. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I. 10 GROWTH OF LEECH SENSE ORGANS 391 Sensi/lum size in postembryonic to ac/uli leeches After demonstrating a positive correlation between the area of a neural sensillum and the number of S and G cilia it contains, we used the diameter of both neural and annular sensilla as an indirect measure of the number of S and G ciliated cells in leeches whose weights spanned a range from immediately postembryonic to large adult. We measured the major diameter of 176 neural sensilla and 712 annular sensilla in 23 leeches weighing from
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. I. 10 GROWTH OF LEECH SENSE ORGANS 391 Sensi/lum size in postembryonic to ac/uli leeches After demonstrating a positive correlation between the area of a neural sensillum and the number of S and G cilia it contains, we used the diameter of both neural and annular sensilla as an indirect measure of the number of S and G ciliated cells in leeches whose weights spanned a range from immediately postembryonic to large adult. We measured the major diameter of 176 neural sensilla and 712 annular sensilla in 23 leeches weighing from 24 to 5450 mg. Over this weight range, leech weight is posi- tively correlated with the diameter of both neural (r = ) and annular (r = ) sensilla (Fig. 4). Though significant, the growth of annular sensilla is small. The ratio between the average area of the annular sensilla in the smallest and largest leech was 1:4, and the similar ratio for the neural sensilla was 1:24. The area of the neural sensilla in any one leech varies and is positively correlated with the number of ciliated cells it contains (Fig. 5). 10 100 1000 10000 Weight (mg) Figure 4. Mean (±1 SD) of neural (•) and annular (D) sensilla on midbody segments of leeches of different weights plotted against log weight of the leech. The size of both neural and annular sensilla is directly correlated with the size of the leech, but the size increase of the annular sensilla over this weight range is small compared with the size increase of the neural sensilla over the same weight range. A line of best tit is drawn through each set of data points. liott, 1987). Measurements of sensilla dimensions are therefore relative rather than absolute. Relationship between sensillum area anil number of cilia We measured the major and minor diameter of 10 an- nular sensilla and 10-31 neural sensilla in each of four leeches whose weights ranged from 94 to 2600 mg. We counted the number of S and G cilia in the neural sensil
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