Category Archives: Invertebrates

A Guide to Common Singapore Spiders

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The two strands of the ventral nerve cord, as well as the segmental ganglia, are often largely fused. When they reach the alkaline medium of the small intestine, they break open and release trophozoites that are swept to the large intestine. Reproduction Ciliates have two types of nuclei in each cell. Range: Octopuses are found in every ocean of the world and along every coast of the United States. When they occur in sufficiently high concentrations, noxious or irritating chemicals can induce responses via this general chem- ical sensitivity.

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Queensland's Threatened Animals

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Selected References General References Edgecombe, G. As the anterior circular muscles contract and the longitudinal bands relax, the posterior edges of each involved segment are protruded as anchor points to prevent backward movement; the proboscis is thrust forward, deepening the burrow. Discussion - Provide a detailed explanation for how your animal of choice could have evolved over many generations from its more primitive form to its more complex modern form. Marshall (1992) describes a remarkable defen- sive behavior involving hairs in the tropical burrowing tarantula, Theraphosa leblondi.

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Marine Prosobranch Gastropods from Oceanic Islands off

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CLASS ASCIDIACEA: Ascidians, or sea squirts. Their tergites carry the same prefixes: pronotum, mesonotum, metanotum. For example, shells with low spires are more stable in areas of heavy wave shock or on vertical rock surfaces. The Cuvierian tubules are expelled by rupturing the hindgut, and this dramatic defensive ploy is almost always accompanied by the release of a soup of defensive chemicals that are likely to seriously impact, and potentially wipe out an enclosed tank.

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Spiders of China

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Upon protraction, the tentacles of the circular lophophores of stenolaemates and gymnolaemates are erected in a funnel or bell-shaped arrangement around the mouth (Figure 21.11A). Some of the ac- tive epibenthic forms utilize highly vascularized portions of the parapodia as gills. Many species are brightly colored, and compound ascideans frequently are some of the most colorful animals living on intertidal rocks. Species of Leishmania cause a variety of ailments collectively called leishma- niasis, and these include kala-azar (a visceral infection that particularly affects the spleen), oriental sore (char- acterized by skin boils), and several other skin and mu- cous membrane infections.

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A Guide to the Breeding Habits and Immature Stages of

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The extracel- lular food is drawn toward the cell body by cytoplasmic streaming, eventually enclosed within food vacuoles, and completely digested in the central portion of the cell. The moles are specimens of the European mole, Talpa europaea, which is found in Britain and Europe, as far east as Russia. In many herbivorous species (e.g., certain pulmonates and some opisthobranchs), a muscular gizzard may be present for grinding up tough vegetable matter.

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A Laboratory Manual of Invertebrate Zoology

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Fill out another page for one the amphibians you read about. Why the Classic Definition of “Open” and “Closed” Circulatory Systems Must Be Rethought? Dougherty (ed.), The Lower Metazoa: Comparative Biology and Phylogeny. More recently, Harbison (1985) also made a case for a triploblastic condition in ctenophores. Manning earned his BS (1956), MS (1959), and PhD (1963) from the University of Miami. Photo: Shadwick Lab Darren Irwin's lab is investigating migratory connectivity in populations of Wilson's warbler.

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Fresh Water Ecology: Bryozoa

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The arthropods have undergone a tremendous evolutionary radiation since then, and today they occur in virtually all environments on Earth, exploit- ing every imaginable lifestyle (Figure 15.1). The visceral mass is opened up, the foot is dissected, and most of the gills are cut away. (E) The common mussel, Mytilus, seen from the right side after removal of the right shell and the mantle. (F) Mytilus, with the vis- ceral mass opened up, the foot dissected, and most of the gills cut away. (A) Fused siphons PHYLUM MOLLUSCA 13UNCORRECTED PAGE PROOFS (Donacidae: e.g., Donax), venus clams (Veneridae: e.g., Chione, Dosinia, Pitar, Protothaca, Tivela), and the fresh- water families Sphaeriidae (e.g., Sphaerium) and Corbi- culidae (e.g., Corbicula).

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Low Temperature Biology of Insects

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Chelicerae are variously modified in different mite groups according to their varied feeding modes, which include grazing on fungi and bacteria, piercing plant cells and animal skin, or preying on other invertebrates. We also used the example of a Florida panther, mountain lion, cougar, & puma. The nervous system is characterized by 6 ganglia. Subsequent to their discovery in 1955, cephalocarids were regarded by most specialists as the most primitive living crustaceans, with the phyllopodous branchiopods and the leptostracans representing the most primitive members of the classes Branchiopoda and Malacostraca, respectively.

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The Financial Crisis Inquiry Report, Authorized Edition:

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Heule has lived in Edmonton his whole life. Such combinations of muscle contraction and relax- ation create a versatile movement system based on rela- tively simple principles. In lophophorates, this condition not only prevents fecal ac- cumulation in the encasement, but generally brings the anus close to rejection currents produced by the cilia on the lophophore. Can anyone tell me if there are any successful >Lobster maricultures out there?

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Systematics of Anopina Obraztsov (Lepidoptera Tortricidae:

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Neill (eds.), Encyclopedia of Reproduction, Vol. 13. The biology of pelagic shrimps in the ocean. One of the most striking features of arthropods is their segmentation and the complex way in which it is embryologically derived. Some unicellular forms develop complexly folded surfaces or are flat- tened or threadlike in shape. Archives available at http://www.vims.edu/~jeff/archive.htm =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= ------------------------------ Date: Tue, 19 Jan 1999 13:50:25 -0500 From: Jeffrey Shields Subject: CRUST-L: reference request: Green, J. 1961 (fwd) Please respond to Dale Tshudy and not to me.

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