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 3.3.2.2 Montistrongylus giluwensis 3.3.2.2.1 Synlophe. The indication of the lateral cords in both sexes within the proximal part of the body and the position of the ridge sets and ridge free spaces ( Figs. 3E and 3F ) allows us to re-orientate the sections at midbody. The reversion of the male section on the frontal axis then a slight rotation clockwise ( Fig. 3G’ ) results in both sections (male and female) having the same pattern of ridge sets and ridge-free spaces, but also the same number of ridges in the respective ridge sets, with dorsal ridges less numerous than ventral ones. In Figure 3H, a slight rotation counterclockwise results in an axis of orientation subfrontal ( Fig. 3H’ ). 3.3.2.2.2 Bursa. Unlike the original written description, the illustration of both latero-ventral lobes, highlights the right lobe being clearly larger that the left one. One explanation could be that the lobes illustrated do not belong to the same species. This hypothesis is reinforced by the illustration of two types of dorsal lobe. The first type ( Fig. 10 ) is illustrated independently of the latero-ventral lobes; it is characterized by a right ray 8 extending beyond the level of the division of the dorsal ray. It could be linked to the left lobe (Fig. 12) but this remains hypothetical. The second type (Fig. 13) is illustrated with the right lobe. Even if it is not completely illustrated, it is characterized by a right ray 8 just reaching the level of the division of the dorsal ray. This means that, among the males studied, at least two taxa are present. From the original illustration, the pattern is of type 1-4 in both lobes with a short common trunk of rays 3-6; in the right lobe (Fig. 13) rays 4 to 6 diverge at the same level from their common trunk, in the left lobe, rays 6 diverge proximally to rays 4 and 5.