| in chordates, a dorsal rod of cartilage that forms the primitive axial skeleton |
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Term
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Definition
| cartilaginous fishes are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made or cartilage rather than bone. |
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| a membrane of the embryonic egg that functions in respiration and excretion in birds and reptiles and plays an important role in the development of the placenta in most mammals |
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| Characteristic of chordates, pharyngeal slits are openings through which water is taken into the pharynx, or throat |
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| extinct armored fish; earliest branch of the jawed fishes |
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Definition
| a vertebrate that produces an egg surrounded by four membranes, one of which in the amnion; reptiles, birds and mammals |
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Definition
| aids in propelling food into the digestive tract; a muscular structure lying posterior to the mouth |
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Definition
| organ only in bony fish that helps to regulate its buoyancy by increasing and decreasing the amount of gas in the bladder |
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Definition
| animals who’s body temp. is regulated by behavior or surroundings |
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Term
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Definition
| maintaining a constant body temp. |
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| an egg that is isolated and protected from the environment by a more or less impervious shell during the period of its development |
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Definition
| the outer member of the double membrane that surrounds the embryo of reptiles, birds and mammals; contributes to the structure of the placenta |
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| a tissue formed in part from the inner lining of the uterus and in part from other membranes; nourished the embryo |
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Definition
| The hole in a lancelet through which water exits the body |
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Definition
| veins are vessels that bring blood to the heart. There are four pulmonary veins which extend from the left atrium to the lungs |
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| any member of a major order (Therapsida) of reptiles of Permian and Triassic time (from 286 to 208 million years ago). Therapsids were the stock that gave rise to mammals |
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| An organism, such as a mammal or bird, having a body temperature that is constant and largely independent of the temperature of its surroundings; an endotherm. |
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| means upright; early ancestors of Homo Sapiens |
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| the last species to diverge from the human line prior to the emergence of modern humans, and the last species of hominid to have gone extinct |
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| mammilian species; humans |
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| include all animals having a skull (or cranium, hence their name), be it cartilaginous or bony |
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| An organism, such as a fish or reptile, having a body temperature that varies with the temperature of its surroundings; an ectotherm. |
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| situation in which all teeth are basically the same in structure, although they may differ in size, as is found in reptiles |
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| the main body of a vertebra |
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| standing, or moving, on two legs |
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