What shapes are diatoms and what is their structure?

Diatoms are primarily characterized by their unique, intricate shapes, which can be symmetrical or asymmetrical and often resemble geometric forms such as circles, ovals, or elongated shapes. Their structure consists of a silica-based cell wall called a frustule, which is made up of two interlocking halves that fit together like a petri dish. The frustule features ornate patterns and pores that serve various functions, including gas exchange and nutrient uptake. These microscopic organisms are key components of aquatic ecosystems, contributing to primary production and serving as a food source for various marine life.