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Index Category
Num Date Index Chg. Chg. %
1 2015-03-22 74.87 0.00 0.00%
2 2015-03-15 74.87 0.00 0.00%
3 2015-03-08 74.87 0.00 0.00%
4 2015-03-01 74.87 0.00 0.00%
5 2015-02-22 74.87 0.00 0.00%
6 2015-02-15 74.87 0.00 0.00%
7 2015-02-08 74.87 0.00 0.00%
8 2015-02-01 74.87 0.00 0.00%
9 2015-01-25 74.87 0.00 0.00%
10 2015-01-18 74.87 0.00 0.00%

特徴

産地:Bullacta exarata is endemic to coastlines of the South and East China Seas from Hainan to the Bohai Sea in north-eastern China, the western coast and south coast of Korea and Japan. An ecotype of this snail introduced from further south has became invasive in Laizhou Bay, with population densities of over 160 snails per square meter.
特徴:Mud snails, was also named Spitting Iron (吐铁) in ancient China. The history book of Wenzhou published in Ming Dynasty says: " Spitting Iron, one type of bullacta exarata, is commonly named Mud Snail. It has black sand in its mouth, and the sand is as black as iron. All of the sand will be spitted out during the peach blossom time. In Wenzhou, it is called Glutinous Mud Snail. it grows in mud and is collected when wheat is ripe. It is also named yellow mud in Jiangsu Province, Zhejiang Province and Shanghai because its shell is yellow and the brine to pickle it is yellow as well.
The shell is bullate, fairly thick, white, spirally striate, with a well-developed periostracum. There is no spire and no umbilicus. The columella is smooth and simple. The aperture extends for the whole length of the shell, and is narrower above than below. The apertural lip extends upwards beyond the apex of the shell.
The height of the shell is 8 mm and the width of the shell is 6 mm.
The animal cannot withdraw itself into the shell, which contains the visceral hump only. The cephalic disc is large and slipper-shaped, feebly emarginate on the dorsal surface behind and with a narrow free margin.
The cephalic disc, which is rounded in front, occupies about half of the whole bulk in a contracted state. The edge of the mantle is smooth, without processes of any kind.[3] It, the edge of the mantle (which is slightly retroverted over that of the shell), the foot and the epipodia are (in alcohol) of a pale green colour. The greater part of the mantle, however, under the shell is colourless and transparent. The foot is short, truncate before and behind, and with the epipodia (in much contracted specimens) apparently not well developed. The eyes are minute and quite invisible on the surface. The eyespots are deeply sunk in the tissues. The gill, which is situated far back on the right side, is large and consists of a considerable number of fleshly lobes.