Palaeonemertea is a class 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.
The group includes genera such as Cephalothrix in which the nerve cords are inside the body-wall longitudinal muscle, and Tubulanus, in which the nerve cords are between the outer circular muscle and the epidermis. Tubulanids are commonly encountered in rocky areas of intertidal zones in the northern hemisphere. They are often bright orange or have very distinctive banding and or stripes and can be many metres long, although only a few millimetres thick.
^Hubrecht A. A. W. (1879). "The genera of European nemerteans critically rivised, with descriptions of several new species". Notes from the Leyden Museum. 1: 193–232.
^Cite error: The named reference Chernyshev2021 was invoked but never defined (see the help page).
Palaeonemertea is a class of primitive nemertean worm. It may be para- or polyphyletic, consisting of three to five clades and totalling about 100 species...
without stylet, and a mouth underneath and behind the brain. Order Palaeonemertea. Comprises 100 marine species. Their body wall has outer circular and...
Tubulaniformes is an order of worms belonging to the class Palaeonemertea. Families: Callineridae Bergendal, 1901 Carinomellidae Chernyshev, 1995 Tubulanidae...
classifications. Anopla is divided into two orders: Palaeonemertea and Heteronemertea. Palaeonemertea may be para- or polyphyletic, consisting of 3-5 groupings...
Macrodasyida Phylum Nemertea Class Anopla Order Heteronemertea Order Palaeonemertea Class Enopla Order Bdellonemertea Order Hoplonemertea Lophophorata (unranked)...
Carinomidae is a family of worms belonging to the order Palaeonemertea. Genera: Carinoma Oudemans, 1885 Carinomella Coe, 1905 Statolitonemertes Korotkevich...
Hubrechtiidae is a family of worms belonging to the order Hubrechtiiformes. Norenburg, J.; Gibson, R.; Herrera Bachiller, A.; Strand, M. (2021). "Hubrechtiidae"...
Tubulanus is a genus of primitive nemertean worms in the order Palaeonemertea. The World Register of Marine Species includes the following species in the...
Tubulanidae is a family of primitive nemertean worms in the order Palaeonemertea. Worms in this family have slightly flattened, rounded heads and approximately...
Cephalothricidae is a family of worms belonging to the order Palaeonemertea. Genera: Astemma Örsted, 1843 Balionemertes Sundberg, Gibson & Olsson, 2003...
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