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Table 3 Morphometric and morphological features of the third-stage larvae of the GIN of sheep observed in the present study using DNA analysis as the gold standard

From: Practical guide for microscopic identification of infectious gastrointestinal nematode larvae in sheep from Sardinia, Italy, backed by molecular analysis

Species/genus Mean full body length (range, µm) Standard deviation (µm) Mean sheathed tail length (range, µm) Standard deviation (µm) Group (sheathed tail) Shape of head Shape of tail base Shape of sheathed tail Presence of sheathed tail filament
Trichostrongylus spp. 709 61 35 5 Short (A) Rounded 1–3 tubercles or smooth Conic No
(620–863) (27–55)
Teladorsagia circumcincta 795 52 39 3 Short (A) Flat/square, cranial inflexion Smooth Blunt No
(740–902) (36–45)
Haemonchus contortus 739 29 81 6 Medium (B) Bullet-shaped Smooth and pointed Slightly curved base ?a
(669–817) (67–91)
Cooperia curticei 814 39 59 5 Medium (B) Square/rounded, 2 refractile bodies Smooth Pointed ?a
(739–886) (50–68)
Chabertia ovina 791 37 137 17 Long (C) Rounded Smooth Yes, long
(722–848) (86–160)
  1. aThe presence of a sheathed tail filament for larvae classified within group B was unclear in our hands