|African green monkey Chlorocebus aethiops
|Sakka L, Coll G, Chazal J. Anatomy and physiology of cerebrospinal fluid. Eur Ann Otorhinolaryngol Head Neck Dis. 2011 Dec128(6):309-16. doi: 10.1016/j.anorl.2011.03.002 p.312 left column bottom paragraphPubMed ID22100360
| Welch K, Pollay M. The spinal arachnoid villi of the monkeys Cercopithecus aethiops sabaeus and Macaca irus. Anat Rec. 1963 Jan145: 43-8PubMed ID13999821
|Primary source abstract: "The spinal arachnoid villi have been studied in the monkey by the examination of serial sections of spinal nerve roots, particular attention being paid to the relations of the arachnoid to the dura mater and to the veins which are regularly applied to the emerging roots."
|P.312 left column bottom paragraph: "In the Green Monkey, arachnoid villi reach the epidural space and penetrate into the wall of veins situated around the spinal ganglion in about 16% of spinal roots [primary source]."