. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EXTRA CLAW ON CHELIPED OF CRAYFISH 57 Tjp. Figure 7. Extracellular recording from nerve trunks in the merus of a cheliped with extra dactyls. Thick bar signifies manual closing of the extra dactyl shown in Figure 3. claws induced in the present study are essentially similar to those naturally occurring ones. The naturally occurring extra claws reported by Cole (1910) and Nakatani el at. (1997) developed from the base of the primary propodus. Lateral outgrowths from experimental incisions devel- oped from the wounded sit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EXTRA CLAW ON CHELIPED OF CRAYFISH 57 Tjp. Figure 7. Extracellular recording from nerve trunks in the merus of a cheliped with extra dactyls. Thick bar signifies manual closing of the extra dactyl shown in Figure 3. claws induced in the present study are essentially similar to those naturally occurring ones. The naturally occurring extra claws reported by Cole (1910) and Nakatani el at. (1997) developed from the base of the primary propodus. Lateral outgrowths from experimental incisions devel- oped from the wounded site on the outer surface of the propodus (Murayama el «/., 1994; Nakatani, 1996). Thus, in the present study, the wound was made at the base of the propodus. However, all of the extra claws or extra dactyls developed on the distal side of the wound. This suggests that the extra claws reported by Cole (1910) and Nakatani el <;/. (1997) were caused by damage at a site more proximal to the extra claw—for example, at the carpus. Although there were no extra propodi, the shape and location of the a pair of extra dactyls observed in this study were similar to those of the naturally occurring one reported by Faxon (1881) on the cheliped of H. ameri- canus. As in the present study, these extra claws devel- oped away from the base of the propodus. The propodi of the extra claws described by Faxon were about one- sixth as long as the extra dactyls, and each was separated from its primary propodus by an articulation. Lateral outgrowths on chelipeds have been assumed to result from the abnormal healing of a natural wound (Su- zuki and Odawara, 1971; Shelton el ai, 1981: Okamoto, 1991; Nakatani el ai, 1992). Many of those outgrowths consisted of a pair of projections without any articulation. The proximal and distal surfaces of the wound each devel- oped one projection, and they faced each other as mirror images (Nakatani, 1996). However, in the present study, the extra dactyls develope
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
