Some observations on the Biology and Structure of Ornithodorus savignyi, Andouin

Abstract

1. The biology, as studied under laboratory conditions, of O. savignyi is very similar to that of O. moubata.2. Females may oviposit over 400 eggs, of which at least 60 per cent, may be fertile; parthenogenesis does not occur.3. An increase in temperature of 8° C. (from 22° C.) decreases the longevity of the female from 775 to 358 days, i.e. by 45 per cent.; an increase of 7° C. (from 30° C.) reduces the period required for the production of third stage nymphs by 26 per cent. At 30° C., the mean minimum periods required for metamorphosis are 60 days for males and 73 days for females (cf. O. moubata, 36 days for males and 45 days for females). Reproduction was inhibited at 37° C.4. Moisture is an unfavourable factor, decreasing the vitality of the individual at each stage of growth.5. Changes in external anatomy undergone during development are similar to those already described for O. moubata.