Russian Journal of Marine Biology, Vol. 26, No. 5, 2000, p. 388. Original Russian Text Copyright 9 2000 by Bwlogiya Morya, Selin, AN INTERESTING FINDING N. I. Selin Institute of Marine Biology, Far East Division, Russian Academy of Sciences, ul. Pal'chevskogo 17, Vladivostok, 690041 Russia A characteristic feature of the organization of the had developed and grown normally, as evidenced by its members of the family Majidae (Crustacea: Decapoda) body size, which was close to the average value for the is the presence of five pairs of walking limbs located examined aggregation of this species (the carapace symmetrically on either side of the body. This morpho- width was 98.3 and 98.0 + 6.4 mm, respectively), the logical feature visually distinguishes these species bilateral symmetry of the body characteristic of this species, and by eggs on the pleopods, which were typi- from the crabs of the family Lithodidae, which have four pairs of functionally analogous limbs. cal in volume and development for the time of year. In August 1999, during population biology research If the finding of the female with nine walking limbs on the western Kamchatka aggregations of crabs in the is an example of the discovery of a mutant, it might be Sea of Okhotsk, together with normal individuals, a interesting to find out at what stage of development the morphologically peculiar female Chionoecetes bairdi structure diverged and how many crabs have such struc- tanner crab was caught in a conical crab trap of the Jap- tural deviations, and to elucidate the cause of this muta- anese type at a depth of 82 m at 52 ~ 17' N, 155 ~ 50' E. tion. These questions remain unanswered. Let us only Its distinctive feature was the presence of only four note that, of about 50000 examined C. bairdi crabs, walking limbs on the right side of the body. Since the there was only one animal with such a body structure. symmetrically located limbs are normally equal in size, we can, with a certain assuredness, assume that the fifth REFERENCES leg of the female was absent. It is known that, in nature, crabs often lack one, two, 1. Edwards, J.S., Limb Loss and Regeneration in Two or even more than half of their limbs [1, 2]. However, Crabs: the King Crab Paralithodes camtschatica and the most of these are autotomies that result from various Tanner crab Chionoecetes bairdi, Acta Zool., 1972, vol. 53, no. 1, pp. 105-112. accidents, and the basis and part of the ischium are usu- ally retained, while the rest of the thoracic appendage is 2. Ivanov G.B. Limb Injuries in Crabs in the Western Ber- lost . In the caught female tanner crab, none of these ing Sea (Crustacea Decapoda: Brachiura Majidae, Ano- traces of a lost limb were observed. It is possible that mura Lithodidae), Arthr. Selec., 1994, vol. 3, nos. 3--4, pp. 33-56. the animal had only 9 legs initially, as the basis, isch- ium, and coxa were all absent. The neighboring part of 3. McVean, A., Autotomy, Biology of Crustacea, New the skeleton showed no traces of trauma. The female York: Academic Press, 1982, vol. 4, pp. 107-132. 9 2000 MAIK "Nauka/Interperiodica" 1063-0740/00/2605-0388525.00
Russian Journal of Marine Biology – Springer Journals
Published: Nov 18, 2007
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