Corononema vulgare sp. n. and Hofmaenneria coralis sp. n. (Nematoda, Monhysterida) from coral reefs off the coast of Vietnam Author Phuong, Nguyen Thi Xuan 0000-0001-8911-014X Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & Graduate University of Science and Technology, Vietnam Academy of Sciences and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & ntxphuong. iebr @ gmail. com; https: // orcid. org / 0000 - 0001 - 8911 - 014 X ntxphuong.iebr@gmail.com Author Long, Phan Ke 0000-0003-4998-260X Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & Graduate University of Science and Technology, Vietnam Academy of Sciences and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & pkelong @ gmail. com; https: // orcid. org / 0000 - 0003 - 4998 - 260 X pkelong@gmail.com Author Thanh, Tran Thi Viet 0000-0002-2381-5873 Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & thanhbttnvn @ gmail. com; https: // orcid. org / 0000 - 0002 - 2381 - 5873 & Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Yaroslavl Province, Borok, 152742, Russia. Laboratory of Coastal Benthic Ecology, P. P. Shirkov Institute of Ecology, Russian Academy of Sciences, Russia. & gagarin @ ibiw. yaroslavl. ru; https: // orcid. org / 0009 - 0003 - 4817 - 8238 & vadim @ ocean. ru; https: // orcid. org / 0009 - 0003 - 2873 - 0638 thanhbttnvn@gmail.com Author Tu, Nguyen Dinh 0000-0002-1829-3636 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & Graduate University of Science and Technology, Vietnam Academy of Sciences and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Hanoi, Vietnam. & ngdtu @ yahoo. com; https: // orcid. org / 0000 - 0002 - 1829 - 3636 ngdtu@yahoo.com text Zootaxa 2023 2023-11-28 5380 1 67 76 https://mapress.com/zt/article/download/zootaxa.5380.1.5/52359 journal article 10.11646/zootaxa.5380.1.5 1175-5326 10212692 1F31D83F-BDFD-4832-8858-4F9A0A0ACA8A Genus Corononema Nicholas & Stewart, 1995 Diagnosis (modified after Nicholas & Stewart 1995 ). Cuticle prominently annulated with eight longitudinal ridges or ridges absent. Lips high, deeply incised. Deep groove around the head just posterior to the insertion of six inner labial setae, in front of outer labial and cephalic setae, sets off the lip region from the slightly tapered pharyngostoma. Pharyngostoma spacious, in the shape of cylinder with strongly cuticularised walls.Amphidial fovea circular, located at the level of pharyngostoma. Spicules strongly curved ventrally, cephalated. Gubernaculum small, without dorsal apophyses. Precloacal supplements absent.