Exploring the basal topology of the heteronemertean tree of life: establishment of a new family, along with turbotaxonomy of Valenciniidae (Nemertea: Pilidiophora: Heteronemertea) Author Kajihara, Hiroshi Author Abukawa, Shushi Author Chernyshev, Alexei V. text Zoological Journal of the Linnean Society 2022 196 503 548 journal article 10.1093/zoolinnean/zlac015 372f8265-c53c-43fa-9448-07d5a58d311f 0024-4082 7037958 78C56409-FCCF-4116-8D8C-FF66B247C56C OXYPOLELLA HIEBERTAE SP. NOV. ( FIG. 2B ) Oxypolellinae gen. sp.: Hiebert, 2016: 318 . Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org:act: 1F5D91AE-5C57-4E9A-BE20-C05D2DA554B4 . Material examined: Four specimens, all collected by A. V . Chernyshev. Holotype , MIMB 42256 , 23 May 2007 , among dead corals, 2–4 m depth , Cù-Lao Ré Island ( 15°23′N , 109°05′E ), Vietnam . Other material : two specimens , 19 May 2007 , among dead corals, 5–7 m depth , Bach Long Vi Island ( 20°09′N , 107°44′E ), Vietnam ; one specimen , 22 May 2010 , intertidal, among calcareous red algae, Van Phong Bay ( 12°40′N , 109°20′E ), Vietnam . Sequence: From the holotype ; KU748595 , 16S (524 bp), determined by Hiebert (2016) as Oxypolellinae sp. TCH-2017 isolate E4H7. Etymology: The new specific name, a noun in the genitive case, honours Dr Terra C. Hiebert for her outstanding contribution to nemertean systematics. Description: Body soft, 2–4 cm long, 1 mm wide, dorsally yellow or lemon yellow, ventrally pale yellowish; head long, narrow, with two thin transverse furrows in front of mouth; eyes and caudal cirrus absent ( Fig. 2B ). Rhynchopore ventral. Mouth small, pit-like. Rhynchocoel extending length of body. Two regions detected in proboscis of live specimens. Frontal organ present (from CSLSM observation; data not shown). Body wall with two dorsal nerves (from CSLSM observation; data not shown). Living worms with distinctive, permanent mucous tube. Distribution: Known only from Vietnam (present study). Remarks: Oxypolella hiebertae is the sixth member described in the genus (cf. Cantell, 2005 ). It resembles the most recently described species, Oxypolella banyulensis Cantell, 2005 from the Mediterranean, in having yellowish body colour. Oxypolella hiebertae differs from O. banyulensis in having cephalic furrows as well as in the body coloration; in O. hiebertae , the body is uniformly yellow, whereas in O. banyulensis , the anterior third of the body is white and the posterior two-thirds yellowish white.