. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 54 I. NAKATANI ET AL Table I Summary of wounding experiment in the crayfish Procambarus clarkii (values represent number of chelipeds) Developed extra structures1 Double Single Wounded Autotomized Claws Dactyls Dactyl Projection Healed normally4 Eyestalks With 1 14 10 1118 93 Without 20 1 1010 17 1 A total of 134 chelipeds from 34 crayfish received a V-shaped incision. After 10 to 20 days, both eyestalks were removed from 5 of the animals (20 chelipeds). : Some animals autotomized chelipeds post-operatively. 3 Extra structur
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 54 I. NAKATANI ET AL Table I Summary of wounding experiment in the crayfish Procambarus clarkii (values represent number of chelipeds) Developed extra structures1 Double Single Wounded Autotomized Claws Dactyls Dactyl Projection Healed normally4 Eyestalks With 1 14 10 1118 93 Without 20 1 1010 17 1 A total of 134 chelipeds from 34 crayfish received a V-shaped incision. After 10 to 20 days, both eyestalks were removed from 5 of the animals (20 chelipeds). : Some animals autotomized chelipeds post-operatively. 3 Extra structures developed in 13 chelipeds. 4 Most of the chelipeds healed normally, with no Figure 2. Development of extra claws on the third chehped of the crayfish after a wound was made in the propodus. Both eyestalks were removed at the base on day 1 1 after wounding. (A) Two projections long (arrowheads) developed on the propodus, but the dactyl and pollex were torn off at the first post-operation molt. (B) The projec- tions developed into two poor claws at the second molt, and the untoni remaining part regenerated the dactyl and pollex. (C) The claws devel- oped fully at the third molt. A and B. the castoff exuviae after the second and third molts, respectively, a, primary claw; b and c, extra claws. Bar = mm. Morphology of a pair of extra dactyls Two dactyls appeared on one of the chelipeds of a crayfish with eyestalks. The V-shaped wound seemed to have healed normally at the first molt. However, extra dactyls appeared on the right second cheliped at the sec- ond molt (Fig. 3, a, b). The extra dactyls developed on the primary propodus near the primary dactyl, although the wound was made at the base of the propodus. The primary claw was angled about 45° to the left of the propodus near the primary dactyl. The angle of the extra dactyls and the primary claw was about 90°. The extra dactyls a and b of Figure 3 are hereafter called "extra dactyl a" and
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
