Category Archives: Invertebrates

Atlas of Australian Termites

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Pumice from volcanic eruptions and slag from steamships turned out to be characteristic for benthic samples from the Eastern Mediterranean. At night, these signals increase the eyes’ sensitivity to light up to a million times over the daytime levels. In at least one hy- dromedusa (Aequorea), luminescence appears not to be the result of the usual luciferin-luciferase reaction. Protists are like plants or animals in that some make their own food and some don't.

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Molecular and Physiological Basis of Nematode Survival

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New Carboniferous Diplura, Monura, and Thysanura, the hexapod ground plan, and the role of thoracic side lobes in the origin of wings (Insecta). Expression of spatially regu- lated genes in the sea urchin embryo. Ng & Celio Magalhaes >Dear Colleagues: >I am trying to get in touch with Peter K. The Early Cambrian radiation of arthropods. Signor (eds.), Origin and Early Evolution of the Metazoa. Harvard University Press, Cambridge, MA. [A scholarly coverage of ideas concerning re- capitulation and other interactions between development and evo- lution.] Grell, K.

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Biology of the Invertebrates, Fifth Edition

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The classification scheme below draws from various authors. Usually the cells of the blastula divide such that the cleavage planes are perpendicular to the surface of the embryo. Members of this group include crustaceans, insects, scorpions, horseshoe crabs, centipedes, mites, millipedes, and spiders. Three protist phyla (ciliates, api- complexans, and dinoflagellates) have an alveolar membrane system, which comprises flattened mem- brane-bound sacs (alveoli) lying beneath the outer cell membrane.

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Biological Effects by Organotins

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They can be easily seen by observing a crab or lobster in quiet water. Born in Ontario, Hilary spent her childhood summers searching for insects in the Muskokas and raising many caterpillars, amphibians, and reptiles. In general it is weakly developed com- pared with that of enteropneusts—a condition not unex- pected in tiny animals. Antennal glands are sometimes called “green glands.” Most crustaceans have only one pair of these nephridial organs, but lophogastrids and mysids have both antennal and maxillary glands, and a few others (cephalocarids and a few tanaids and isopods) have well developed maxillary and rudimentary antennal glands.

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Living Invertebrates

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Size: There is tremendous range in the size of octopus species found in U. Although they are not usually an obvious presence on most coral reefs, apodid sea cucumbers are a common member of virtually all coral reefs throughout the Caribbean and Indo-Pacific. Ophiuroids do not have an anus, so waste is eliminated through their mouth. Hydra consists of an elongate column inside of which is the coelenteron Fig 1, 7-57*). They are colorless, have very thin cuticles, and have lost the circulatory and gas exchange organs.

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Titan

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Osmoregulators, such as a number of estuarine ne- reids, often have thicker body walls that tend to resist changes in shape and volume. Gonochoristic or hermaphroditic; development variable. As explained in Chapter 15, tracheae are extensive tubular invaginations of the body wall, open- ing through the cuticle by pores called spiracles. These ac- tivities are further enhanced by the absence of linings and partitions within the body cavity, so the exchanges occur directly between the organ tissues and the body fluid.

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Identifying British Insects and Arachnids: An Annotated

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Like all flatworms, acoels undergo a complex embryon- ic development; nothing of this sort occurs in ciliates. New aspects of acanthocepha- lan lacunar system as revealed in anatomical modeling by corro- sion cast method. Mucous feeding nets are secreted through the mouth and lie within the house chamber. Mesoderm and body cavities form by enterocoely. Current opinion holds these animals to be large, solitary, athecate hydranth polyps floating upside down at the surface instead of sitting on a stalk attached to the bottom.

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Handbook of Genetics: Plants, Plant Viruses, and Protists

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Pedicellariae were discovered in 1778 by O. In steno- podous limbs, the same limb bud subdivisions end up PHYLUM ARTHROPODA: THE CRUSTACEA 69UNCORRECTED PAGE PROOFS developing into the actual segments of the adult limb. Our size, color of hair, and the shape of our noses make us all look different from one another. The Simple Science of Flight: From Insects to Jumbo Jets. Now, as the Bug Room Assistant, she assists with the care and maintenance of all live creatures at the museum. Further- more, calcareous sponges of the leuconoid condition do pass through asconoid and syconoid stages as they grow, and it is only in this class that all three organiza- tional body plans occur.

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The Genus Rhipicephalus (Acari, Ixodidae): A Guide to the

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A cuticle, or layer of coherent collagen, may cover (or even replace) the pinacoderm in some species. Cornell Uni- versity Press, Ithaca, NY. [Obviously dated, but still an excellent in- troduction to arthropod anatomy.] Strausfeld, N. Fast movements by a squid occur when it contracts its mantle cavity and fires a stream of water through the excurrent siphon. Although the majority of invertebrates are small, a few reach impressive sizes. Their feeding strategies include suspension feeding, predation, herbivory, scavenging, and more.

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Evolutionary Developmental Biology of Invertebrates 6:

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Patterns of ciliary currents in Atlantic reef corals and their functional significance. Prehistoric wasps were carnivores that lay their eggs in the bodies of their prey. Crustacean development is either direct, with the embryos hatching as juveniles that resemble miniature adults, or mixed, with embryos brooded for a brief or prolonged period and then hatching as a distinct larval form, which may pass through several subsequent stages before the adult condition is achieved. In ophiuroids it is suspected that coelomocytes deliver wastes to the bursae, where they are released.

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