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Fig. 7 | BMC Zoology

Fig. 7

From: Caenorhabditis monodelphis sp. n.: defining the stem morphology and genomics of the genus Caenorhabditis

Fig. 7

Stemspecies pattern reconstruction. Legend for the cladogram: Black squares indicate the following apomorphies: 1) Glottoid apparatus transformed, sectors of metastegostom not spherically protruding; − median bulb prominent oval; − GP3 shifted posterior of cloacal level (only two precloacal papillae present); − GP7–9 clustered; − spiculum blade dorsally velum-like. 2) GPs 3–6 clustered, but with small gaps in between; − GP6 thickened, its tip embedded within the bursa velum; − posterior part of bursa velum with “wash-board pattern” (transverse striae); − spiculum shaft with transverse seam; − dauerlarvae unsheathed. 3) Stoma triangular in cross section; − spiculum terminally notched or dentated and with an oval “window” in the blade; − postcloacal sensilla filiform; − shortening of the female tail. 4) Adult cuticle lateral with 3 longitudinal ridges; − sexual dimorphism in cephalic sensilla: they are lost in the female (not projecting to the exterior); − each sector of metastegostom with a triangular flap projecting into the buccal cavity; − precloacal lip anteriorly framed. 5) Gymnostom extended and stegostom shortened, so that only a remnant of the pharyngeal sleeve is present; − gubernaculum distally forked (only presumed for P. tristis)

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