The relationship between total length and tooth size in Dalatias licha (Bonnaterre, 1788) (Fig. 2.) was examined. Ten sharks were collected from Tokyo Bay. The jaws were separated from each shark (Fig. 3), and a single lower symphysial tooth was taken from the second row and its size was determined (Fig. 4). The measurement results are shown in Figure 1. The linear equation X = (Y-2.07)/0.107 was obtained for the measurement results.

Fig. 1. Relationship between the totall length of Dalatias licha (Bonnaterre, 1988) and the size of its tooth.

Fig.2. Dalatias licha

Fig.3. Jaw of D. licha, male 114 cm T.L.

Fig. 4. All symphysial teeth used for this measurement

Fig. 5. Even for lower teeth other than symphysial teeth, the size of the symphysial tooth can be deduced from the figure below if the characteristics of its morphology are known.

ver.2.1. 20241028, 20231127, ver.1. 20101201

I. Dalatias .II. Size

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