(1) The karyotype of 0. savigny is described for the first time.
(2) The chromosome number of both male and female is 2n = 20.
(3) The presence of sex-chromosomes in the genus Ornithodoros is confirmed.
The journals have been scanned in colour with a HP 5590 scanner; 600 dpi. Adobe Acrobat v.11 was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.