Supernumerary Double Legs in Coleoptera

But in the only set of cases where this deduction can be tested, facts clearly do not fit the hypothesis. The cases are those of supernumerary pairs of appendages in beetles. About a hundred such cases were known in 1894, and of these Bateson156 describes about half and figures thirteen.

The formal relations are remarkably uniform and leave no doubt that a single type of explanation should apply to the symmetry in all cases.

156 W. Bateson, Materials . . . , op. cit., pp. 477-503.

Fig. 1 Carabus scheidleri, No. 736. The normal right fore leg, R, bearing an extra pair of legs, SL and SR', arising from the ventral surface of the coxa, C. Seen from in front. (The property of Dr. Kraatz.) From Bateson, W., Materials for the Study of Variation, London:

Fig. 2 Pterostichus muhlfeldii, No. 742. Semidiagrammatic representation of the left middle tibia bearing the extra tarsi upon the antero-ventral border of the apex. L, the normal tarsus; R, the extra right; L' the extra left tarsus. ( The property of Dr. Kraatz. ) From Bateson, W., Materials for the Study of Variation, London: Macmillan, 1894, p 485.

Fig. 2 Pterostichus muhlfeldii, No. 742. Semidiagrammatic representation of the left middle tibia bearing the extra tarsi upon the antero-ventral border of the apex. L, the normal tarsus; R, the extra right; L' the extra left tarsus. ( The property of Dr. Kraatz. ) From Bateson, W., Materials for the Study of Variation, London: Macmillan, 1894, p 485.

Fig. 3 Symmetry of a doublet occurring in the dorsal region.

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