@article{oai:ir.kagoshima-u.ac.jp:00008299,
 author = {TSUKAHARA, Junzo},
 journal = {南太平洋海域調査研究報告=Occasional papers},
 month = {2016-10-28},
 note = {Morphological changes in the formation of spermatozoa of Nautilus belauensis in
Palau were studied. The nucleus undergoes considerable elongation during early
spermiogenesis and is surrounded by extensive microtubules to make the manchette
structure. The mitochondria migrate to one pole of the secondary spermatocyte to become
two mitochondrial masses which elongate and eventually lie in two grooves of the
nuclear envelope on the opposite side of the nucleus. The acrosomal complex is a
pointed apical sac. The complex contains anterior and posterior acrosomal rods and an
irregular vesicles situated in the front tip of the nucleus. At the posterior end of the
nucleus proximal and distal basal bodies lie parallel in the basal body fossa. Each basal
body is composed of nine sets of doublet microtubules. These morphological features
are compared with the ultrastructure of Nautilus pompilius in the Philippines, Fiji and Papua New Guinea and it is suggested that the differences found among them are not
considerable enough to distinguish the species.},
 pages = {65--75},
 title = {Ultrastructural Changes in the Formation of Spermatozoa of Nautilus belauensis in Palau},
 volume = {27},
 year = {}
}