These diatoms can be found as single cells or in short chains. They are characterized by numerous small chloroplasts and a prominent elongated central spine. They are triangular prism-shaped and encased in a protective siliceous shell called a frustule. These diatoms range in size from 40 to 300 micrometers in length and 14 to 120 micrometers in diameter. They are typically yellow-brown in color, which is common for diatoms.Reproduction in these diatoms can occur through both sexual and asexual means. They can produce resting spores, which are a form of dormant stage that allows them to survive adverse environmental conditions. They also produce microspores.