PECULIARITIES OF SPONGE HALISARCA DUJARDINI (DEMOSPONGIAE, HALISARCIDA) LARVAL CELLS.
I. SEPARATION OF CELLS AND THEIR AGGREGATION PROPERTIES
Yu. I. Mukhina, O. I. Podgornaya, S. M. Efremova
St. Petersburg State University and Institute of Cytology RAS, St. Petersburg;
e-mail: sophia.efremova@pobox.spbu.ru
The majority of Demospongia members have a parenchymula larva, whose inner cells are similar to definite sponge cells.
There are some contradictory opinions about the structure of larva in the marine sponge Halisarca dujardini: some authors deny
the presence of inner cells, while other investigators consider this larva as a real parenchymula. We defined the larval cell types by cell
separation in the percoll gradient and analysed their morphology and behaviour. The results showed the existence of 6 cell types in the
parenchymula larva of H. dujardini, including 2 types of external flagellated cells. Each cell category differs in its morphology and
aggregation ability.
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