Two alternate forms have been described in the keys: forma blanchardi, which lacks hairs and pectinate chaetae, instead having only bifid dorsals and forma bergi, which has mildly pectinate dorsal chaetae and sparse hair chaetae. There may be many cryptic species represented by T. Some species in the genus have been moved to Tasserkidrilus, and one from Tasserkidrilus now belongs to Varichaetadrilus (Timm 2006). There have been many revisions to Tubifex over the years. The shape of the penis sheaths may seem like a vase or bulb with a reflexed hood, but the granulations should be evident regardless of the shape of the short penis sheath. Anterior ventral bundles contain 3–6 or more chaetae which decreases to 2 posteriorly, and the upper tooth is as long as but thinner than the lower tooth there is sometimes a small intermediate spine. There are 3–5 pectinate chaetae and 1–6 hairs which may be hispid in the dorsal bundles. This species has short, tub-shaped granular penis sheaths.
It is a tubificid worm that has dorsal bundles with hairs and pectinate chaetae and bifid ventral chaetae beginning in II. Tubifex tubifex (Müller, 1774) is a freshwater oligochaete worm that is common in the Great Lakes.
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