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| Larva(Tokyo Met.) | The egg sack that shines pale blue in underwater.(Tokyo Met.) |
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| Egg sack(Western Japan) | Egg sack(Tokyo Met.) |
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| Elongatively and the curve is loose. | Thickly and the curve is hard. |
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| Large size:Shimane Pref.(22cm),Small size:Kinki area(13cm) | Tokyo Met. (Even the individual without the spot is.) |
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| Adult(Kyoto Pref.) | Sub adult(Kyoto Pref.) |
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| General inhabitant environment |
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| Incubation(Egg sack inside) | Immediately after incubation |
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| Stare the size of the gills. | |