part_of adult spermatocyst adult primary spermatocyte Fig. 17-17, Fig. 17-18, in Biology of Ticks ISBN:0-19-505910-7. TADS:0000514 TADS:0000514 These cells appear in late stage nymphs of argasid ticks and during nymphal development (following feeding) in ixodid ticks. Primary spermatocytes undergo the great growth phase in Prostriate and argasid ticks without the need for feeding. They transform into prospermia (spermatids) which have undergone reduction division. default_namespace cell