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Category: Invertebrates

Evolutionary Developmental Biology of Invertebrates

Evolutionary Developmental Biology of Invertebrates

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Together, these bacteria and protists ap- pear to have formed diverse communities in shallow marine habitats during the Proterozoic eon. These in turn connect to the eight meridional canals, one beneath each comb row. Bonellia is also notable in its production of the green toxin bonellin, which probably has an antipredatory role. Sea Stars, Sea Urchins, and Allies: Echinoderms of Florida and the Caribbean.

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Acarorum Catalogus: Acariformes, Acaridida,

Acarorum Catalogus: Acariformes, Acaridida,

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Depending on one’s definition of “Crusta- cea,” it may even be that the first arthropods were them- selves crustaceans. Gas Exchange and Transport One of the principal functions of most circulatory fluids is to carry oxygen and carbon dioxide through the body and exchange these gases with the environment. Müller and Walossek’s work on the Swedish Orsten fauna indicates that the pentastomids had appeared as early as the Upper Cambrian, long before the land ver- tebrates had evolved.

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Catalogue of the Linyphiid Spiders of Northern Asia

Catalogue of the Linyphiid Spiders of Northern Asia

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The mouthparts of mites are small appendages called chelicerae, which end in pincers. After the insect collections were virtually destroyed in 1941, the subsequent proactive acquisition of specimens, especially over the last 25 years, has allowed us to assemble a regionally, nationally and internationally important collection. Echinoderm calcite: A mechanical analysis from lar- val spicules. Planktonic copepods were long thought to “filter” feed by generating lateral feeding gyres or currents by movements of the antennae and mouth appendages.

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Zoology Laboratory Studies (Invertebrate and Vertebrate)

Zoology Laboratory Studies (Invertebrate and Vertebrate)

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Notice the unequal distribution of body weight on the rest of the legs, indicated by the shadows of the “dimples” in the water surface; the weight is normally almost equally distributed when the spider rests on all eight legs. fpo copydot ordered ly at night. However, it avoids cold, heat and chemicals by backing up and moving away. January 2003. http://www.advancedaquarist.com/2003/1/inverts Toonen, R.

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Reproductive Biology of Invertebrates, Vol. 6, Pt. A,

Reproductive Biology of Invertebrates, Vol. 6, Pt. A,

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Times Mirror/Mosby College Publishing, NY. UNCORRECTED PAGE PROOFS to the ancestral line, next to character (1). Eye spots vary in complexity, ranging from very simple pigment spots to complex, lens-like structures. Long-term changes in structure and function of a tropical headwater stream following a disease-driven amphibian decline. This apparatus consists of ciliated cells called flame bulbs that waft fluid through branched ducts that open to the outside.

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Eight-Legged Marvels: Beauty and Design in the World of

Eight-Legged Marvels: Beauty and Design in the World of

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Cnidocytes are found only in the epidermis and germ cells arise in the gastrodermis but may, or may not, migrate to the epidermis to form gonads and mature into gametes. On days 5 & 6 of creation, God created each animal after its own kind. The changes in color from red to red-orange to blue-green reflects the change to an acid condition within the food vacuole and thus the initial stage of the digestive process.

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The Freshwater Mussels of Ohio

The Freshwater Mussels of Ohio

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Zool. 25(1): 155–284. [12 papers devoted to work on the crustacean endocrine system.] Anderson, D. Some of the detailed researches on nematodes have indicated changes and differentiation in the pseudocoelomocytes during postembryonic development. There is no need to quibble over the word recapitulation; either the usage of the word should be altered to include any type of ances- tral reminiscence during ontogeny, or some new term should be invented. However, a few of the principal ones are noted below.

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Thrips (Naturalists' Handbooks)

Thrips (Naturalists' Handbooks)

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Precipitated nitro- genous material and other particulate wastes are 24 CHAPTER TWENTY-TWOUNCORRECTED PAGE PROOFS phagocytosed by certain coelomocytes in the body fluids and then discharged by various methods. The apical complex apparently attaches the parasite to a host cell and releases a substance that causes the host cell membrane to invaginate and draw the parasite into its cytoplasm in a vacuole. Gut ultrastructure and digestive physiology of two marine nematodes, Chromadorina germanica (Butschli, 1874) and Diplolaimella sp.

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Sasol First Field Guide to Spiders & Scorpions of Southern

Sasol First Field Guide to Spiders & Scorpions of Southern

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These discoveries, combined with the dynamic and toti- potent nature of sponge cells, makes succinct classifica- tion of their cells difficult. It is during these intermolt stages that real tissue growth occurs, although with no increase in external size. Water temperature, light, phytoplankton abun- 86 CHAPTER THREEUNCORRECTED PAGE PROOFS Figure 3.35 A generalized metazoan life cycle. *In thinking of animals, we typically view “sex” and “reproduc- tion” as one in the same. These calciferous glands remove calcium from ingested material.

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The Invertebrates: A New Synthesis

The Invertebrates: A New Synthesis

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Stick and leaf insects, specters, and other phasmids are some of the oddest of all the insects. Compare and contrast platyhelminths and mesozoans. In cephalopods the foot is modified to form the funnel (= siphon) and at least parts of the arms. (A) (C)(B) (D) (G) UNCORRECTED PAGE PROOFS PHYLUM MOLLUSCA 19 papillae or other receptors. In September 2014, the then 2200 Cornell drawers-large insect collection was moved into the new Avenir Collection Center, a newly build state-of-the-art collections facility, climate-controlled and furnished with purpose-built steel cabinets of the highest quality.

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