Methods: The morphology, syntopy and projection on lateral nasal wall of the dacryocyst, and bony thickness of medial wall of fassa sacci lacrimalis were observed on the median sagittal planes of 30 adult head specimens. 方法:在30侧成人头部正中矢状剖面标本上,观测了泪囊的形态、毗邻、在鼻腔外侧壁上的投影及泪囊窝内侧壁骨质厚度。
The genus includes 27 species which can be divided into five groups according to the contact relationship between sacci and body and their relative size. 该属有近27种,依据气囊与本体的着生关系及其相对大小分成双束松、单束松、雪松、云杉和罗汉松型五个组,再结合帽上的纹饰、发育程度来区分。