Intertidal Invertebrates of the Central California Coast:

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The pharynx is muscular, par- ticularly in the sucking insects, in which it commonly forms a pharyngeal pump. Nectonema possesses an additional dorsal, intraepidermal nerve cord. It recognizes five classes to which the living echinoderms belong, but we introduce some of the im- portant fossil forms in the phylogeny section at the end of the chapter. Some parasites live their entire adult lives in association with their hosts and are permanent parasites, whereas temporary, or intermittent parasites, such as bedbugs, only feed on the host and then leave it.

Ground Beetles (Naturalists' Handbooks)

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He teaches freshwater, marine, and general ecological courses at KU, and his Masters and doctoral graduate students work on various aspects of the ecology of organisms, communities, and ecosystems in rivers, reservoirs, and wetlands. View at Publisher · View at Google Scholar J. Keilin, “The biological significance of uric acid and guanine excretion,” Biological Reviews, vol. 34, no. 3, pp. 265–294, 1959. Studies of biological molecules, e.g., DNA, RNA, proteins, fats, vitamins, nutrients.

The grapsoid crabs of America Volume 97

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Parasitic Adaptations of Ascaris or Nematodes, 26. These sea slugs obtain functional chloroplasts from the dinoflagellates upon which they feed and incorporate them into their tissues; the chloroplasts remain active for a period of time and produce photosynthetically fixed carbon molecules utilized by the hosts. To post to CRUST-L, send messages to CRUST-L@VIMS. Der DNA-Gehalt der Zellen bei dem primitiven Metazoon Trichoplax adhaerens F.

Metal Catalysed Reactions in Ionic Liquids (Catalysis by

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These small (less than 1 cm) worms live on fresh- water crustaceans, especially crayfish. (D) Haemadipsa (suborder Arhynchobdellae) is a terrestrial leech and a bloodsucker (shown here attached to a leaf by its posterior sucker). (E) Pontobdella muricata (suborder Rhynchob- dellae), one of the piscicolid leeches that parasitizes fishes. (F) Acanthobdella peledina (order Acanthobdellida), a part- time parasite of freshwater fishes.

Spiders of New Zealand: Annotated Family Key and Species

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Their nervous systems are quite complex compared to those of other invertebrate groups, and they have well-developed eyes and good eyesight. Unlike lice, fleas are holometabolous, passing through egg, larval, pupal, and adult stages. This means that they use their body as a filter to trap their food, microscopic plankton. In at least some vesti- mentiferans the eggs are apparently released, not brood- ed, but are lecithotrophic (Young et al. 1996).

Animals Without Backbones (New Plan Texts at the University

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Phylogeny of selected maxillopodan and other crustacean taxa based on 18S ri- bosomal nucleotide sequences: A preliminary analysis. Over most of the body, the cells of the epidermis are squamous; they have sinuous inter- locking margins and may be stratified. However, because the coral colony generally sits atop a large nonliving calcareous framework, most authors speak of the skeleton as being “external.” The entire skeleton of a scleractinian coral is termed the corallum, regardless of whether the animal is soli- tary or colonial; the skeleton of a single polyp, however, is called a corallite.

An Introduction to Echinodermata

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There are several currently debated ideas about how this might have happened, and a number of others have mostly been discarded as being incompati- ble with existing evidence or with our standard defini- tion of the coelom. Hepatic amebiasis results when trophozoites enter the mesenteric veins and travel to the liver through the hepato-portal system; they digest their way through the portal capillaries and form abscesses in the liver. The mouth leads inward to an ectoder- mally derived foregut (stomodeum) consisting of a bulbous buccal cavity, sometimes a short esophagus, and a stomach.

Spiders of India

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Some species in the family Mytilidae also are borers, such as Lithophaga, which bores by mechanical means into hard calcareous rocks, shells of various other molluscs (including chitons) and corals, and the genus Adula, which bores into soft rocks. The relationship between convergence and taxonomy is discussed, demonstrating that the choice of taxonomic method will itself determine the extent to which convergence is perceived.

Dragonflies (Naturalists' Handbooks)

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Lab material will be retained for a week if possible, but you will be on your own. Furthermore, various ciliated slits and depressions among turbellarians may be homolo- gous to the cephalic slits and similar structures of the nemerteans. Two of the hearts work exclusively to move blood to the gills, while the third pumps blood through the rest of the body. However, the gills play a prominent role in the taxonomy of this group; thus, we provide brief de- scriptions of the basic types.

Jellyfish Blooms: Causes, Consequences and Recent Advances

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Unlike the vertebral column and its articulating bones, however, the notochord is an elastic, flexible rod. These new data may be in the form of newly discovered species or characteristics of organisms, new tools for the analysis of characters, or new ideas regard- ing how characteristics are evaluated. In males the testes join the ducts of sever- al accessory glands and a pair of seminal vesicles near the gonopore, which opens on the ventral sur- face of the genital segment.