Category Archives: Invertebrates

Particles on Surfaces: Detection, Adhesion and Removal,

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A polarity exists from anterior to posterior, with rear segments generally being more easily regrown than front ones. Professional life is a real mosaic of activities - talking with students, debating issues with colleagues, laboratory work and field work. The fall of the Austro-Hungarian monarchy went hand in hand with decisive changes for the former Imperial Court Museum. The prehensile antennules and hooked labrum of the y-cyprids suggest that the adults are parasitic.

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Zoology Coloring Book: Coloring Books for Kids (Art Book

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Transport of dissolved amino acids by the mussel, Mytilus edulis: Demonstration of net uptake from natural seawater. Approximately two-thirds of the described species of euglenids lack chloroplasts and are thus obligate het- erotrophs, and even phototrophic forms can lose their chloroplasts and switch to heterotrophy. The diversity of form in this group is staggering, and at first glance it may be difficult to imagine diatoms and kelp being closely related. In the 19th century, the collections grew prodigiously through collections compiled by expeditions, explorers, gifts as well as through purchases.

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Ancient Animals, New Challenges: Developments in Sponge

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This disclaimer is neces- sary because protist “meiosis” is more variable than that seen in animals, and it is certainly less well understood. An undescribed species of Prosthiostomum (Polycladida) is a parasite on the Hawaiian coral Mon- tipora (Jokiel and Townsley 1974). It appears that the blood is separate from the coelomic fluid, al- though both contain certain similar cells. As in the Hexapoda, there are just four pairs of cephalic appendages: antennae, mandibles, first maxillae, and second maxillae.

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Enhancing Biological Control: Habitat Management to Promote

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Symbioses Commensalism is common among sponges of all kinds. Because the cuticle is secreted by the cells of epidermis, it often bears their impressions in the form of microscopic geometric patterns. Another unique animal is the elysia chlorotica. Science 239: 748–753. [Also see responses in Science 243: 548–551.] Field, K. In general, eggs are produced by adult worms in their definitive host. Asexual production of planulae in the coral Pocillopora damicornis. Onto- genetically, the metacoel is an uninterrupted cavity with only one, midventral, mesentery.

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Myxozoan Evolution, Ecology and Development

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BLASTOCOELOMATES AND OTHER PHYLA 385UNCORRECTED PAGE PROOFS Ax, P. 1985. Place a couple drops of pond water on a microscope slide. Body Wall, Support, and Locomotion The nematode body is covered by a well developed and complexly layered cuticle secreted by the epidermis (Figure 12.16D). Actual food collection in most sand dollars is accom- plished by podia on the oral surface. Fertilization is exter- nal but often occurs in the mantle cavity of the female.

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A Basic Glossary of Invertebrate Zoology

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Toothpick Worms - The objective of this lesson is to let students experience the role of color in camouflage. The dense dermis fills the areas between the muscle bands. In other cases, two adja- cent dicondylic limb joints articulate at 90 degrees to one another, forming a gimbal-like arrangement that fa- cilitates movement in two opposing planes. Pearse (eds.), Reproduction of Marine Invertebrates, Vol. 1, Acoelomate and Pseudocoelomate Metazoans. Krista's recent involvement in Alberta Peatland reclamation projects has brought her research closer to home and she is excited to continue to develop her taxonomic skills with the Alberta bryophytes in her new role at the Royal Alberta Museum.

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3-D Zoology Charts 9.25" x 12.75". Grades 4+. Ages 9+.

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The anterior part of the gut dif- ferentiates as the pharyngeal basket during larval life, and the rudiment of a cloacal water cavity forms by an ectodermal invagination producing the atrial siphon. The numerical superiority of arthropods is not a re- cent event. Skeletal ossicles and juvenile podia are present. ORDER CESTIDA: Figures 9.1C, 9.2I) Pelagic; body ex- tremely compressed in tentacular plane, and greatly elongat- ed in stomodeal plane, producing a ribbon-like form up to 1 m long in some species; substomodeal comb rows elongated, ex- tending along entire aboral edge; subtentacular meridional canals arise under subtentacular comb rows (Cestum) or equa- torially from interradial canals (Velamen); paragastric canals ex- tend along oral edge and fuse with meridional canals; tenta- cles and tentacle sheaths present.

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Invertebrate Zoology: A Functional Evolutionary Approach

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The discovery of the gigantic vestimentiferans associated with hydrothermal vents further complicated the con- troversies surrounding these animals. The exploitation of similar habitats by animals with different phylogenetic histories is frequently ac- companied by the appearance of convergent similarities. Ever wonder what the difference between a frog and a toad was? There are two subtypes of diaplectic metachrony. Non-Molluscan Invertebrates - Only the specimen records that are not Molluscan lots.

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Biology of the Acanthocephala

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Here we briefly summarize the ways in which these feeding behaviors are em- ployed by molluscs. The tentacles also arise from deep epidermal pockets that resemble the tentacle PHYLUM CTENOPHORA: THE COMB JELLIES 281 Figure 9.10 A typical young cydippid larva. *Komai (1922, 1963) reported the presence of a brief “planula” stage in the development of the parasitic cydippid Gastrodes para- siticum, which was said to burrow into the test of host salps, where it then developed into a free-swimming cydippid.

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Chemotherapeutic Targets in Parasites: Contemporary

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Dahl independently pro- posed that the copepods and several related classes constitute a monophyletic clade. The second theory suggests that the actin–myosin interaction takes place at the rear of the cell, where it produces a contraction of the ectoplasm. At the IINH, complex research on land invertebrates is carried out. Mucous gland cells occur in the epidermis of at least some species. The coelenteron or gastrovascular cavity occupies the central region of the umbrella and extends radially via radial canals.

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