Category Archive: Invertebrates

Jun 11

Phasmids of Borneo

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The muscles of the body wall are rather weak, particularly the circu- lar layer, and once removed from their tubes phoronids are capable of only limited movement. It is during such contractions that wastes (including both urine and feces) are generally also expelled in a jet away from the animal. Because of this relationship, the crocodilians and birds CLASSIFICATION, SYSTEMATICS, AND PHYLOGENY 35UNCORRECTED PAGE PROOFS Z Y X W Figure 2.5 A cladogram of four taxa, illustrating the concept of sister groups.

Jun 11

An Introduction to Annelida

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Ohio Biological Survey Bulletin New Series, 14: 1-192. Most invertebrates are organized in a way called symmetrical. Suspension feeding occurs in some gas- tropods and most bivalves. Figure 17.26 (A) The insect central nervous system. (B) Frontolateral view of the brain of a locust (Orthoptera). (A) (B) UNCORRECTED PAGE PROOFS in the proximal region of each ommatidium. If a person is stung, they can die within 4 minutes.

Jun 10

Waiting for Aphrodite: Journeys into the Time Before Bones

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Phylogenetic systematists give no taxonomic consideration to the degree of difference between taxa (i.e., the number and kinds of characters used to separate taxa), to differential rates of change in various groups, or to evolutionary events other than those involving the origin of new apomorphies. The idea that DOM may contribute significantly to the nutrition of marine invertebrates dates at least from the turn of the century. This outstanding collection was bought from Franz Spaeth through the generosity of R.

Jun 10

Siphonophores and Velellids (No. 29)

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William of Ockham, by the way, also denied the existence of universals except in the minds of humans and in language. Ask what language people speak in Germany, Japan, etc. Descriptive embryology flourished in the nineteenth century, stimulating vigorous controversy regarding the relationship between development and evolution. A recent addition to the phylum Cnidaria is a group of about 1,200 species of tiny parasites, previously clas- sified among the protists as the phylum Myxozoa.

Jun 10

Rotifera X: Rotifer Research: Trends, New Tools and Recent

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Ventilation of the tracheal system is accomplished by simple diffusion gradients, as well as by pressure changes induced by the animal itself. Electronic address: ggiribet@g.harvard.edu. Ectoprocts are typically suspension feeders, although supplemental methods occur. The upper figure depicts a situation in which the mus- cle cells are well oxygenated, oxygen demand is low, and fluid accumulates in the trachioles. Harbour Publishing, Madeira Park, California.

Jun 10

Primer of Invertebrate Learning: The Behavioral Perspective

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In at least some species urine formation involves pressure filtration, active secretion, and active resorp- tion. The mouth is located at the end of an in- trovert, called the oral cone, that projects from the head and contains protrusible oral stylets in some species. A few species reach lengths of 2–3 mm, but most are less than a millimeter long. They are sedentary animals and look like plants. Internal transport is largely through the expansive gut; diffusion distances through the mesenchyme are small between its lumen and the body wall.

Jun 10

Marine and Brackish Water Harpacticoid Copepods: Pt. 1

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A special form of autotrophy that occurs in certain bacteria relies not on sunlight and photosynthesis as a source of energy to make organic molecules from inorganic raw materials (pho- toautotrophy), but rather on the oxidization of certain inorganic substances. There are about 800 different species of sponges, and 88% are marine. "Marine" means that they live in salt water, such as an ocean or a sea. Today, do the lily pad pieces (pages 24-27). The Hot-Blooded Insects: Strategies and Mechanisms of Thermoregulation.

Jun 09

Ecological Impacts of Non-Native Invertebrates and Fungi on

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These anterior appendages are followed by 13–43 pairs of simple saclike (lobopodal) walking legs. Here are a couple of webpages to get you going. This is for the older kids (M), Animals in Winter – Hibernation, Migration and Adaptation If you have lots of kids and not enough pieces, someone (or several) could make their own pieces to add. Origin; comparative account of skeleton, circulatory, Cell Biology, Morphology excretory and nervous systems, development (egg types, cleavage, blastula and gastrula, germ layer/formation, embryonic membranes and placentation) natural history (mode of life, migration, adaptations, biting mechanism of snakes).

Jun 09

The Carabidae (Coleoptera) of Fennoscandia and Denmark,

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In most cases, at least developmen- tally, each of these regions contains a separate, often paired, coelomic compartment: protocoel, mesocoel, and metacoel, respectively (see Chapter 4). Review of The Arthropoda: Habits, Functional Mor- phology, and Evolution by S. Bivalve mollusks: Fluid dynamics of burrowing. A neuron consists of a body which contains the nucleus; dendrites, which are short branches off the body that receive incoming impulses; and a long axon which carries impulses away from the body and to the next neuron. notochord -- Characteristic of chordates, the notochord is a stiff rod of tissue along the back of the body.

Jun 09

Animals Without Backbones: An Introduction to the

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The mutualistic relationships between plants and their pollinators are essential to the survival of most flow- ering plants and their insect partners (and, in some cases, their bird or nectar-feeding bat partners). Pogue, now at USDA/Smithsonian, was employed as Curatorial Assistant from 1975-1979, having been responsible for the curation of birds and insects. It builds professional resume writer us and stands on a head. The oviduct and usually the nephridioducts also empty into this cloaca.

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