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 : 10-12

3.3.1.1 Montistrongylus ingati ( Figs. 3A–3 D’)

3.3.1.1.1 Synlophe (based on sections from six worms, sex not specified). Sections analyzed herein are those within proximal body: male (Fig. 51/3A) and female (Fig. 52/3B) and at midbody: male (Fig. 54/3C) and female (Fig. 55/3D). Lateral cords illustrated; ridges numbered in sections at midbody.

Within proximal body: in Fig. 3A (male), two ridge sets alternating with two ridge free-spaces (arrowheads); ridge set 1 on left and ventral sides made up of nine ridges: four left ridges similar in size, perpendicular to body, smaller and more spaced than five ventral ridges with decreasing gradient in size from left to right, oriented from right to left except last ridge on the right; ridge set 2 made up of two minute ridges perpendicular to body.

Figure 3B (female): three ridge sets alternating with three ridge free-spaces (arrowheads); ridge set 1 on left-dorsal side, made up of four minute ridges perpendicular to body; ridge set 2 on right-dorsal quadrant made up of seven minute ridges without clear orientation; ridge set 3 on mid-ventral side made up of five minute ridges, oriented from right to left.

At midbody: in Figure 3C (male), two ridge sets alternating with two ridge-free spaces (arrowheads); ridge set 1 on left side, made up of nine small ridges (7’-1’, 1 and 2) similar in size, except ridges ventrally adjacent to left lateral cord (3’ and 4’), slightly larger; ridges regularly spaced; ridges 3’-1’, 1 and 2 plus ridge 7’ perpendicular to body surface; other ventral ridges slightly oriented from right to left. Ridge set 2 on right- dorsal quadrant, made up of six small ridges (3 to 8) similar in size and oriented from right to left (ridges 3 to 6) or perpendicularly to body surface (ridges 7 and 8).

Figure 3D (female), three ridge sets alternating with three ridge-free spaces (arrowheads); ridge set 1 in front of left lateral cord, made up of three small ridges (3’ to 1’) similar in size and perpendicular to body surface; ridge set 2 on mid-dorsal quadrant, made up of five small ridges (1 to 5) similar in size, oriented from right to left except ridge 5, perpendicular to body surface; ridge set 3 on right-ventral quadrant, made up of six ridges (9’ to 4’) of which 4’ and 5’ slightly larger, all oriented from right to left.

3.3.1.1.2 Bursa (based on 7 worms; illustrated in [ 45]: Figs. 63 and 65).

Figure 63: dorsal ray and rays 8, orientation not specified; rays 8 dissymmetrical. Figure 65: bursa flattened out, orientation not specified, symmetrical diverging of rays 8 at base of dorsal ray. From the original written description [ 45]: bursa slightly dissymmetrical with right lobe larger; dissymmetrical divergence of rays 8 from median part of dorsal ray; pattern of type 3- 2 in both lobes.

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.