Phylogenetic Relationships and Taxonomic Position of the Ribbon Worms of the Genus (Nemertea, Palaeonemertea) with Descriptions of Two New Species.

The genus Gibson and Sundberg, 1999 was first described within the family Hubrechtiidae (class Pilidiophora) and subsequently transferred to the family Callineridae (class Palaeonemertea). Here we describe two new species, sp. nov.

An integrative description of a new Cephalothrix species (Nemertea: Palaeonemertea) from the South China Sea.

A new nemertean species of the genus Cephalothrix from intertidal calcareous red algae off the Vietnam coast is described based on histological sections, confocal laser scanning microscopy, and nucleotide sequences of three nuclear (18S rRNA, 28S rRNA, H3) and two mitochondrial (COI, 16S rRNA) DNA fragments. Cephalothrix suni sp. nov.

A histology-free description of a new species of the genus Tetrastemma (Nemertea: Hoplonemertea: Monostilifera) from Hawaii and India.

A new species of the genus Tetrastemma Ehrenberg, 1831, T. freyae sp. nov.