I Wonder What It's Like to Be a Spider (Life Science Wonder

Erin M Hovanec

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It has only been in the last 30 years or so that the physiological and adaptive nature of this relationship has been described to any extent. Small to moderate in size; primarily bathylpelag- ic; some contain zooxanthellae. (e.g., Atolla, Linuche, Nausithoe, Periphylla, Stephanoscyphus, Tetraplatia) ORDER SEMAEOSTOMAE: Corners of mouth drawn out into four broad, gelatinous, frilly lobes; stomach with gas- tric filaments; hollow marginal tentacles contain extensions of radial canals; without coronal furrow or pedalia; gonads on folds of gastrodermis.

Root-knot Nematodes (Cabi)

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Development into sexually mature adult scyphomedusae takes a few months to a few years, depending on the species. Other interpretations of molluscan phylogeny exist, of course. Ephyrae are very small animals with characteristical- ly incised bell margins (Figure 8.40C). The main longitudinal nerve cords arise from the ventral lobes of the cerebral gan- glion and pass posteriorly; they attach to each other at various points by branched transverse connectives and terminally by an anal commissure.

Marine Shells of the Whitsunday Coast and Islands

A. G. Jarrett

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Re- cent data from paleontology, comparative anatomy, and molecular phylogenetics suggest that the Diplura may be closer to the Insecta than to Collembola–Protura. Once contact with a substratum is made, a larva tests it to determine its suitability as a habi- tat. ORDER NUCULIDA (= PALAEOTAXODONTA): Shell aragonitic, interior nacreous or porcelaneous; perios- tracum smooth; shell valves equal and taxodont (i.e., the valves have a row of short teeth along hinge mar- gin); adductor muscles equal in size; with large palp proboscides used for food collection; ctenidia small, strictly for gas exchange; foot longitudinally grooved and with a plantar sole, adults without byssal threads; nervous system primitive, often with incomplete union of cerebral and pleural ganglia; marine, mainly infau- nal detritivores. (e.g., Malletia, Nucula, Yoldia) ORDER SOLEMYIDA (= CRYPTODONTA): Shell valves thin, elongate, and equal in size; uncalcified along outer edges, without hinge teeth; anterior ad- ductor muscle larger than posterior one; ctenidia large, used both for gas exchange and feeding. (e.g., Solemya) SUBCLASS LAMELLIBRANCHIA: Paired ctenidia, with very long filaments that fold back on themselves so that each row of filaments forms two lamellae; adjacent filaments usu- ally attached to one another by ciliary tufts (filibranch con- dition), or by tissue bridges (eulamellibranch condition).

Pollution Ecology of Freshwater Invertebrates (Water

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Now we appreciate them for their abilities as escape artists, with sophisticated camouflage systems and ink jets?as well as their roles in tasty dishes from many cuisines. No. 16, Academic Press, London. [A benchmark publication with major papers by most specialists on the subject of cnidarian evolution.] Russell, F. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

Molecular and Physiological Basis of Nematode Survival

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The fully formed actinotroch bears a preoral hood, or lobe, over the mouth. Stoneflies (Plecoptera) of eastern North America. They extract food particles, mostly phytoplankton, from currents pro- duced by the lateral cilia on the tentacles (Figure 12.32B). Jean-Baptiste Lamarck, who was appointed to the position of "Curator of Insecta and Vermes" at the Muséum National d'Histoire Naturelle in 1793, both coined the term "invertebrate" to describe such animals, and divided the original two groups into ten, by splitting Arachnida and Crustacea from the Linnean Insecta, and Mollusca, Annelida, Cirripedia, Radiata, Coelenterata and Infusoria from the Linnean Vermes.

Catalog of Recent Type Specimens in the Division of

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The working principle: Sugarcane is different from. correlated with the washing machine working principle. Stoneflies, like mayflies, have experienced consider- able evolutionary radiation of the larval (nymphal) stage. Eventually, the cilia and the cell boundaries between adjacent somatic cells are lost (Fig- ure 7.6F), and the animal develops into another vermi- form adult. Larvae are legless, usually soft, white, and grublike. A three-taxon data set has 3 possible dichotomous (all lines divide into just two branches) trees that explain it.

Lecture Notes on Invertebrate Zoology

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Thesis (Plan A) and non-thesis (Plan B) programs leading to the MS degree in zoology are available. Mason, an avid collector with a wealth of contacts in the lepidopterist community and Museum manager from 1900-1910, donated a worldwide collection of 20,000 butterflies and moths to the Museum in 1918. In asteroids, waste-laden coelomocytes accumulate in the papulae, which then pinch off their distal ends, expelling the cells and waste material. Nuclei either ovular or vesicular; many are multinu- cleate; some exhibit nuclear dualism 5.

Respiration in the Invertebrates (Macmillan studies in

P.J. Mill

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For many, the relation- ship with their host is a loose one, the polychaete often using the host merely as a protective refuge. The female reproductive system is more variable than that of the male. The larvae eat the roots of palo verde trees in the Sonoran Desert. An invertebrate is an animal that has no spine, or backbone. 2. Some oysters are sus- pected of this feeding strategy, at least on a part-time basis. In addition, when Martinson and coworkers fed Chrysomela confluens larvae to ants, the larvae that had eaten resprouts survived longer than the larvae that had eaten normal sprouts.

Area-Wide Control of Insect Pests: From Research to Field

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They are carried on short stalks, lack a lens, and are open to the water through the pupil. Undergrads can pursue herp research via independent study with faculty. More remarkable is that Portia often tries various vibra- tion patterns on a web, and when a successful one is found, continues to use only that one on the webs of the same prey species in the future. Combine science and art through simple art projects related to vertebrates and invertebrates.

The physiology of trematodes (University reviews in biology,

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The first 3 exams are 100 points each and are based on the current unit. In some it is by fragmenta- tion at one or several points along the body, followed by regeneration of each fragment to a new worm. Hydroids and hydromedusae of marine, brack- ish, and fresh water basins of the U. They move by a rippling motion of their foot or by means of cilia. Because scientific name of an insect functions as a key to the literature about it, accurate identification is of paramount importance.