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Table 3 Distribution of placental characteristics in hystricognath rodents

From: Growth and development of the placenta in the capybara (Hydrochaeris hydrochaeris)

Taxon

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Principle source

Capybara (Hydrochaeris)

2

2

1

1

1

1

1

2

1

2

1

1

1

1

[19–21], own data

Guinea pig (Cavia)

2

1

1

1

1

1

1

2

1

1

1

1

1

1

[6, 9–12, 21, 27, 32, 33, 38–41]

Prea (Galea)

2

1

1

1

1

1

1

2

1

2

1

1

1

1

[30, 31]

Rock cavy (Kerodon)

2

1

1

1

1

1

1

2

1

1

1

1

1

1

[28], own data

Paca (Cuniculus)

2

2

1

1

1

1

1

2

1

1

1

1

1

1

[20, 21, 42], own data

Agouti (Dasyprocta)

2

2

1

1

1

1

1

2

1

1

1

1

1

1

[20, 21, 30, 34, 42], own data

Chinchilla (Chinchilla)

2

1

1

1

1

1

1

?

1

1

1

1

1

1

[26, 43, 44]

Degu (Octodon)

1

1

1

1

1

1

1

1

1

2

1

1

1

1

[6, 9, 12, 13, 35–37, 45, 46]

Nutria (Myocastor)

2

2

1

1

?

1

1

?

1

1

1

1

1

1

[25, 47]

Canadian porcupine (Erethizon)

2

1

1

1

1

1

?

?

1

1

1

1

1

1

[24]

Dassie rat (Petromus)

1

1

1

1

1

1

1

1

1

1

1

1

1

1

[6, 9, 29, 35, 45]

Cane rat (Thryonomys)

2

1

1

1

1

1

1

?

1

1

?

1

1

1

[6, 48–50]

African porcupine (Hystrix)

2

1

1

1

1

1

1

?

1

1

1

1

1

1

[22]

Mole rat (Bathyergus)

2

1

1

1

1

1

1

?

1

1

1

1

1

1

[22]

  1. The principle sources and the various character conditions are given. See Table 2 for a description of characters and character conditions. Unknown conditions are referred to by a question mark. The capybara, guinea pig, prea and rock cavy are members of the same family (Caviidae). Each of the other species represents a different family.