球吻鼻鱼 Naso tonganus qiú wěn bí yú

球吻鼻鱼，Naso tonganus 体呈长椭圆形而侧扁；尾柄部有二个盾状骨板，各有一个龙骨突。头小，随着成长，在眼前方之额部逐渐突出而形成瘤状突起，且背部亦会隆起。口小，端位，上下颌各具一列齿，齿稍侧扁且尖锐，两侧或有锯状齿。背鳍及臀鳍硬棘尖锐，分别具V棘及II棘，各鳍条皆不延长；尾鳍截平，上下叶缘不延长如丝。体呈灰色，腹面灰黄色，瘤状突起的背面及其后方体侧具大片污斑及污点，有时不显著；胸鳍与尾鳍均具黑缘。

百度翻译提供：

Naso tonganus is a long oval fish with flat sides; There are two shield bone plates at the tail handle, each with a keel process. The head is small. As it grows, it gradually protrudes in front of the forehead to form a tumor like protrusion, and the back will also bulge. The mouth is small, with an end position. The upper and lower jaw have a row of teeth respectively. The teeth are slightly flat and sharp, with saw teeth on both sides. Dorsal fin and gluteal fin hard spines are sharp, with V spines and II spines respectively, and each fin ray is not extended; The caudal fin is cut flat, and the upper and lower leaf margins do not extend like silk. The body is gray, the ventral surface is grayish yellow, and there are large stains and stains on the back of the tumor like protrusion and its rear body side, sometimes not significant; Both pectoral and caudal fins have black margins.