Sperm winding in Collembola
| Autor: | Romano Dallai, Francesco Frati, Eugenio Paccagnini, Pietro Paolo Fanciulli, Pietro Lupetti |
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| Rok vydání: | 2004 |
| Předmět: |
insect spermatozoa
spermatofore Spermatozoon Spermatid urogenital system sperm ultrastructure indirect sperm transfer Soil Science Anatomy Biology Sperm medicine.anatomical_structure Evagination Cytoplasm Spermatophore medicine Extracellular Biophysics Process (anatomy) Ecology Evolution Behavior and Systematics |
| Zdroj: | Pedobiologia. 48:493-501 |
| ISSN: | 0031-4056 |
| DOI: | 10.1016/j.pedobi.2004.05.007 |
| Popis: | Summary The winding process leading to the formation of rolled-up spermatozoa in Collembola is described. It is a phenomenon common to all collembolan species examined so far and it starts with the organization of a cytoplasmic flattened evagination beneath the head of the elongated spermatid, which gives rise to an extracellular cavity. Within this cavity secretory material produced by the epithelial cells of testes is progressively stored. The spermatozoon, whose cytoplasm is reduced to a thin layer, enrolls around this material. The final appearance is that of a spheroidal or lenticular structure containing dense material in the central extracellular cavity; this cavity is surrounded by the flattened sperm in whose cytoplasm the sperm components forms several spires. The material into the extracellular cavity becomes progressively denser and has a different appearance in the species examined. |
| Databáze: | OpenAIRE |
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