Download A Photographic Atlas of Marine Biology by Michael J. Leboffe, Gary D. Wisehart, Erin C. Rempala PDF

By Michael J. Leboffe, Gary D. Wisehart, Erin C. Rempala

This publication is a full-color complement that offers photos of preserved specimens and photographs taken at quite a few aquaria to supply assurance of organisms within the world's oceans. it's designed to accompany any marine biology textual content or laboratory guide.

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Consideration is given to the most abundant and ­ecologically important of each clade (Figure 3-1). The major eukaryotic clade Chromalveolata, Superphylum Alveolata (alveola—diminutive of alveus—cavity, hollow), are named for vesicles under the cell membrane, which help support the organisms. They also possess ­mitochondria, cilia, and flagella with distinct structures. Alveolata currently consists of three phyla. Only the two with the greatest known number of marine species will be considered here.

Valve view, Navicula is rectangular, frequently with a slight constriction in the middle. incomplete circular pieces wrap around them to form the girdle. Some pennate diatoms are motile and have a central, longitudinal line called a raphe (raphe—seam). Cell walls may be variously ornamented by grooves and holes. The frustule shape and its ornamentation are so distinctive that diatoms often can be identified from the frustules of deceased cells (Figure 4-7). Figure 4-8 shows a variety of living planktonic and sessile (sess—seated) diatoms.

Fertilization produces a new cell and the cycle repeats. Many pennate diatoms are motile by a gliding mechanism, which serves them well as they are most commonly found in sediments. Centric diatoms are nonmotile and are most frequently found in the plankton. Haptophyta Haptophytes are unicellular algae with two smooth flagella. They are distinguished by the presence of a haptonema m 4-7 Geologically Recent Marine Diatoms—Strew F ­ requently in biology classes diatom diversity is studied using slides made from diatomaceous earth, which contains the empty frustules of deceased diatoms in great abundance.

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