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 3.10.1.1 Helgenema keablei ( Figs. 10A–10 C’) 3.10.1.1.1 Synlophe (based on sections from two males and two females ). Sections analyzed herein are within proximal body: female ( Fig. 3B /10A) and at midbody: male ( Fig. 3A /10B) and female ( Fig. 3E /10C). Lateral cords illustrated in Figure 3E /10B, ridges numbered in Figure 3E /10C. In all sections, careen absent. Axis of orientation of ridges described as subfrontal in [ 43 ]. Within proximal body: in Figure 10A (female), 11 ridges irregularly spaced, clearly separated into two groups (6 dorsal, 5 ventral) by two lateral gaps, one left- ventral, one mid-right (arrowheads); ridges small and subequal except left ridge, large, oriented towards ventral side; most ridges within each group disparately oriented; within section, two structures resembling excretory glands figured dorsally with respect to intestine. At midbody: in Figure 10B (male), 13 ridges, regularly spaced and unequal in size; in front of left lateral cord, large ridge oriented towards ventral side and convergent with ridge ventrally adjacent (curved arrows), supporting small cuticular dilatation; remaining ridges small, disparately oriented. Figure 10C (female): 15 ridges regularly spaced, subequal in size and small, including ridges 1’ and 1; ridges numbered from 1 to 7 dorsally and from 1’ to 8’ ventrally; ridges numbered as 1 and 2 apparently convergent (curved arrows), most of remaining ridges perpendicular to body surface. Figure 10. Genus Helgenema Smales, 2020 . Body sections. A–C’ Helgenema keablei . A, A’ within proximal body, female. B–C’ at midbody. B, B’, male. C, C’ female. D–F’ Helgenema lamia Smales, 2021 . D within proximal body, male. E–F’ at midbody. E, E’ male, F, F’, female. Sources: A–C redrawn from [ 43 ]. D–F redrawn from [ 44 ]. A’–C’, E’, F’ modified sections: A’ reversed on its frontal axis with respect to the original, B’ reversed on frontal axis then rotated ca . 15° clockwise with respect to the original. C’, E’, F’ re-numbering of ridges. 3.10.1.1.2 Bursa (number of worms studied not specified, illustrated in [ 43 ]: Figs. 3I, 3J and 3K ). Figure 3I : left lobe, orientation not specified, with no link to left ray 8. Figure 3J , dorsal lobe, orientation not specified with no link to rays 6, rays 8 arising just proximally to division of dorsal ray and reaching level of extremities of this latter. Figure 3K : right lobe, orientation not specified, with no link with right ray 8. From the written description [ 43 ] rays 8 not described, rays 4-6 about same size, reaching margin of bursa, bursa dissymmetrical with left lobe larger and pattern of type 2-3.