. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TWO-PHASE CHEMORECEPTION 123 noted that the arrangement of receptors in Laccophilus makes it practically certain that the sensilla basiconica are the chemoreceptors with which the present experi- ments are concerned. The only other morphologically distinguishable receptors found in all three of the receptor-bearing areas are the sensilla chaetica and other evidence, as noted below, makes their importance in chemoreception very highly im- probable. For example, the sensilla chaetica were found on the other rlagellar seg- ment
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TWO-PHASE CHEMORECEPTION 123 noted that the arrangement of receptors in Laccophilus makes it practically certain that the sensilla basiconica are the chemoreceptors with which the present experi- ments are concerned. The only other morphologically distinguishable receptors found in all three of the receptor-bearing areas are the sensilla chaetica and other evidence, as noted below, makes their importance in chemoreception very highly im- probable. For example, the sensilla chaetica were found on the other rlagellar seg- ments of the antennae and were morphologically and numerically identical on the other segments to those on the distal segment, as well as occupying similar positions on the segments. The same is true for the coeloconic sensillum which is also. FIGURE 3. Receptors on antennae and palpi. A—distal segment of labial palp; B—distal segment of maxillary palp; C—a portion of the distal segment of an antenna. Key to receptor types and additional explanation in text. present on other flagellar segments of the antennae. Hence, if receptors other than the sensilla basiconica were chemoreceptors on the antennae, it would be necessary to assume that similar morphological types of receptors situated in corresponding positions on other antennal receptors were functioning in some entirely different manner. This hypothesis is rejected in favor of the simpler alternative—, that the sensilla basiconica of the antennae are chemoreceptors, and that the other re- ceptor types which are also present elsewhere are not chemoreceptors. The evi- dence with regard to the palpi is more equivocal. Sensilla chaetica are more abun- dant (by a factor of four) on the proximal segment of the labial palpi than on the distal segment, and are at least as abundant on the two basal segments of the maxillary. Please note that these images are extracted from scanned page images that may have been digitally enha
Size: 1716px × 1456px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
