page_title: Pinnularia
section_title: Reproduction
hierarchical_section_title: Pinnularia / Reproduction
caption_attribution_description: Deutsch: Gürtelbandansicht Pinnularia sp., in Teilung, Teich im Wald des Furlbachtals, Juni 2009
context_page_description: Pinnularia is a genus fresh water alga more specifically a type of diatom.
context_section_description: Pinnularia like most diatoms, can reproduce by simple cell division. Nuclear division occurs by mitosis and cell divides into two parts. Each daughter receives one of the parent cell's thecae, which becomes that cell's epitheca. The cell then synthesizes a new hypotheca. Thus one daughter is the same size as the parent, and one is slightly smaller. With subsequent generations the average cell size of a Pinnularia population gradually becomes smaller. When a minimum average size is reached auxospore formation occurs and sexual reproduction restores the population's average cell size.
caption: Pinnularia diatom during reproduction (cell division)
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