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Category: Invertebrates

The Geometroid Moths of North Europe - Lepidoptera -

The Geometroid Moths of North Europe - Lepidoptera -

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Here the buccal field is quite reduced, and the circumapical field is separated into two ciliary rings, one slightly anterior to the other (Figure 12.2B). Most Hydra are gonochoric and both sexual and asexual (clonal) reproduction occur. All the listed phyla are invertebrates along with two of the three subphyla in Phylum Chordata: Urochordata and Cephalochordata. In those species that are largely confined to moist habitats and nocturnal ac- tivity patterns, a significant portion of the excretory wastes may be ammonia rather than uric acid.

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Attachment Devices of Insect Cuticle

Attachment Devices of Insect Cuticle

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Certain planktonic cope- pods, for example, move haltingly and depend on their long antennules and dense setation for flotation be- tween movements (Figure 16.18F). The nature of the test is a taxonomic feature used to classify forams. Most species can retract the tentacles into the sheaths by muscles. The life cycle does not include a free larva. Most people just assume that fossils and evolution go hand in hand. Some species graze on sponges, ectoprocts, and tunicates, while others consume the flesh of bar- nacles, leaving behind the empty shell.

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Parasite Rex: Inside the Bizarre World of Nature's Most

Parasite Rex: Inside the Bizarre World of Nature's Most

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Elsewhere it has been introduced by humans. These included improvement of collections care by increased environmental monitoring and implementation of an Integrated Pest Management (IPM) program in 1988. Nematoda nematodes, roundworms, threadworms(some), whipworms, lungworms, hookworms, eelworms; a pseudocoelomate phylum with both parasitic and free-living representatives, exist in very large numbers (Ascaris, Caenorhabditis C. elegans, Haemonchus, Heterorhabditis, Meloidogyne, Onchocerca, Toxocara) --[ dedicated site ToL ummzADW links ] Acanthocephala acanthocephalans, spiny headed worms; a parasitic pseudocoelomate phylum with spiny protrusible proboscis (Acanthocephalus, Corynosoma, Moniliformis) --[ ToL links ] Nemertinea (=Rhynchocoela, Nemertea) nemertines, proboscis worms, rhynchocoels, ribbon worms, acoelomate worms with extensible proboscis (Cerebratulus, Lineus) --[ ToL ucmp links ] Polychaeta lugworms, paddleworms, polychaetes, ragworms, sandworms, include parasitic Myzostomida but otherwise mostly marine (Arenicola, Cirratulus, Glycera, Lanice, Nereis, Polydora, Serpula) --[ biblio ucmp ummzADW links ] Rotifera (=Rotatoria) rotifers,'wheel animals' named for rotating ring of cilia; a pseudocoelomate phylum (Asplanchna, Brachionus, Lecane) --[ links ] Echiura echiurans, spoon worms, marine worms with extensible proboscis which live in u-shaped tubes (Echiurus, Urechis) --[ ToL ucmp links ] Gastrotricha gastrotrichs, free-living wormlike organisms with lobed heads; a pseudocoelomate phylum (Chaetonotus, Macrodasys, Xenotrichula) --[ ToL links ] Kinorhyncha kinorhynchs, free-living marine, with spiny heads used in characteristic locomotion after which they are named; a pseudocoelomate phylum (Echinoderes) --[ ToL links ] Sipuncula sipunculids, peanut worms, unsegmented protostomate marine worms characterized by the introvert, a contractile organ used in locomotion (Golfingia, Phascolion, Sipunculus) --[ ToL ucmp links ] Vestimentifera vestimentifers, phylum first described in 1985 for genera formerly considered to be pogonophorans (Escarpia, Lamellibrachia, Ridgeia) --[ ToL links ] Brachiopoda brachiopods, lamp shells; a marine lophophorate phylum of shelled animals with an extensive fossil record; Lingula is possibly the oldest genus with known living representatives --[ ToL dedicated site ucmp links ] Bryozoa (=Ectoprocta, Polyzoa) bryozoans, ectoprocts, polyzoans, 'moss' animals; a lophophorate & coelomate phylum of graytic & mostly colonial animals; (some classifications group Ectoprocta together with Entoprocta as Bryozoa) (Bugula, Membranipora, Plumatella) --[ dedicated site ToL ucmp links ]

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Crustaceana. Studies on Gammaridea, II: Proceedings of the

Crustaceana. Studies on Gammaridea, II: Proceedings of the

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The saltiness, or salinity, of seawater averages about 3.5 percent (usually expressed as parts per thousand, 35‰). In Chapters 3 and 4 we lay out the fundamen- tal anatomical and morphological designs and develop- mental strategies of invertebrates. 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. Your primary objective in this course is, therefore, not to master invertebrate biology but, rather, to gain an overview of the organismal biology of the major groups of animal organisms including the chordata but excluding the Vertebrata (If it has bones we won't mess with it).

