Ringleiste
A structure found in the genus Aulacoseira. The ringleiste is an internal silica ledge that projects into the cell interior from the collum. The ringleiste is variously developed in different Aulacoseira species.
Alternative Term
sulcus
The term sulcus is sometimes used, particularly with A. ambigua. The hollow ringliste may be called a 'U-shaped sulcus'.
Citations
Barber, H.G. and Hayworth, E.Y. (1981). Guide to the Morphology of the Diatom Frustule. Freshwater Biological Association, 112 pp.
Image Credit: Marina Potapova
Light micrograph of ringleiste of Aulacoseira lirata. Ringleiste is well developed and prominent.
Image Credit: Marina Potapova
Scanning electron micrograph the characteristic hollow ringleiste of A. ambigua.
Image Credit: Marina Potapova
Scanning electron micrograph showing internal mantle of Aulacoseira alpigena with a distinct ringleiste.