Montistrongylus karungi, Smales, 2012

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 : 14

3.3.2.3 Montistrongylus karungi

3.3.2.3.1 Synlophe. The descriptions of the three sections of M. karungi ( Figs. 3I, 3J, 3K ) are similar with those of the male sections of M. ingati ( Figs. 3A, 3C ): two sets of ridges alternating with two ridge-free spaces. The orientation of the axis remains uncertain, many ridges being oriented perpendicularly to body surface. However, the position of the ridge sets and ridge-free spaces differ between the three sections.

The proximal section of a male ( Fig. 3I ) has been deformed during fixation, and the body itself, limited by the hypodermis is not at its correct place. If we displace the body inside the cuticle ( Fig. 3I’ ), we obtain a section in which the position of the ridges and the ridge sets is very similar with the section of the female at midbody. In addition, the number of ridges in the two sections is similar (11 vs. 13) as opposed to 17 for the section of a male at midbody.

This latter section is closely related to the section of a male of M. ingati at midbody: same position of the sets, 15 ridges in M. ingati , 17 in M. karungi .

3.3.2.3.2 Bursa. From the illustration, the bursa is of type 1-4 in both lobes; rays 3 diverging from a common trunk at the same level as ray 6 in the right lobe and proximally to it in the left lobe. Right ray 6 diverges first from the common trunk 4-6 in right lobe, at about same level in the left lobe. There are clearly two different types of dorsal lobes which means that there are probably two different taxa among the males studied.

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.