Hall J E, Haines D E, Frederickson R G
J Med Primatol. 1985;14(4):195-208.
A Pentastomid nymph of the genus Porocephalus was identified following its removal from the brain-meningeal interface of a squirrel monkey, Saimiri sciureus. It was characterized by two inner and two outer hooks adjacent to the mouth opening, the presence of accessory lobes (or spines) on the outer hooks, a vertical slit-like mouth opening surrounded by a U-shaped conformation of integument, and annulation of the body surface. Stigmata, representing the openings of integumental chloride cells, were present on the dorsum of the head and tail, on anterior aspects of annulae on the body, and on anterior and posterior edges of annulae located on the ventral surface of the tail. These openings were not present on integumental folds at the bases of the inner and outer hooks, on the dorsal aspect of the tail flap, or in the deep grooves separating annulae. Although it was not possible to determine the species, based on the number of annulae this specimen may represent P. stilesi.
从松鼠猴（松鼠猴属）脑-脑膜界面取出的一个五口虫若虫被鉴定为孔头虫属。其特征为：靠近口部有两个内钩和两个外钩，外钩上有副叶（或刺），垂直的裂缝状口部被U形体表结构包围，体表有环纹。气门代表体表氯化物细胞的开口，位于头部和尾部背面、身体环纹前部以及尾腹面环纹的前后边缘。在内钩和外钩基部的体表褶皱处、尾瓣背面或分隔环纹的深沟中没有这些开口。尽管无法确定其物种，但根据环纹数量，该标本可能代表斯氏孔头虫。
