Trilobites: Common Trilobites of North America

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The Foraminifera have tests that are usually constructed as a series of chambers of increasing size, with a main opening, or aperture, in the largest cham- ber from which the reticulopodia emerge. Invertbrates also include the Acanthocephala or spiny-headed worms, the Gnathostomulida, Micrognathozoa, and the Cycliophora. It is now generally agreed that no such segmentation occurs. Because of its high heat capacity, it is slow to heat up or cool down.

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Fauna of Australia

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As expected of invertebrate texts, both books spend most of their pages marching through taxa and provide critical chapters that unify themes throughout the text. Some adults and most juveniles with a pair of long tentacles, often retractable into sheaths 11. Leish- mania braziliensis is endemic to Brazil, where it causes espundia, or uta, which often leads to such severe destruction of the skin and associated tissues that complete erosion of the lips and gums ensues.

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Desert Channels: The Impulse to Conserve

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Interactions between germ cells and somatic cells in Drosophila melanogaster. The oddest ctenophores are members of the order Platyctenida. Although technically bilateral, the individual zooids of entoprocts have in many respects assumed a function- ally radial form. See Exporting Results for information on downloading results to, for example, Excel or Google Earth. ) in Grid View, or anywhere within the image frame in Gallery View. Members of the family Fecampiidae (Fecampia, Kronborgia, Glanduloderma) are parasites in marine crustaceans and certain polychaete worms.

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Neurohormones in Invertebrates (Society for Experimental

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They do not “waste” the silk of the old web, but eat it before or during the production of a new one. In keeping with their central role in phagocytosis and pinocytosis, cho- anocytes are highly vacuolated. Marine Fauna and Flora of Bermuda: A Systematic Guide to the Identification of Marine Organisms. The micronucleus of the macroga- mont divides twice (2–3) and the micronucleus of the microgamont divides three times (2–3).

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A Functional Anatomy of Invertebrates

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The oldest insect fossils date back to the Devonian period, about 416 million years ago. Taxonomic History and Classification Antony van Leeuwenhoek is generally credited with being the first person to report seeing protists, in about 1675. Sexual reproduction reported but not confirmed 8. Walking legs are present on the thorax and other appendages for swimming or reproduction are found on the abdomen. These very flexible animals can curl themselves into a tight ball when they are threatened or disturbed.

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Spiders of Australia: Interactive Identification to

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All hydrozoan cnidarians have a sexual phase in their life cycle (Figure 8.37). Symbiogenic origins of cnidarian cnidocysts. Oya and Weinstein [ 72 ] demonstrated that vitamin B12 is converted into metabolically active coenzyme from adenosylcobalamin in A. suum. Maccabeus is thought to use its ring of posterior cuticular spines for anchorage within its burrow (Figure 12.27D). The structure and function of compound eyes were reviewed in Chapter 15.

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Biology of the Invertebrates, Fourth Edition

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For example, the rigid and jointed exoskeleton of arthropods allows for a com- plex system of levers that results in very precise and re- stricted limb movements. Martinsson (ed.), Evolution and Morphology of the Trilobita, Trilobitoida and Merostomata. University of California Press, Berkeley, pp. 78–90. However, anatomical and developmental evidence suggests that these Malpighian tubules evolved independently in each of these groups, representing yet another exemplary case of convergent evolution among the Arthropoda.

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Australian Weevils (Coleoptera: Curculionoidea) I:

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Most other spiders have three pairs, although some have only one or two. Certain endosymbiotic naked species, including Entamoeba histolytica, produce cysts in which multiple fission takes place. The cellular mechanisms by which the prey chloroplasts are removed, sequestered, and cul- tured are not known. The posterior end of the worm extends from its tube. (D) Ripistes, an epibenthic, tube-dwelling member of the family Naididae.

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C. Elegans II: Monograph 33 (Cold Spring Harbor Monograph

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The water movement for feeding and respiration is more subtle, and it relies on the action of the cilia that cover the extensive ctenidia (gills) of most bivalves. The total living biomass of the world’s oceans is estimated to be about 2 × 109 tons of organic carbon (roughly 500 times the amount of organic carbon in the terrestrial environment). Furthermore, they are hermaphroditic, and most possess relatively complicated reproductive sys- tems.

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A Field Guide to the Shallow-water Echinoderms of the

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Medusas (also called jellies) are flattened, mouth-down versions of polyps that move by drifting passively and by contracting their bell-shaped bodies. Zool. 98: 529–625. [Faussek’s works include his views on the nephrocoel theory.] Frenzel, J. 1892. Work placement allows you to apply in a working environment the skills and knowledge you have gained on your course. Monoplacophorans share the character of a single- plate (univalve) shell with all other molluscs above the level of the polyplacophorans in the cladogram.

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