Having notably more length than width. Having a long and slender shape.
Native, or limited to a specific geographic area.
Algae which grow within the subsurface of sediments, clays, and silt.
An organism that lives inside another, benefitting both individuals. For example, endosymbiotic cyanobacteria often inhabit living cells of the genus Epithemia.
Algae which grow on the surface of rock or stone.
Algae which grow on the surface of sediments, clays, and silt, i.e., residing at the water/sediment interface.
The growth habit of organisms that live on the surfaces of plants or other algae.
The growth habit of living attached to sand grains, or moving through sand.
The larger theca of the frustule. The epitheca overlaps the hypotheca. A theca is composed of a valve and its associated cingulum. From Greek, theca means sheath or case (plural is thecae), so epitheca means outer sheath.
A tube-like extension of the fultoportula on the valve face, typically a simple tube, but may also be variously shaped.