G. Malmberg et Y. Lilliemarck, SPERM ULTRASTRUCTURE OF ISANCISTRUM-SUBULATAE (PLATYHELMINTHES, MONOGENEA, GYRODACTYLIDAE), Folia parasitologica, 40(2), 1993, pp. 97-98
Spermatozoa of Isancistrum subulatae have an ultrastructure with two a
xonemes of the 9 + 1 type, in parallel with the nucleus and one mitoch
ondrion. In the released Isancistrum spermatozoa the nucleus and mitoc
hondrion may have a rather circular cross-section. No cortical microtu
bules were established. The ultrastructure of the Isancistrum spermato
zoa thus corresponds to sperm pattern 2, according to Justine et al. (
1985).