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TABLE 4.2 Percentage of Vertebrate Species Listed as Threatened by IUCN Red List and the Estimated Numbers of Parasitic Helminth Species That This Puts at Risk of Extinction (upper) [Poulin and Morand (2004), Who Assume That the Proportion of Parasite Species at Risk Equals the Proportion of Hosts at Risk], and Proportion of Parasites at Risk When Corrected for Different Levels of Host Specificity Exhibited by Each Parasite Taxa in Each Host Taxa (lower)

Parasite Species

Host Species (% of host species listed as threatened)

Chondrichthys

(2)

Osteichthys

(2)

Amphibia

(2)

Reptilia

(3)

Aves

(11)

Mammalia

(11)

Total

No. of parasite species at risk

Trematoda

1

117

23

113

1,085

409

1,748

Cestoda

27

89

6

33

1,546

510

2,211

Acanthocephala

25

3

6

86

33

153

Nematoda

3

53

53

192

1,007

328

1,636

Trematoda

1

18

4

64

365

203

656

Cestoda

16

14

1

15

655

270

971

Acanthocephala

2

0

1

10

8

20

Nematoda

1

5

10

90

307

54

468

Totals (%)

18 (1.13)

39 (0.28)

16 (0.38)

170 (1.48)

1,338 (3.95)

535 (4.60)

2,115 (2.75)



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