Term
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Definition
| holds the ocular in place. |
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Term
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Definition
| at the bottom of the tube is the revolving nose piece. A turret-like mechanism rotates so that different lenses can be selected. |
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Term
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Definition
| each of the lens sets attached to the revolving nose piece is an objective. |
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Term
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Definition
| determined by multiplying the power of the ocular by the power of the objective in use. |
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Term
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Definition
| platform just below the objective |
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Term
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Definition
| light intensity may be adjusted by rotating the disk diaphragm just below the stage |
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Term
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Definition
| the entire upper assembly of the microscope is held in an upright position by a bar called the arm |
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Term
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Definition
| adjust the distance greatly between the stage & objective |
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Term
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Definition
| adjust the distance very little between the stage & objective |
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Term
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Definition
| consist of a variety of organisms such as diatoms, dinoflagelates, & some crustaceans which spend their entire lives as plankton (holoplankton). |
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Term
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Definition
| organisms that are planktonic for only a part of their life cycles |
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Term
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Definition
| comprised of free floating algae of the sea that are capable of photosynthesis. |
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Term
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Definition
| various free floating animals and animal larva. |
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Term
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Definition
| commonly called the ragworm, clamworm, or sandworm. |
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Term
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Definition
| on the head with an abundance of sense organs. at the extreme anterior end. |
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Term
| Prostomium (Nereis virens) |
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Definition
| dorsal, anterior of head. several anterior segments have fused. bears a pair of small, short antennae either on its side or midline. |
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Term
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Definition
| fleshy. extends anterolaterally & slightly ventrally from the sides of the prostomium. |
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Term
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Definition
| 4, black or reddish, located on the posterior dorsal surface of the prostomium. |
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Term
| Peristomium (Nereis virens) |
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Definition
| a complete ring immediately posterior to the prostomium, completely encircles the mouth. |
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Term
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Definition
| 4 pairs, long whip-like, tentacular. |
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Term
| Parapodia (Nereis virens) |
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Definition
| paired, lateral, bear fleshy lobes with bristle-like setae. |
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Term
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Definition
| A typical parapodium is composed of 2 major branches, or rami, and accordingly is said to be biramous. |
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Term
| Notopodium (Nereis virens) |
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Definition
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Term
| Neuropodium (Nereis virens) |
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Definition
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Term
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Definition
| each ramus bears clusters of chitinous setae which look like bristles called chaetae. |
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Term
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Definition
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Term
| Living Fossil (Horseshoe Crab) |
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Definition
| todays horshoe crabs closely resemble those from early fossils |
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Term
| Cephalothorax (Horseshoe Crab) |
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Definition
| the anterior tagmata, large, shieldlike |
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Term
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Definition
| posterior to the cephalothorax, short |
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Term
| Tail Spine (Horseshoe Crab) |
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Definition
| spikelike, telson, extends posterior from the abdomen |
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Term
| Tail Spine (Horseshoe Crab) |
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Definition
| spikelike, telson, extends posterior from the abdomen |
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Term
| Exoskeleton (Horseshoe Crab) |
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Definition
| the body is completely covered by an extracellular cuticle |
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Term
| Carapace (Horseshoe Crab) |
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Definition
| the dorsal skeleton of the cephalothorax, strongly convex |
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Term
| Median Ridge (Horseshoe Crab) |
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Definition
| on the midline of the carapace, bear small teeth |
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Term
| Lateral Ridge (Horseshoe Crab) |
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Definition
| on both sides of the carapace, bear small teeth |
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Term
| Compound Eyes (Horseshoe Crab) |
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Definition
| the carapace bears a pair of lateral compound eyes & 2 major anterior median ocelli. |
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Term
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Definition
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Term
| Chelicerae (Horseshoe Crab) |
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Definition
| the anterior most appendages are the characteristic chelicerae of chelicerate arthropods. relatively small, end with a pincer, or chela. |
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Term
| Book Gills (Horseshoe Crab) |
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Definition
| 5 distinct pairs, look like pages of a book. |
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Term
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Definition
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Term
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Definition
| the attached, basal end of the column which terminates the pedal disc. |
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Term
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Definition
| the opposite end is free in the water and is the oral end terminating in the oral disc. |
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Term
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Definition
| Whorls of unbranched tentacles encircle the margin of the oral disc. |
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Term
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Definition
| elongate slit on the center of the oral disc. |
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Term
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Definition
| many anemone form a symbiosis with certain single-celled green algae species which reside in the animals gastrodermal cells. |
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Term
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Definition
| the aggregating anemone reproduces asexually by fission and forms large clonal groups of smaller individuals. |
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Term
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Definition
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Term
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Definition
| the body consists of a large, relatively flat disc called the bell due to its bell-like shape (in-life) or umbrella-like shape with the mouthparts hanging below it. |
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Term
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Definition
| The lower or oral surface of the bell bears the mouth and is the subumbrella. |
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Term
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Definition
| The lower or oral surface of the bell bears the mouth and is the subumbrella. |
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Term
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Definition
| opposite of the subumbrella, aboral, surface is the exumbrella. |
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Term
| Oral-aboral Axis (Moon Jelly) |
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Definition
| extends from the center of the aboral surface to the center of the oral surface and is the axis of symmetry. |
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Term
| Radial Symmetry (Moon Jelly) |
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Definition
| of cnidarians is around the axis |
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Term
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Definition
| 4 long, lacy, of the manubrium. oriented at right angles to each other and form a conspicuous "X" across the oral surface. |
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Term
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Definition
| the grooves of the 4 oral arms meet at the mouth in the center of the oral surface. the margins of the grooves bear small brachial tentacles. |
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Term
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Definition
| the 4 oral arms radiate outward from the short, inconspicuous vertical column called the manubrium attached to the center of the oral surface. |
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Term
| Marginal Tentacles (Moon Jelly) |
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Definition
| short, numerous, margin of the bell, bear cnidocytes containing oval nematocysts within them. |
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Term
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Definition
| embryos develop into a free-swimming larval stage called the planula that settles to the bottom & develops into the scyphistoma. |
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Term
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Definition
| develops from the planula, develops into a strobila that buds off many tiny ephyra that later develop into the familiar jellyfish form of the medusa. |
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Term
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Definition
| egg > planula > scyphistoma > budding strobila > ephyra > medusa |
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Term
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Definition
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Term
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Definition
| tubular, verntal to the head |
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Term
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Definition
| thick muscular walls, enclose the large mantle cavity and the visceral mass |
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Term
| Lateral Fins (Brief Squid) |
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Definition
| the pointed apex of the hump is the posterior end of the animal and it bears a pair of lateral fins |
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Term
| Skirt (or collar) (Brief Squid) |
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Definition
| the free anterior margin of the mantle |
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Term
| Exhalant Siphon (Brief Squid) |
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Definition
| below the head on the ventral midline, water exits the mantle cavity |
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Term
| Inhalant Siphon (Brief Squid) |
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Definition
| water enters the mantle cavity via 2 lateral inhalant siphons between the mantle & funnel |
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Term
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Definition
| 8 of their appendages are relatively short arms, & 2 are much longer tentacles. |
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Term
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Definition
| a tentacle that bears 4 rows of suckers, much longer than any arm, contractile, used to capture food |
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