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CHAPTER 10 Invertebrates
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ward from their bodies The jelly sh with its many radiating arms, of course, is a typical radiolarian In these animals, there is no head or rear end, nor left or right side They do not show the characteristic of cephalization There is, however, both a superior (soo-PEER-e-or) portion of the animal lying above (superi) most of the body, and an inferior (in-FEER-e-or) portion lying below (inferi) (Go back and review Figure 102 to see these terms of relative body position)
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PRESENCE OF GERM LAYERS WITHIN THE EMBRYO
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In sponges (the parazoans), there are no tissues, so the embryo does not form cell layers during its body development In all animals except sponges, however, there are two or more germ layers rings of cells within the embryo from which specialized tissues and organs are produced The germ layers are created in several stages during the maturing of a zygote after fertilization (Figure 103) After several cleavages (successive cell divisions by mitosis), an eight-cell stage is followed by a blastula (BLAS-tyoo-lah), a hollow little bladder -like ball of cells The central cavity within the middle of the blastula is called the blastocele (BLAS-toh-seal) Following the blastula is a gastrula (GAS-true-lah) The gastrula is literally a little stomach (gastrul) or hollow ball of several layers of germ cells It is these germ cells (or germ layers) that eventually give rise to the specialized tissues in the later embryo and, nally, the adult stages of life The gastrula is created by an infolding of the layer of surface cells around the blastula This infolding creates another cavity, called the archenteron (ark-EN-ter-ahn) the beginning (arch) form of the intestine (enteron) The archenteron (like the mature intestine) is connected to the surface by an opening Around the archenteron is the endoderm (EN-doh-derm) The endoderm is an inner (endo-) skin (derm) of germ cells from which the lining of the intestine and interior of other major body cavities, eventually develops An ectoderm (EK-toh-derm) outer (ecto-) skin covers the surface of the embryo The ectoderm ultimately gives rise to the skin and the central nervous systems of many types of animals Finally, most eumetazoans have a third germ layer, the mesoderm (ME-soh-derm) or middle skin, sandwiched in between the endoderm and the ectoderm The mesoderm forms the muscles and most other organs Various radiolarians besides the jelly sh such as the hydras (HIGHdrahs), sea anemones (ah-NEM-oh-nees), and coral animals lack a meso-
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PART 3 Five Kingdoms of Life, plus Viruses
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derm But they still have the other two germ layers, the endoderm and ectoderm, from which all of their adult tissues eventually develop
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ZYGOTE
8-CELL STAGE
BLASTULA ( little bladder )
Cross section through blastula Infolding
Blastocoel (cavity)
THE THREE GERM LAYERS
Ectoderm ( outer skin ) Mesoderm ( middle skin ) Endoderm ( inner skin )
GASTRULA ( little stomach ) Archenteron (beginning of intestine)
Fig 103 The three germ layers in the embryo
Coelom or No Coelom: Body Cavities in the Bilateria
Having discussed the sponges (parazoans) without tissues, as well as the radiolarians (eumetazoans with tissues and radial symmetry), we will now focus exclusively upon the bilateria Remember that the bilateria are eumetazoans with true body tissues, as well as mature bodies that have the form of bilateral symmetry These mature bodies grow from embryos having all three germ layers
CHAPTER 10 Invertebrates ACOELOMATES: NO MAIN BODY CAVITY
The previous section told us that in all animals except sponges, there is an archenteron present in the embryo This archenteron is a hollow tube essentially representing the beginning structure of the digestive tract All animals must have such a digestive tract, because they are heterotrophs consuming food which provides them with needed energy Since metabolism is never 100% e cient, some of the ingested food matter is excreted through the anus (AY-nus) as feces A further way of classifying the bilateral invertebrates can now be considered It is the answer to the following question: Does the animal s body contain a coelom (SEE-loam) central body cavity around its archentereon (digestive tract), or not The additional way of classifying animals thus becomes one of distinguishing the coelomates (SEE-luh-mates) from the acoelomates (ay-SEE-luhmates) The coelomates, quite obviously, are those bilateral invertebrates whose bodies contain a coelom (central cavity), whereas the acoelomates have no central body cavity The distinction becomes clear when one examines Figure 104 The acoelomates are generally considered the more primitive or most ancient organisms (according to the Fossil Record) Representative of the acoelomates are the planaria (plah-NAIR-ee-uh) The planaria are free-swimming atworms that have a solid body (containing no coelom around their digestive tube) The planaria are carnivores They catch and eat smaller animals, and feed on dead organisms in the water The planaria have amazing powers of regeneration This means that they are able to re-grow large portions of their bodies when they are cut o and removed This trait has made them a valuable research tool for biologists seeking to learn how to promote regeneration of lost or damaged human body parts [Study suggestion: Compare the name planaria with similar words like plantar and plaintain ( 10) From a look at Figure 104 (A), after what speci c characteristic is the planaria worm named ] Midway between the acoelomates and the coelomates is a very large group of invertebrates called the pseudocoelomates (SOO-doh-see-luh-mates) This group is so large because it contains over 90,000 known species of nematodes (NEM-ah-toads) Nematodes are slender, thread (nemat)- shaped (-ode) worms The nematodes (threadworms) are alternately called the roundworms But their bodies tend to be narrow and cylinder-shaped, and they are often tapered at either end (Figure 104, B) The nematodes (roundworms, threadworms) are classi ed as pseudocoelomates because their bodies contain a false (pseudo-) cavity (coelom)
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