Ultrastructure of spermatozoa of two species of Myctophidae; Symbolophorus californiensis and Notoscopelus sp
Japanese Journal of Ichthyology 54(1): 41-46
ISSN/ISBN: 0021-5090 Accession: 017587767
The ultrastructure of spermatozoa of two species of Myctophidae, Symbolophorus californiensis and Notoscopelus sp., was examined by scanning and transmission electron microscopes. The spermatozoa were characterized by (1) numerous small spherical mitochondria distributed in close contact with the nuclear membrane covering on S-shaped nucleus of ca 5 mu m (L) X ca 1 mu m (W), (2) two centrioles located about 1/3 along the long axis of the nucleus, giving rise to typical biflagellarity, and (3) biflagella ca 47 pm long, each component with an unusual 9+0 axonemal structure. It is suggested that a combination of these three apomorphic characters may be peculiar to Myctophidae.