Ringleiste

An internal, silica ledge that projects into the cell interior from the collum. The ringleiste is found only in the genus Aulacoseira and is variously developed in different species of the genus.

Alternative Terms

sulcus
The term sulcus is sometimes used, particularly with *Aulacoseira ambigua*. The hollow ringliste may also be called a 'U-shaped sulcus'. See the illustration on this page.
Waca22  Aulir3
Image Credit: Marina Potapova
Light micrograph of the well developed and prominent ringleiste of Aulacoseira lirata at the arrow.
A Ambigua Ringleiste
Image Credit: Marina Potapova
Scanning electron micrograph of the characteristic, hollow ringleiste of Aulacoseira ambigua.
A Alpigena Ringleiste
Image Credit: Marina Potapova
Scanning electron micrograph of the internal mantle of Aulacoseira alpigena with a distinct ringleiste.