Table 2 Comparative data for the three new species described and Henneguya spp. from siluriform fishes from South America.

Henneguya novaerae n. sp.

24.9 ± 0.9 (23.3–26.8)

10.7 ± 0.5 (10.1–11.6)

3.8 ± 0.3 (3.2–4.2)

14.7 ± 1.4 (11.5–16.1)

4.8 ± 0.4 (3.8–5.5)

1.3 ± 0.2 (1.1–1.7)

3.5 ± 0.3 (3.1–4.0)

6

Gills filaments

Rhamdia quelen

Henneguya bagre n. sp.

20.9 ± 0.9 (19.2–21.8)

11.2 ± 0.5 (10.5–12.4)

5.1 ± 0.3 (4.6–6.1)

9.8 ± 0.9 (8.2–11.1)

5.9 ± 0.6 (4.9–6.7)

1.6 ± 0.1 (1.4–1.8)

3.8 ± 0.2 (3.6–4.1)

7

Gills filaments

R. quelen

Henneguya breviscauda n. sp.

17.1 ± 0.9 (15.9–18.7)

10.7 ± 0.4 (9.6–10.8)

5.3 ± 0.5 (4.4–6.1)

7.2 ± 0.8 (5.8–8.2)

5.4 ± 0.2 (5.1–5.6)^a 4.6 ± 0.3 (4.2–5.0)^b

1.5 ± 0.1 (1.2–1.6)^a 1.2 ± 0.1 (1.1–1.3)^b

3.7 ± 0.1 (3.6–3.9)

7

Gills filaments

R. quelen

H. jundiai

26.9 ± 1.9 (22.9–29.2)

9.5 ± 0.4 (8.8–10.0)

4.6 ± 0.4 (4.1–5.5)

17.3 ± 1.8 (14.1–19.8)

4.9 ± 0.3 (4.6–5.5)

1.4 ± 0.2 (1.2–1.7)

–

6–7

Gill arches

R. quelen

H. quelen

40.0 ± 2.8 (37.0–42.8)

15.6 ± 0.8 (14.3–16.4)

4.1 ± 0.3 (3.9–4.4)

24.3 ± 2.2 (21–26.5)

5.5 ± 0.5 (5.2–6.0)

1.6 ± 0.2 (1.4–1.8)

–

–

Kidney

R. quelen

H. rhamdia

50.0 ± 1.8

13.1 ± 1.1

5.2 ± 0.5

36.9 ± 1.6

4.7 ± 0.4

1.1 ± 0.2

2.5 ± 0.5

10–11

Gill

R. quelen

H. guanduensis

27.3 ± 38.1

11.4 ± 16.7

4.9 ± 7.9

15.6 ± 22.5

4.4 (3.3–5.6)^a 4.1 (3.3–5.3)^b

2.0 (1.6–2.3)^a 2.2 (1.5–2.8)^b

–

3–6

Gill

Hoplosternum littorale

H. pseudoplatystoma

33.2 ± 1.9

10.4 ± 0.6

3.4 ± 0.4

22.7 ± 1.7

3.3 ± 0.4

1.0 ± 0.1

–

6–7

Gill filaments

Hybrid Pseudoplatystoma corruscans/P. fasciatum

H. eirasi

37.1 ± 1.8

12.9 ± 0.8

3.4 ± 0.3

24.6 ± 2.2

5.4 ± 0.5

0.7 ± 0.1

3.1 ± 0.1

12–13

Gill filaments

P. corruscans; P. fasciatum

H. multiplasmodialis

30.8 ± 1.3

14.7 ± 0.5

5.2 ± 0.3

15.4 ± 1.3

6.1 ± 0.1

1.4 ± 0.1

4.4 ± 0.1

6–7

Gill

P. corruscans

H. corruscans

27.6 (25–29)

14.3 (13–15)

5.0

13.7 (12–15)

6.8 (6–7)

2.0

3.1 ± 0.4

5–6

Gill

P. corruscans

H. maculosus

-

13.7 ± 0.6

4.1 ± 0.2

17.5 ± 1.0

5.6 ± 0.5

1.6 ± 0.2

3.0 ± 0.2

6–7

Gill filaments

P. corruscans

H. cuniculator

29.4 ± 2.4

12.1 ± 1.0

4.8 ± 0.4

16.7 ± 2.0

6.2 ± 0.3

1.8 ± 0.1

4.2 ± 0.7

10–11

Gill filaments

P. corruscans

H. melini

40.8 ± 0.3 (40.3–41.1)

15.5 ± 0.2 (15.3–15.7)

4.7 ± 0.1 (4.6–4.8)

25.3 ± 0.1 (25.2–25.4)

4.8 ± 0.5 (4.3–5.3)

1.7 ± 0.3 (1.4–2.0)

–

5–6

Gill filaments

Corydoras melini

H. occulta

36–46

16–20

8

20

8

–

–

–

Gill

Loricaria sp.

H. pellucida

33.3 ± 1.5

11.4 ± 0.3

4.1 ± 0.4

24.1 ± 1.5

4.0 ± 0.4

1.6 ± 0.2

–

6–7

Visceral cavity/swin bladder

Piaractus mesopotamicus