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Plankton: A Guide to Their Ecology and Monitoring for Water

Plankton: A Guide to Their Ecology and Monitoring for Water

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Like the earliest protostome, the first deuterostome probably was a bilaterally symmetrical, vermiform burrower. Special mechanoreceptors in the walking legs are stimulated as the waves pass beneath the scorpion’s limbs. In most of these ani- mals, nitrogenous wastes are expelled primarily by dif- fusion across the general body surface. Unidentified species - Hinewai Reserve, Banks Penninsula, MC, South Island Unidentified species - Kawhatau Base, RI, North Island Further information on New Zealand Symphyla: Adam, M.

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Handbook of Invertebrate Zoology. For Laboratories and

Handbook of Invertebrate Zoology. For Laboratories and

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The body, hidden beneath a well developed carapace, is distinctly flattened dorsoventrally and often expanded laterally. Invertebrates live in a vast range of habitats, from forests and deserts to caves and seabed mud. Hox genes have been conserved to a remarkable de- gree throughout the animal kingdom, and they are now known from all animal phyla that have been examined. We empha- size that various combinations of these and other forms of nitrogen excretion are found in most animals.

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Ostracodology - Linking Bio- and Geosciences: Proceedings of

Ostracodology - Linking Bio- and Geosciences: Proceedings of

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Please delete your old bookmarks and reenter from our new starting addresse to get into our homepage. Verlags, Leipzig. [The origin of the concept of the “Spiralia.”] Sedgwick, A. 1884. These strange little creatures resemble scorpions in general appearance, but they lack the elongation of the opisthosoma and telson and do not have a stinging ap- paratus. Sur- face hunters that live in intertidal areas generally for- age during high tides or at night, and thus avoid the threats of desiccation and visual predators.

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Elsevier's Dictionary of Invertebrates (Excluding

Elsevier's Dictionary of Invertebrates (Excluding

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Its scientific name disguised by colorful cultural argot or perhaps in a different language? The minute sizes and precarious habitats of water bears have resulted in their acquisition of numerous traits also seen in some blastocoelomate groups that live in similar habitats. Porifera: General Account; 23. UNCORRECTED PAGE PROOFS (C) PHYLUM MOLLUSCA 9 Figure 20.5 General anatomy of limpet-like archaeogastropods. (A) The volcano limpet Fissurella (family Fissurellidae) (lateral view). (B) Acmaea (family Acmaeidae) (ventral view).

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Advanced Practical Invertebrate Zoology

Advanced Practical Invertebrate Zoology

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Figure 2.8 Common models of speciation. (A) One species splits into two new species. (B) One species is trans- formed into another. Gonads may be on the manubrium or on the radial canals. Poriferan Phylogeny The Origin of Sponges Sponges are an ancient group, and the important events in their origin and early evolution lie hidden in Pre- cambrian time. This arrangement is commonly referred to as a ladder-like nervous system. In most sea cucumbers, in which the skeletal plates are usually tiny separate ossicles, the body wall muscles form thick sheets, adding structural integrity to the body by working on the coelomic spaces to provide a hydrostatic skeleton.

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Intrinsic Immunity (Current Topics in Microbiology and

Intrinsic Immunity (Current Topics in Microbiology and

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Although the eukaryotes prob- ably arose only once, most workers believe that the pro- tists are a paraphyletic group (i.e., many different groups that evolved out of the Protista are not classified as protists). Process produces pattern of reticulation 3. The vertebrates are described in a separate page. It is divided into a head (introvert), neck, thorax, and loricate abdomen. The intestine extends posteriorly, where it ends blindly in articulates or re- curves as a rectum terminating in an anal opening in inarticulates.

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