后肛鱼 Opisthoproctussoleatus (Vaillant, 1888)科 hòu gāng yú

后肛鱼，学名：Opisthoproctus soleatus (Vaillant, 1888)，为后肛鱼科后肛鱼属的一种深海鱼类。全长可达10.5厘米，体侧和腹面有大而薄的圆鳞，易脱落；头部裸露。尾鳍分为上下2部分。体褐色；头侧具金属光泽；眼黑色；鳍无色。 许多微明带的鱼都具有筒状眼镜，其结构适于向上观察海面，以期来自那里的残余光线可以勾勒出猎物的轮廓。这种眼睛存在的问题是侧向视力不佳。为弥补这一点，这些鱼种有的具有非常大的视网膜，使它们能够看到侧面和下面。隶属后肛鱼科，后肛鱼属（本属共2种）。

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Adiacanthus Fasciola (Peters, 1877) is a fish of the genus Oxytropis in the family macrostomatidae. It is distributed in Taiwan Island and other places. The female can be up to 27 cm long, while the male is only 4 cm long. The odd ratchet lives on the bottom of the sea 500 meters below the water. There is little food there. In such a bad environment, the odd ratchet only opens its big mouth and snares every bit of food. The jaw of a chiropractic can be extended forward to swallow prey larger than it. Posterior anal fish, scientific name: opisthoproctus soleatus (Vaillant, 1888), is a deep-sea fish of the genus posterior anal fish of the posterior anal fish family. The total length can reach 10.5cm. There are large and thin round scales on the side and abdomen, which are easy to fall off; Bare head. The caudal fin is divided into upper and lower parts. Body brown; The head side has metallic luster; Black eyes; The fins are colorless. Many of the fish in the twilight zone have cylindrical glasses, which are structured to look up at the sea surface in the hope that the residual light from there can outline the prey. The problem with this eye is poor lateral vision. To compensate for this, some of these species have very large retinas that enable them to see the side and below. It belongs to the posterior anal fish family and belongs to the genus posterior anal fish (2 species in this genus).