. Fresh-water biology. Freshwater biology. Fig. 13 21. Figures showing the ventral surface of the body of the nymphs of several genera ol water-mites. (Appendages are similar to those of the adult and not shown here; compare with figures of adults on succeeding pages.) a, Arrhenurus; b, Limnesia; c, Sperchon; d, Hygrobales; e, Fiona; /, Leberlia. (Modified from Piersig.) •distinguish the adult. During this nymph stage the mite is not usually parasitic except in the case of the mussel parasites. How- ever, Unionicola crassipes has been found by Soar, in all stages, in the fresh-water sponge, an
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. Fresh-water biology. Freshwater biology. Fig. 13 21. Figures showing the ventral surface of the body of the nymphs of several genera ol water-mites. (Appendages are similar to those of the adult and not shown here; compare with figures of adults on succeeding pages.) a, Arrhenurus; b, Limnesia; c, Sperchon; d, Hygrobales; e, Fiona; /, Leberlia. (Modified from Piersig.) •distinguish the adult. During this nymph stage the mite is not usually parasitic except in the case of the mussel parasites. How- ever, Unionicola crassipes has been found by Soar, in all stages, in the fresh-water sponge, and the author has taken the different de- velopmental stages of a species of Fiona in the gelatinous matrix of a colonial protozoan. Another moult must occur before the mite becomes adult, but this is passed through rapidly and in the forms in which the nymph is free frequently occurs while the animal is clinging to aquatic plants. This moult may or may not be ac-. 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 work.. Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. , etc. ]