. Bulletin. Natural history; Natural history. 344 Illinois State Laboratory of Natural History. power of protruding the trophi tlu'ougli the buccal orifice, and they may often be found nibbling at algse and other aquatic plants. Although the trophi are used by many rotifers to crush their food, there are some large forms, like Asplanchna, that swallow their food entire, as is shown by the uninjured rotifers, protozoans, and algae found in their stomachs. The chitinous jaws or trophi (Fig. 3) consist typically of two hammer-like lateral parts, the mallei, bearing one to seven comb-like apical t
. Bulletin. Natural history; Natural history. 344 Illinois State Laboratory of Natural History. power of protruding the trophi tlu'ougli the buccal orifice, and they may often be found nibbling at algse and other aquatic plants. Although the trophi are used by many rotifers to crush their food, there are some large forms, like Asplanchna, that swallow their food entire, as is shown by the uninjured rotifers, protozoans, and algae found in their stomachs. The chitinous jaws or trophi (Fig. 3) consist typically of two hammer-like lateral parts, the mallei, bearing one to seven comb-like apical teeth, and working upon the two halves of a divided central part, the incus. The mallei are usually separable into an apical part bearing the teeth, the uncus, and a basal part, the manubrium. The two divisions of the incus are the rami and its basal projection is the ful- crum. These inner and outer pairs vary greatly in relative development, the mallei in some groups disappearing entirely. Hudson and Gosse recognize seven types of trophi, as shown in the figure below. Dr. Hudson's summary of the distin- guishing features of these types is given on the next UTi+rrta Fig. 3, Diagram of trophi: A, malleate; B. sub-malleate: C, virgate; D, forcipate; E, malleo-ramate; F, incudate; G, uncinate; H, raraate. /", fulcrum; f, incus; ma, manubrium; »•. ramus; ttn, uncus. (After Hudson, from the Cambridge Natural History.). 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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