Browse Category by Invertebrates
Invertebrates

Invertebrate Dissections: Described Directly from Specimens

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Some appear to be associated specifically with discharged cnidae, such as the ciliary cone apparatus of anthozoan polyps, which is believed to function like the cnidocil in hydro- zoan and scyphozoan nematocysts (Figure 8.33). Martinson et al. (1998) showed that Chrysomela confluens preferred cottonwood resprouts because the higher concentrations of phenolithic glycosides and nitrogen there provide more protection and nutrition for the larvae.

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Invertebrates

ANIMALS WITHOUT BACKBONES. An Introduction to the

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Upon relax- ation of the muscles, there is an elastic rebound of the thoracic exoskeleton, which stretches the second set of indirect muscles and thus directly stimulates their con- traction. Malaria, which affects people in 102 countries, is caused by several species of the genus Plasmodium (Box 5G). Carapace well developed, covering most of thorax, but never fused with more than four anterior thoracic segments; maxillipeds (1–2 pairs) not associated with cephalic appendages; thoracom- ere 1 separated from head by internal skeletal bar; abdomen with well developed tail fan; pereopods biramous, except last pair, which are sometimes re- duced; pleopods reduced or, in males, modified; com- pound eyes stalked, sometimes reduced; gills absent; usually with a statocyst in each uropodal endopod; adults with antennal glands (Figures 16.12A–B, 16.30B, 16.33C).

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Invertebrates

Periegopidae (Fauna of New Zealand)

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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. Diversity of metazoan ovaries and vitellogenic mechanisms: Implications for life history theory. In hypermastigotes, pseudopodia formed in a sensitive region at the posteri- or end of the cell engulf wood particles.

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Invertebrates

Australian Longhorn Beetles (Coleoptera: Cerambycidae)

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Arthropods have an open circulatory system in which hemolymph fluid is propelled by a heart through short arteries into sinuses (the hemocoel) surrounding tissues and organs. Convergent evolution has occurred frequently through- out the Cnidaria, as witnessed by such features as colonies, calcareous skeletons, the velum-velarium struc- tures, and various means of suppressing the medusoid or polypoid stage in the life cycle. 264 CHAPTER EIGHT UNCORRECTED PAGE PROOFS Selected References General References Anderson, C.

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Invertebrates

Butterflies of West Texas Parks and Preserves

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Vision is rela- tively unimportant to many sedentary species, such as many web builders, which depend more on tactile cues, vibrations, and chemosensitivity. The dorsal diaphragm and aliform muscles are continuous over the ventral wall of the heart and vessels, but they are omit- ted from the diagram for clarity. (A) (B) (C) UNCORRECTED PAGE PROOFS Circulation and Gas Exchange The hexapod circulatory system includes a dorsal tubu- lar heart that pumps the hemocoelic fluid (blood) to- ward the head.

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Invertebrates

Cell Culture Approaches to Invertebrate Neuroscience

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Other members of the Apicomplexa undergo a type of internal budding called endopolyogeny, during which daughter cells actually form within the cyto- plasm of the mother cell. These individuals are thought to be modified avicularia, and they have a flagellum-like operculum that sweeps over the colony surface. Processes of organic production on coral reefs. The rhopalia are sensory centers, each containing a concen- tration of epidermal neurons, a pair of chemosensory pits, a statocyst, and often an ocellus.

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Invertebrates

Invertebrates of Genetic Interest (His Handbook of genetics

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Direct de- velopment occurs in some cladocerans and branchiu- rans, and in all ostracods, phyllocarids, syncarids, and peracarids. Here the embryos develop directly to the adult form. The ec- toplasm of acantharians is covered with a net-like cortex that is anchored to the apex of the spicules by contractile myonemes. They are known from intertidal SIPUNCULA AND ECHIURA 451UNCORRECTED PAGE PROOFS regions to a depth of 10,000 meters.

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Invertebrates

Classes Annelida

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In some cases, however, nutritional molecules may be taken up directly from sea water, and there is growing evidence that many invertebrates rely substantially on the direct uptake of dissolved organic matter (DOM) from their environment. Al- though this approach is still new, it shows great promise for unraveling the history of animal phyla. Boston: McGraw-Hill. (I purchased a used copy at amazon.com.) Other references available in the Redfield Reading Room: Other references for field trips/lab classes: - Abbott, R.

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Invertebrates

Is there a New Consensus in Macroeconomics?

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They are protostomes, with spiral cleavage. Porocytes are cylindrical, tubelike cells of the pinaco- derm that form the ostia (Figure 6.7C,D). The zoology collection numbers around 1.2 million specimens. Illustrative material includes viruses, bacteria, plants, fungi, insects, and humans. Notes on the genus Hystrichopsylla Rothschild in the New World, with descriptions of one new species and two new subspecies (Siphonaptera: Hystrichopsyllidae). Xiphosurans have two sets of four coxal glands each, arranged along each side of the prosoma near the coxae of the walking legs.

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Invertebrates

Wiggling Worms at Work (Let's-read-and-find-out science)

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The pedal retractor muscles in bivalves are somewhat different from those of gas- tropods, but they still run from the foot to the shell (Figure 20.8). Meiofaunal species are probably detritivores or micropredators. Usually attached to the substratum by a stalk, or pedicle 5. The fine structure of cephalopod blood vessels. Food web and detrital dynamics mediated by essential trace metals, fungal processing, and aquatic biogeochemistry across watersheds.

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