Palaeonemertea is an order of primitive nemertean worm. It may be para- or polyphyletic, consisting of three to five clades and totalling about 100 species.

These worms have several apparently simple features and, as their name suggests, they are often considered to be the most primitive nemerteans. The primary body-wall musculature consists of an outer circular layer overlying a longitudinal layer.

Palaeonemertea. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Palaeonemertea.

Tubulanidae is a family of primitive nemertean worms in the order Palaeonemertea.

Tubulanidae. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Tubulanidae.

Tubulanus is a genus of primitive nemertean worms in the order Palaeonemertea.

Tubulanus. Retrieved May, 08 2021, from en.wikipedia.org/wiki/Tubulanus.