Description
An illustration of the various types of earthworm setae. Seta (plural: setae) is a biological term derived from the Latin word for "bristle". It refers to a number of different bristle- or hair-like structures on living organisms. "A, penial seta of Perichaeta ceylonica; b, extremity of penial seta of Acanthodrilus; c, Seta of Urochaeta; d, Seta of Lumbricus; e, Seta of Criodrilus; f, g, Setae of Bohemilla comata; h, i, j, Setae of Psammoryctes barbatus." (Britannica, 1910)
