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FURTHER STUDIES ON THE PRODUCTION OF FUNCTIONAL AND RUDIMENTARY SPERMATOZOA IN ROTIFERS

1918; Marine Biological Laboratory (MBL); Volume: 34; Issue: 5 Linguagem: Inglês

10.2307/1536449

1939-8697

D. D. Whitney,

Aquatic Ecosystems and Phytoplankton Dynamics

1. The normal and motile spermatozoa of Brachionus mulleri, Brachionus amphiceros, Hydatina senta and Diaschiza sterea possess large heads in which is located the chromatin material. 2. The motile bodies of seven other species of rotifers which were figured and considered as the normal spermatozoa in the former paper were probably only the tails of such normal spermatozoa. 3. The degenerate and immotile spermatozoa as seen in Brachionus mulleri and Hydatina senta also possess heads in which there is chromatin material. 4. The stiff processes, called rudimentary spermatozoa in the former paper, are now considered to be not the complete rudimentary spermatożoa but only the degenerate tails of these rudimentary spermatozoa. 5. The sperm head in the fertilized egg of Hydatina senta is about the same size as the head of the normal spermatozoön of this species. 6. The four species of rotifers enumerated above together with the seven other species described in the former paper constitute eleven species of rotifers in which both normal and rudimentary spermatozoa have been found to occur.