A COMPARATIVE STUDY OF SPERM POSTPAWNING DESTRUCTION IN FLATFISHES HIPPOGLOSSOIDES
(CLEISTHENES) HERZENSTEINI AND HIPPOGLOSSOIDES DUBIUS (TELEOSTEI, PLEURONECTIDAE)
A. A. Reunov,1 S. Y. Neznanova,2 V. N. Ivankov2
1 Institute of Marine Biology FEE RAS, and
2 Far Eastern State University, Vladivostok, Russia;
1 e-mail: arkadiyj-eunov@hotmail.com
Ultrastructural aspects of sperm destruction patterns were offered as additional cytological parameters for evaluation
of the genus affinity of flatfishes Hippoglossoides dubius and Cleisthenes herzensteini. At the beginning of spermatozoan
destruction, cell membrane in both species was found swollen, besides, discontinuity of membranes was observed, and membraneous
parts were seen separating from sparmatozoa. We observed the ability of separated membraneous parts to aggregate to twisting
conglomerates that wind round the objects of destruction. In H. dubius the membraneous conglomerates wound round spermatozoa,
and after that such spermatozoa were phagocyted by follicular cells. In C. herzensteini, the membraneous conglomerates grasped
the particles of destructed spermatozoa: the formed residual bodies were collected in the gonad lumen but not phagocyted by follicular cells.
The expressiveness of the differences found in the pattern of sperm destruction is so considerable that, in the authors' opinion, these
data are to supplement a list of criteria making reasonable reconsideration of the taxonomic status of C. herzensteini: its belonging
to the genus Hippoglossoides, and establishing of the genus Cleisthenes as an independent rank.
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