. Bulletin of the Illinois State Laboratory of Natural History. Natural history; Natural history -- Illinois. 344 Illinois State Laboratory of Natural History. power of protruding the tropin through the buccal orifice, and they may often be found nibbling at algae and other aquatic plants. Although the tropin 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 algre found in their stomachs. The chitinous jaws or tropin (Fig. 3) consist typically of two hammer-like late
. Bulletin of the Illinois State Laboratory of Natural History. Natural history; Natural history -- Illinois. 344 Illinois State Laboratory of Natural History. power of protruding the tropin through the buccal orifice, and they may often be found nibbling at algae and other aquatic plants. Although the tropin 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 algre found in their stomachs. The chitinous jaws or tropin (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 tropin, as shown in the figure below. Dr. Hudson's summary of the distin- guishing features of these types is given on the next un+wa Fig. 3, Diagram of trophi: A, malleate; B. sub-malleate: ; D, forcipate; E. raalleo-ramate; F, incudate; G, uncinate; ET, ramate. f, fulcrum; i, incus; wia, manubrium: r, ramus; un, 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 State Laboratory of Natural History. Bloomington, Ill. : The Laboratory
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