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 3.3 Genus MONTISTRONGYLUS Smales & Heinrich, 2010 ( Fig. 3 ) Type species: Montistrongylus ingati Smales & Heinrich, 2010 . Hosts: Muridae , Murinae ( Rodentia ). Host site: small intestine. Distribution: Papua New Guinea . Other species: Montistrongylus giluwensis Smales, 2011 ; Montistrongylus karungi Smales, 2012 ; Montistrongylus kaindiensis Smales, 2015 . Original diagnosis: Nippostrongylinae . Synlophe with up to 15 small pointed ridges, left ventral ridges largest: axis of orientation of ridges from ventral right to dorsal left, 55 ° from sagittal axis at mid body, lacking careen. Bursa slightly asymmetrical, right lobe larger, dorsal lobe about same length as lateral lobes. Pattern of bursal rays 3-2. Rays 8 asymmetrical, left ray longer. Dorsal ray divided distal to level of branching of rays 8 from dorsal trunk. Parasites of hydromyine murids [ 45 ]. 3.3.1 Analysis of data and difficulties encountered In the four species described, a careen is absent and the ridges are grouped into two or three sets alternating with two or three ridge-free spaces. Herein, for the description of the synlophe of each species, the ridge sets will be numbered (set 1, set 2, set 3) clockwise starting from the left (set 1). Axis of orientation described as oblique all along body by Smales & Heinrich [ 45 ].