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.