Marine Invertebrates of the Pacific Northwest

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The intestine narrows into a short rectum leading to the anus, which is located either centrally on the aboral surface, on the posterior margin, or posteriorly on the oral surface. At that level of classification, more can be said about their shared adaptations, anatomy, and evolutionary history than can ever be said for all invertebrates as one big group. First, sensory receptors allow the organism to monitor its external environment and detect changes that occur (for example, an increase in temperature).

Provisional Atlas of the Aculeate Hymenoptera of Britain and

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These animals are members of the Family Synaptidae in the Class Holothuroidea and the Phylum Echinodermata. Nematodes of the ideal bioindicators, in view of their ubiquity and hardy nature, can be tested for such studies to detect stress at cellular as well as molecular levels and its impacts on coelomocytes, if any. However, members of some genera (e.g., Tubulanus, Para- nemertes, Amphiporus) may frequently be seen during low tides on foggy mornings, gliding over the sub- stratum in search of prey.

Energetics of Desert Invertebrates (Adaptations of Desert

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Like that of polyps, the ex- ternal surfaces of medusae are covered with epidermis, and the internal surfaces (coelenteron and canals) are lined with gastrodermis. The most primitive thaliaceans are thought to be the colonial pyrosomids (order Pyrosomida) because of their similarities to compound ascidians. The Crucible of Creation: The Burgess Shale and the Rise of Animals. Crustaceana 21: 165–175. [See Schminke 1976 for an opposing view.] Bowman, T.

The Freshwater Mussels of Ohio

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In (B) (lateral view) and (C) (ventral view) the legs have been omit- ted, except the coxae. (D) The notorious black widow spider, Latrodectus (family Theridiidae). (E) Liphistius (suborder Mesothelae) (side view with legs removed). The precise nature of these or- gans is not well understood, but they are probably not homologous to the Malpighian tubules of arthropods. Phagocytic blood cells and certain regions of the midgut are also thought to accumulate wastes.

Palaeontology Invertebrate (Eighth Edition), 1957, 477 pages

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Collection of food by oral surface podia in the sand dollar, Echinarachnius parma (Lamarck). Chapter 3, Establishing the primary axes of fruit fly embryos, and Chapter 4, Patterning fly appendages and eyes. The aberrant medusae of chondrophorans are short-lived and do not possess a functional mouth or gut, probably relying instead on their symbiotic zooxanthellae for nutrition. Walking and surface film locomotion in terrestrial and semi-aquatic spiders. UNCORRECTED PAGE PROOFS Circulation, Gas Exchange, and Excretion Circulation of metabolites in single zooids is by diffu- sion, because there is no structural system for this pur- pose.

Insects on Nettles (Naturalists' Handbooks)

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Remember that in each of these cases movement occurs in both directions, but it is the potential net movement along the gradient that is important and against which freshwater and terres- trial animals must constantly battle. Vertebrates have a well-developed nervous system that enables them to react swiftly to environmental changes, but invertebrates have simple nervous systems that allows them to behave by instinct. Body divided into 13 segments by articulating cuticular plates (dorsal tergites and ventral stern- ites).

Ticks and Tick-Borne Pathogens: Proceedings of the 4th

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Thus, most modern workers attempt to avoid the pitfalls of a priori construction of a hypothetical ancestor, and in- stead analyze the evolutionary history of molluscs by phylogenetic inference (e.g., Lauterbach 1983; Wing- strand 1985; Scheltema 1988, 1996; Salvini-Plawen 1990). You can read more if you need to in the information on the pdf with the lapbook piece. (printed on Day 141) Complete pages 30-31 and complete the anatomy cards. Some actually live among and eat the nematocyst-bearing parts of the host, such as the tentacles or oral arms.

Fresh-Water Invertebrates of the United States: Protozoa to

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But Michigan is among the country’s top 10 honey producers and plays a primary role in the beekeeping business. Optimal life histories and the age-specific cost of re- production. Full-color photographs add to the text by giving readers a close-up look at these shelled minibeasts. more... The pearly nautilus, however, is long-lived (perhaps to 25–30 years), slow growing, and able to reproduce for many years after maturity. There is now a great deal of evidence in support of SET.

EXPLORING PARASITE GENOMES SYMPOSIA OF THE BRITISH SOCIETY

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When a spore is ingested by a potential host, the polar tube ex- tends, carrying with it the spore cytoplasm, and attach- 172 CHAPTER FIVEUNCORRECTED PAGE PROOFS Figure 5.46 Phyla Cryptomonada and Chlorophyta. (A) Cryptomonas, a cryptomonad. (B) Volvox, a colonial chloro- phyte. (C) Chlamydomonas reinhardtii, an autotrophic, uni- cellular species. (A) (B) (C) Figure 5.47 Phylum Microspora. (A) Spore of Thelohania californica with its coiled polar tube. (B) Spore of micro- sporan from the body of the ciliate, Spathidiopsis (TEM). (A) (B) Polar cap es to and penetrates cells of the host’s gut wall.

The Frit Flies (Chloropidae, Diptera) of Fennoscandia and

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Senior Division projects otherwise appropriate for this category belong in Microbiology (General). 17. Presum- ably, the sponge matrix provides a rich medium for bac- terial growth, and the host benefits by being able to con- veniently phagocytize the bacteria for food. Photo: Caribou on Herschel Island in the arctic ocean, site of an International Polar Year project. During this swim- ming phase the larvae of at least some species can change shape rapidly from elongate to ovoid to flat.