Category Archives: Invertebrates

Insects of Eastern Hardwood Trees

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Adiyodi (eds.), Reproductive Biology of Invertebrates. Some other brittle stars suspension feed by using extended podia to form a trap; then the podia pass clumps of food to the mouth (Figure 22.9E). On the basis of such analyses, speci- mens are grouped into species (the word “species” is both singular and plural); related species are grouped into genera (singular, genus); related genera are grouped to form families; and so forth.

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Aquatic Oligochaetes: Proceedings of the 7th International

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The liquid silk produced by these glands is secreted into ducts through which it passes to the spinnerets (Figure 19.7). Support and Locomotion The shape of euglenids is maintained by a pellicle con- sisting of interlocking strips of protein lying beneath the cell membrane. The deeper water hexactinellid sponges often assume unusual shapes, Phylum Porifera: The Sponges Sponges have made no progress in the formation of an anterior end or a head.

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Blackflies (Simuliidae) (Simuliidae) (Fauna of the USSR.

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At periodic intervals, each animal withdraws its mucous sheet and swallows it, where- upon a new sheet is immediately constructed. American Fisheries Society Special Publication 26: 1-509. The most familiar raptorial polychaetes are hunting predators (e.g., many phyllodocids, syllids, and nereids). Figure 9.7 is a series of remarkable photographs showing the cydippid ctenophore Haeckelia eating the tentacles of the trachyline hydromedusa Aegina.

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Guide to INVERTEBRATE ANIMALS

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Larger epiben- thic ribbon worms and most of the burrowing forms employ peristaltic waves of the body wall muscles to propel them over moist surfaces or through soft substra- ta. However, sabellids, syllids, and some others can regrow the anterior end. Various ciliary tracts remove particu- late matter and direct it to the longitudinal groove on the radiole axis. The trend has been to centralize and con- centrate the major coordinating elements of the nervous system.

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Giant Tube Worms and Other Interesting Invertebrates

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Dragonflies and grasshoppers go through egg, nymph, and adult stages known as incomplete metamorphosis. We worked with a zoologist to make sure that each packet has the right balance of species for that group and that the set is truly representative of the diversity of the Natural World. Factors controlling the change in shape in certain nemertean and turbellarian worms. The Ediacaran epoch was followed by the Cambrian period and the great “explosion” of skeletonized metazoan life associ- ated with that time (see below).

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Reproduction of Marine Invertebrates

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One of our program animal keepers from the Good Zoo will bring a wild experience to your room or cottage as part of our in-room encounter programs. Examples of the major molluscan taxa appear in Figure 20.1. Origins of Sex: Three Billion Years of Genetic Recombination. Support and Locomotion Sipunculans are sedentary creatures. Rotifers have an alimentary canal, a digestive tract with a separate mouth and anus. In some classification schemes, Agnatha and Gnathostomata are considered superclasses, and in other schemes Agnatha is considered a class.

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Shrimp Aquaculture: Technology and Profitability, Global

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The arrows represent water currents. (H) (G) FPO slide here UNCORRECTED PAGE PROOFS OTHER DEUTEROSTOMES 861UNCORRECTED PAGE PROOFS (A) (B) (C) (D) (E) (F) Figure 23.15 General anatomy of ascidians. (A) A soli- tary ascidian (cutaway view). (B) The pharyngeal region of the same animal (cross section). But there are two other chordate subphyla, both of which lack vertebrae. Water is thus drawn into the chamber through the prosopyles, driven across the choanoderm, and then out the apopyle into the atrium or an excurrent canal.

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Nematoda (Handbook of Zoology)

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Phylum Microspora The 800 or so species of the phylum Microspora (Figure 5.47) are intracellular parasites occurring in nearly every phylum of animals; some are even found in other pro- tists, including gregarines and ciliates. Siphon size and burying depths in de- posit- and suspension-feeding benthic bivalves. Swallowing appears to be facilitated by a combination of ciliary action and the flow of water moving into the mouth and out the gill pores.

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The Physiology of Trematodes

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INTRODUCTION 21UNCORRECTED PAGE PROOFS Jablonski, D. 1986. Available: http://www.nhm.ac.uk/research-curation/research/projects/bombus/index.html. These animals are at a grade of complexity that may be called the tri- ploblastic acoelomate bilateria. Swarms of locusts can contain billions of individuals, and consume millions of tons of crops as they pass. Classifications are necessary for several reasons, not the least of which is to efficiently catalog the enormous number of species of organisms on Earth.

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Chironomidae Larvae, Volume 3: Biology and Ecology of the

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Sam was born in the United Kingdom and moved to Canada with his family in 2000 where, they settled in Edmonton. These late Cambrian–early Ordovician trilobites had vestigial mouthparts and large “gill filaments” (epipods) that might have been sites for bacterial cultivation. We may view intraspecific pheromones as coordi- nating the activities of populations, just as hormones help coordinate the activities of individual organisms. Many ciliates, especially predators, have specialized patches of sensory cilia that aid in finding prey, and even filter feeders use cilia lo- cated around the cytostome to “taste” and then accept or reject items as food.

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