. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 60.—The appendiculate Oikopleura albicans (black) in its house. To the left of the animal is the permanently outspread net. The black arrows show the direction of the currents of water produced by the undulation of the tail. The light arrow beneath points in the direction in which the animal moves. After Lohmann. purpose. The cephalopod Chiroteuthis has its sucking disks trans- formed for this purpose into sticky threads, from which the food is removed by the specially ada
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 60.—The appendiculate Oikopleura albicans (black) in its house. To the left of the animal is the permanently outspread net. The black arrows show the direction of the currents of water produced by the undulation of the tail. The light arrow beneath points in the direction in which the animal moves. After Lohmann. purpose. The cephalopod Chiroteuthis has its sucking disks trans- formed for this purpose into sticky threads, from which the food is removed by the specially adapted The most singular means of securing food is that of the animals which strain out the living forms from a stream of water which they produce themselves. Nets or screens are produced for this purpose. The bristles of the mouth parts of Cladocera and copepods (Fig. 59), the slime bands in the body cavities of salpas and pyrosomas, the remark- able apparatus of the appendiculates, built up out of jelly-threads (Fig. 60), the screen-like gill strainers of the plankton-eating fishes, such as the herring or the giant sharks, and the baleen of the toothless whales, all illustrate this means of food-getting. The effectiveness of this apparatus is shown by the fact already stated that a whole new world of minute plankton creatures, the nannoplankton, which had escaped the finest silk nets, was discovered by examination of the appendiculate sieve, and by the presence in the stomach of a single herring of 60,895 small
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
