Helgenema keablei, Smales, 2020

Durette-Desset, Marie-Claude & Digiani, María Celina, 2023, Revision of the genera of Heligmonellidae (Nematoda, Heligmosomoidea), parasitic in Muridae from New Guinea, Parasite (Paris, France) 30 (63), pp. 1-34 : 25-26

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.

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.

Figures

Figure 3a. Montistrongylus Smales & Heinrich, 2010. Body sections. A–D’ Montistrongylus ingati Smales & Heinrich, 2010. A–B’ within proximal body. A male, B, B’ female. C–D’ at midbody. C male, D, D’ female. E–H’ Montistrongylus giluwensis Smales, 2011. E, F within proximal body. E male, F female. G–H’ at midbody. G, G’ male, H, H’ female. Sources: A, D redrawn from [45]; E–H redrawn from [33]. B’, D’, G’, H’ modified figures: B’ rotated ca. 75° counterclockwise with respect of the original. D’–H’ reinterpreted orientation of the axis (subfrontal). G’ reversed on its frontal axis then rotated 30° clockwise with respect to the original. H’ rotated ca. 10–20° counterclockwise with respect to the original.

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.