Table 1 Morphometric and morphological features reported for the microscopic identification of the third-stage larvae of the gastrointestinal nematodes (GIN) of sheep

Trichostrongylus spp.

693–714^a

25–29a

Short (A)

16

Triangular, 1 terminal cell

Rounded

1–3 tubercles or smooth

Conic

No

622–796^b

21–40^b

710^c

18–31^c

Teladorsagia circumcincta

819–907^a

32–46^a

Short (A)

16

Triangular/pentagonal, 1 terminal cell

Flat/square, cranial inflexion

Smooth

Blunt

No

797–910^b

30–60^b

830^c

30–44^c

Haemonchus contortus

657–733^a

40–80^a

Medium (B)

16

2 terminal cells

Bullet–shaped

Smooth and pointed

Slightly curved base

Yes (small, 10–15%^c)

650–751^b

65–78^b

730^c

65–82^c

Cooperia spp.

752–862^a

74^a

Medium (B)

16

Triangular, 1 terminal cell

Square/rounded, 2 refractile bodies

Smooth

Pointed

Yes (20%^c)

711–924^b

35–82^b

865^c

39–82^c

Oesophagostomum spp.

796–940^a

130–170^a

Long (C)

24–32^a

Triangular/pentagonal

Rounded^b

Smooth

/

Yes (long,

60–70%^c)

771–923^b

125–160^b

16–24^b

Square^c

850^c

122–207^c

18–22^c

Chabertia ovina

747–800^a

105–120^a

Long (C)

24–32^a

Rectangular

Rounded^b

Smooth

/

Yes (long, 25%^c)

710–789^b

110–150^b

24–32^b

Square^c

750^c

101–150^*c

28–32^c