Description of Ophrydium sessile
provided by BioPedia
Peritrich ciliate, colonial, in gelatinous matrix, bodies hyaline, colourless or of a slightly brownish hue, attenuate, subcylindrical, truncate or tapering posteriorly, sometimes slightly inflated centrally, attached immediately without a peduncle. The cuticular surface finely annulate transversely. Cells forming small hemispherical masses of closely packed individuals not exceeding one-eighth of an inch in diameter. Length of extended bodies about 300 microns.
