a1 Department of Parasitology, Faculty of Pharmacy, Sevilla University, Sor Gregoria de Sta. Teresa, 41012 Sevilla, Spain
C-banding has been performed on Dictyocaulus filaria using both original and modified techniques. The karyotype is reported based on C band observations. The existence of large heterochromatic blocks appears to be the cause of the low chiasmata frequency.
(Accepted November 22 1989)