Revision of the genera of Heligmonellidae (Nematoda, Heligmosomoidea), parasitic in Muridae from New Guinea Author Durette-Desset, Marie-Claude Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum National d’Histoire Naturelle, CNRS, Sorbonne Université, Author Digiani, María Celina CONICET-Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina & División Zoología Invertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, text Parasite 2023 Paris, France 2023-12-20 30 63 1 34 http://dx.doi.org/10.1051/parasite/2023058 journal article 10.1051/parasite/2023058 1776-1042 PMC10732140 38117273 12628842 DC25665A-E218-496B-974E-B813F69395E5 3.1 Genus MELOMYSTRONGYLUS Smales, 2009 ( Fig. 1 ) Type species: Melomystrongylus sepikensis Smales, 2009 . Hosts: Muridae , Hydromyinae ( Rodentia ). Site: small intestine. Distribution: Papua New Guinea . Other species: Melomystrongylus somoroensis Smales & Heinrich, 2010 . Original diagnosis: Trichostrongyloidea : Heligmonellidae : Nippostrongylinae . Synlophe well developed with pointed ridges; in midbody axis of orientation of ridges passing through ventral right and dorsal left sides inclined about 65 ° from sagittal axis in anterior body, lacking clear orientation in mid and hind body. Ventral ridge 5’ hypertrophied anteriorly. Bursa asymmetrical with larger left lobe. Dorsal ray divided distal to level of branching of rays 8 from dorsal trunk. Parasites of hydromyine murids [ 30 ].