superiorensis have hairs and pectinate chaetae, but have longer, conical penis sheaths.
nerthus is a coastal species that is mainly known for having anterior ventral chaetae with the upper tooth twice as long as the reduced lower tooth. The penis sheath is short and tub-shaped but not granular. ignotus is a long, thin worm rarely found in the Great Lakes, with U-shaped pectinate chaetae and starting in X, the hispid hair chaetae are 2–3 times longer than the diameter of the segment. tubifex could be confused with other members of Tubifex, although they have distinct features that help to separate them. templetoni are long and conical, not short, tub-shaped granular penis sheaths. templetoni have the upper tooth longer than the lower, not equal, and the penis sheaths of I.
Without the presence of reproductive features, many tubificid worm species can only be identified as “immature tubificid with or without hair.” The chaetal structure is similar to Ilyodrilus templetoni, but the anterior ventral chaetae of I. tubifex, and it was recently recognized as a distinct species through genetic analysis (Marotta 2009). blanchardi, which was originally a distinct species until revisions in the 1970s made it a form of T. Over time, some of these forms may be recognized as distinct species, such as T. There also may be some specimens that lack pectinate dorsal chaetae and instead have bifid chaetae with hairs. 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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