シナハマダラカ ANOPHELES HYRCANUS (PALLAS) VAR. SINENSIS WIEDEMANN 幼蟲の櫛歯の變異及變態

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The fluctuation of the total pecten teeth numbers is of conciderable degree in each instar, the skart of the curve of an instar reaching that of next and next instar. The pecten teeth are divisible into proximal and distal ones ; the former consist of alternative groups of a long main tooth and short accessory teeth. The main teeth are about 5 in number, somewhat decreasing after 1st moult and then increasing again. The accessory teeth count t-1 (t=number of the instar) in modal value, -this point may be much available for diagnosing the instar-decreasing in proximal and distal groups, in which the main teeth are, on the other hand, longer than in median group, so that the length of the main teeth proportionates negatively to the numbers of their accessory teeth. The distal teeth are about 3 in number, somewhat decreasing after the 1st moult and increasing after the 3rd moult. The arraugement of the distal teeth is as follows : proximally come the main teeth, n_d-2 in number (n_d=numbers of the distal teeth), and nexts (penultimate and ultimate) come 2 teeth, arranged in one of the following 5 different manners : CC, BC, AC, AB, and AA (A=main tooth, C=accessory tooth, B=intermediate tooth between A and C). The occurance of the ultimate C is most frequent in the 4th instar. The author establishes the "pecten formulae" arranging in figures the numbers of accessory teeth between and both ends of the main teeth and putting a decimal point between figures of proximal and distal teeth (e.g. between proximal and distal pecten formulae), and he selected the standard pecten formula, which shows the maximum value of probability of occurance in each instar, and is 000000.000, 01111.00, 022211.00 and 023311.01 in each instar respectively. The relation between the total teeth numbers (N) and the number of the instar (t) is experimentally shown by N=4(t+1). In another view, the increasing ratios of N are more or less of geometrical progression, agreeing to the DYAR's law of growth. Some discussions are made on the biological meaning of the structures of the pecten.
1942-08-30

シナハマダラカ ANOPHELES HYRCANUS (PALLAS) VAR. SINENSIS WIEDEMANN 幼蟲の櫛歯の變異及變態

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