. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Chemoreception 451 tures. In the aquatic species of insects the subject of two types of chemore- ceptors is controversial, and the problem is well reviewed by Dethier and *' There is good evidence for the existence in insects of a third type of chemoreceptor which is excited at high concentrations, and the re- sulting response is usually an avoiding reaction. These receptors presumably mediate the general chemical sense previously mentioned (page 447). Placode mmal strand Cap cell- Enveloping eel. scic
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Chemoreception 451 tures. In the aquatic species of insects the subject of two types of chemore- ceptors is controversial, and the problem is well reviewed by Dethier and *' There is good evidence for the existence in insects of a third type of chemoreceptor which is excited at high concentrations, and the re- sulting response is usually an avoiding reaction. These receptors presumably mediate the general chemical sense previously mentioned (page 447). Placode mmal strand Cap cell- Enveloping eel. scicle of ense cell processes Vacuole Sense cells Basement membrane Fig. 144. Diagram of a sensillum placodeum of the bee, vertical section. From Snodgrass.'". 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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