. Fresh-water biology. Freshwater biology. 894 FRESH-WATER BIOLOGY here again is given evidence of independent adaptation to aquatic Kfe, and nowhere could be found more complete intergradation of habits between terrestrial and shore-loving forms and those that dwell in the water. The shore bugs (Acanthiidae) and toad bugs (Pelogonidae) are essentially terrestrial; the marsh treaders (Hydrometridae), water. Fig. 1364. A giant water bug, Benacus, clinging to a vertical surface under water. striders, skaters, etc. (Veliidae and Gerridae), have passed out upon the surface, a few of them having ac
. Fresh-water biology. Freshwater biology. 894 FRESH-WATER BIOLOGY here again is given evidence of independent adaptation to aquatic Kfe, and nowhere could be found more complete intergradation of habits between terrestrial and shore-loving forms and those that dwell in the water. The shore bugs (Acanthiidae) and toad bugs (Pelogonidae) are essentially terrestrial; the marsh treaders (Hydrometridae), water. Fig. 1364. A giant water bug, Benacus, clinging to a vertical surface under water. striders, skaters, etc. (Veliidae and Gerridae), have passed out upon the surface, a few of them having acquired the ability to dive and swim. The Nepidae and Belostomatidae are fairly adapted forms that do not depart far or long from the surface of the water, and only the Corixidae and Notonectidae have acquired very highly specialized apparatus for swimming and for carrying down a copious air supply. There are no tracheal gills developed in this order. Nymphs and adults alike must come to the surface for air. They are easily collected by sweeping aquatic vegetation with a dip net. The Corixidae stick more closely to the bottom than do other Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
