Invertebrates

Myelinated Fibers and Saltatory Conduction in the Shrimp:

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The genetic and evolutionary consequences of sym- biosis. The Snod- grass classification embraces three important hypothe- ses: (1) arthropods constitute a monophyletic taxon; (2) myriapods and hexapods are sister groups, together forming a taxon called Atelocerata (= Tracheata, or Uni- ramia according to some authors); and (3) Crustacea and Atelocerata are sister groups, together forming a taxon called the Mandibulata.

Diapause in Aquatic Invertebrates: Theory and Human Use

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The nautiloids underwent a series of radiations during the Paleozoic, but were largely re- placed by the ammonoids after the Devonian period (325 million years ago). Heather wrote, directed and programmed the hydrozoan & scyphozoan life cycles. FAMILY ALMIDAE: Includes about 40 species of freshwater and mud-dwelling species. The primary larva may be a modified nauplius. By the way I have a FREE Living/Non-Living Printable you should check out!

The Pearly Mussels of Pennsylvania

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The number of parabasal fibers is variable. Arthropods have evolved a variety of highly efficient ex- cretory structures that share a common adaptive feature in that they are internally closed. In some, the alveoli are filled with polysaccha- rides, typically cellulose, and these dinoflagellates are said to be thecate, or armored (e.g., Protoperidinium). The haploid individual encysts and transforms into a ga- mont. The primary photosynthetic pig- ments are chlorophylls a, c1, and c2. (D) Phyla Euglenida and Dinoflagellata.

From Taxonomy to Phylogenetics Life and Work of Willi

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Ultrastructure of the mucus feeding filters of the house of the appendicularians Oikopleura vanhoeffeni. Similar to spiders, they inject digestive liquid into the prey they have caught, and then suck up dissolved tissues. In addition to the lophophore, these three phyla share a U-shaped digestive tract and the absence of a head. Nearly all nemerteans are marine, but a few species inhabit fresh water or damp soil.

Molecular biology of invertebrate development: Proceedings

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Department of Geosciences, University of Houston, pp. 581–590. Viewed in this context a number of invertebrates have evolved incomplete or even completely cell-lined vessels and or lacunae with a highly branched vasculature that allows for the production of significant driving pressures and flows to meet relatively high metabolic demands driven by active life styles. Insects and spiders move by means of several pairs of legs and are waterproof. The Schluter lab studies evolution of marine into freshwater forms in B.

An Inordinate Fondness for Beetles

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Formation of eggs and cleavage in Trichoplax ad- haerens. Gut incomplete (anus rudimentary or vestigial) 4. Byssal threads probably represent a primitive and per- sisting larval feature in those groups that retain them into adulthood, and many bivalves lacking byssal threads as adults utilize them for initial attachment dur- ing settlement. Perhaps the most interesting and familiar use of silk by spiders, however, is prey capture.

Aquatic Oligochaete Biology VIII: Proceedings of the 8th

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Most cnidae are nematocysts and these are present in all three higher cnidarian taxa. Cellular changes in- volved in restitution and reorganisation. Some homologous features look very different in different taxa (e.g., the pectoral fins of whales and the arms of humans; the forewings of bee- tles and of flies). For each of the 32 currently recognized phyla, Invertebrates, Third Edition presents detailed classifications, revised taxonomic synopses, updated information on general biology and anatomy, and current phylogenetic hypotheses, organized with boxes and tables, and illustrated with abundant line drawings and new color photos.

Illustrations of comparative anatomy, vertebrate and

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What is Missing - On these cards a body part is missing, children try to find which one on each card. Gustav Fischer Verlag, Stuttgart, pp. 231–262. There may be other causes,” Cameron said, adding that climate change appears to play a role in the drop-off of bee populations in Europe. Invertebrates have two basic body plans: one is the radial symmetry plan (a circular shape arranged around a central mouth, similar to the way spokes radiate out from the hub of a wheel), which includes animals who spend their adult lives fastened in one place; and the bilateral symmetry plan (right and left halves that mirror each other and typically have a definite front and back end).

Zoological Catalogue of Australia (Zoological Catalogue of

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Nearly 1,500 species from birds and mammals have been de- scribed. The symbionts of freshwater hydrozoans (e.g., Chlor- hydra) are single-celled species of green algae (Chloro- phyta) called “zoochlorellae.” In marine cnidarians, the protists are unicellular cryptomonads and dinoflagellates called “zooxanthellae” (probably many genera including Zooxanthella [= Symbiodinium]) (Figure 8.31). Some are known from algal mats or holdfasts, sandy beaches, and brackish estuar- ies; others live on hydroids, ectoprocts, or sponges.

Earthworms and Their Allies

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This distinction, however, is sometimes blurred, for there are a number of protists that form complex colonies with some division of labor among different cell types. For instance, when moving across relatively smooth surfaces, earthworms may employ the mouth as a sort of sucker. Prerequisites: Application to the OBS Internship Program, permission of the instructor Schedule: Schedules will be arranged individually with the instructor.