Montistrongylus ingati, Smales & Heinrich, 2010

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

3.3.2.1 Montistrongylus ingati

3.3.2.1.1 Synlophe. The two male sections ( Figs. 3A, 3C ) differ from each other and seem not to belong to the same taxon. In addition, they have two major differences with the female sections ( Figs. 3B, 3D ): there are two sets of ridges in male versus three in female and, on the other hand, in the female sections, the axis of orientation is subfrontal ( Fig. 3D’ ) and not oblique, as illustrated in the original figures. In the female proximal body, to be congruent with the female section at midbody, the section should be rotated ca. 75° counterclockwise ( Fig. 3B’ ).

3.3.2.1.2 Bursa. From the original written description, the left ray 8 is longer than right ray 8 and the right lobe is slightly larger than left one. This means that Figures 63 and 65 are in dorsal view. The pattern is 2-2- 1 in the right lobe and 2-3 in the left lobe. The illustration of two types of dorsal lobes (Figs. 63 and 65) reinforces the idea that two types of males are present among the type material, i.e., probably two different taxa. We have no information to attribute the described bursae to a given type of synlophe.

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.