. Fresh-water biology. Freshwater biology. 868 FRESH-WATER BIOLOGY 42 (43) Body laterally compressed, epimeral plate extending up on the lat- eral surface, leaving only a dorsal median furrow. Frontipoda Koenike 1891. A mite of medium size, somewhat less than I mm. long, looking curiously like a very flat elliptical seed, emarginate at the hilum where the legs are bunched together; usually of a greenish color. One species, frequent in our northern lakes and apparently identical with the one generally distributed European species, F. musculus (Mijller). Fig. 1341. Frontipoda musculus fMiiller).
. Fresh-water biology. Freshwater biology. 868 FRESH-WATER BIOLOGY 42 (43) Body laterally compressed, epimeral plate extending up on the lat- eral surface, leaving only a dorsal median furrow. Frontipoda Koenike 1891. A mite of medium size, somewhat less than I mm. long, looking curiously like a very flat elliptical seed, emarginate at the hilum where the legs are bunched together; usually of a greenish color. One species, frequent in our northern lakes and apparently identical with the one generally distributed European species, F. musculus (Mijller). Fig. 1341. Frontipoda musculus fMiiller). Ventral surface, female. X31. Outer side of palpus, female. X 93. (Modified from Piersig.) 43 (42) Body not so decidedly compressed, epimeral plate not extending upward on the lateral surface. . Oxus Kramer 1877. A form of medimn size, different species vary- ing in length from to mm., with body elongate in form; legs crowded toward the an- terior end. Known in North America only from Wisconsin, where the one species seems to be rare. This is undescribed, but is similar to 0. ovalis (Miiller) and O. slrigalus (Miiller) the common European forms. Fig. 1342. Oxus ovalis fMiiller). Ventral surface, female. X 30. Oxus slrigatus (MuWer). Outerside, palpus female. X 90. (Modified from Piersig.) 44 (23) Epimera arranged in groups, in the female always clearly separate from one another, in the male closer together but distinct, only in rare cases in contact or tending in a slight degree to fuse 45 45 (64) Epimera in four groups, in the male in some cases only a narrow interval between them 46. 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
