Any of various primitive elongated freshwater or anadromous fishes of the family Petromyzontidae, characteristically having a jawless sucking mouth with rasping teeth.
七鳃鳗，八目鳗一种七鳃鳗科的原始细长淡水或溯河产卵鱼，特点是长有无。
2
Objective: To evaluate the effect of segmental arch technique and implant reinforcing anchorage on depressing the elongated opposed teeth for preparing enough space for mandibular dental implant.
目的：探讨片段弓技术联合部种植支抗压低上颌磨牙，为下颌牙缺失的种植修复提供足够的合间距离。
3
Three pairs of incisors, one pair of elongated canines, three pairs of molars, four pairs of premolars, upper and lower, for a total of 44 teeth.