Linyphiidae: Erigone Audouin, 1826

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1
Males

  2  

- Females

  14  

2
(1)

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Patellar apophysis missing; Prosoma as fig. female unknown

Erigone jaegeri Baehr, 1984

- Patellar apophysis present

  3  

3
(2)

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Patellar apophysis projecting; colour light orange to yellow-brown; sternum and opisthosoma slightly blackish; eye field contrastingly black

Erigone autumnalis Emerton, 1882

female

- Patellar apophysis and colour different

  4  

4
(3)
Patellar apophysis rectangularly projecting

  8  

- Patellar apophysis projecting less than 90° from patella and directed away from cymbium

  5  

5
(4)

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Tibia with strongly projecting apophysis

Erigone svenssoni Holm, 1975

female

- Different

  6  

6
(5)

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Tibial apophysis with a distinctly bilobed part next to pointed part

Erigone dentipalpis (Wider, 1834)

female

- Different

  7  

7
(6)

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Dorsal process of tibial apophysis pointed-triangular

Erigone aletris Crosby & Bishop, 1928

female

-

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Tibial apophysis with a short, stout tooth

Erigone dentigera O. P.-Cambridge, 1874

female

8
(4)

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Patellar apophysis strikingly long, approximately rectangularly projecting, tip distinctly bent backwards

Erigone psychrophila Thorell, 1871

female

- Different

  9  

9
(8)
Tibial apophysis with a median process

  10  

- Tibial apophysis without a median process

  13  

10
(9)
Median process of tibial apophysis rounded

  11  

- Median process of tibial apophysis with one or two pointed teeth

  12  

11
(10)

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Tibial apophysis with a medially rounded, flat process

Erigone atra Blackwall, 1833

female

-

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Tibial apophysis with a stronger protruding, rounded process as fig.; sides of patellar apophysis ± parallel; terminal appendix as fig.

Erigone remota L. Koch, 1869

female

12
(10)

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Median process of tibial apophysis with two crossing denticles

Erigone longipalpis (Sundevall, 1830)

female

-

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Median process of tibial apophysis with two denticles arranged in a row

(Additional remark: Holm (1956) distinguishes the north European subspecies maritima from Canadian and Sibiric populations)

Erigone arctica (White, 1852)

female

13
(9)

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Dorsal process of tibial apophysis rounded

Erigone promiscua (O. P.-Cambridge, 1873)

female

-

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Pedipalp as fig.

Erigone tirolensis L. Koch, 1872

female

14
(1)

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Epigynal plate roundish posteriorly, with median groove

Erigone remota L. Koch, 1869

male

- Different

  15  

15
(14)
Posterior epigynal margin distinctly U-like indented medially or with a shallow groove

  16  

- Posterior epigynal margin only slightly bent medially

  19  

16
(15)

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Posterior epigynal margin deeply U-like indented

Erigone longipalpis (Sundevall, 1830)

male

- Posterior epigynal margin with a shallow groove

  17  

17
(16)

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Lateral protruding area of epigynal plate semicircularly sclerotised

Erigone dentigera O. P.-Cambridge, 1874

male

- Different

  18  

18
(17)

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Epigyne lifted and in posterior view with ± triangular median part, distinctly bordered by sclerotised area anteriorly

Erigone psychrophila Thorell, 1871

male

-

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Epigyne lifted and in posterior view not bordered by sclerotised area anteriorly

Erigone tirolensis L. Koch, 1872

male

19
(15)

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Epigynal plate laterally with two circular depressions

Erigone arctica (White, 1852)

male

- Epigynal plate different, more or less unstructured

  20  

20
(19)
Epigynal plate distinctly bordered laterally

  21  

- Epigynal plate laterally different, semicircular

  22  

21
(20)

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Epigynal plate almost twice as wide as long

Erigone atra Blackwall, 1833

male

-

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Epigynal plate ± as long as wide

Erigone dentipalpis (Wider, 1834)

male

22
(20)
Posterior epigynal margin with two uniformly bent protrusions

  23  

- Different

  24  

23
(22)

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Receptacula seminis distinctly shining through epigyne; epigyne lifted and in posterior view ± quadrangular

Erigone promiscua (O. P.-Cambridge, 1873)

male

-

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Receptacula seminis not visible through epigyne; epigyne lifted and in posterior view ± triangular

Erigone aletris Crosby & Bishop, 1928

male

24
(22)

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Epigyne only in posterior area with transverse folds

Erigone autumnalis Emerton, 1882

male

-

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Epigyne in whole length with transverse folds

Erigone svenssoni Holm, 1975

male

Further taxa

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1. Erigone arctica maritima Kulczyński, 1902

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2. Erigone arctica palaearctica Braendegaard, 1934

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3. Erigone arcticola Chamberlin & Ivie, 1947

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4. Erigone cristatopalpus Simon, 1884

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5. Erigone dentosa O. Pickard-Cambridge, 1894

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6. Erigone dumitrescuae Georgescu, 1969

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7. Erigone hypoarctica Eskov, 1989

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8. Erigone jugorum Simon, 1884

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9. Erigone longipalpis meridionalis Simon, 1884

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10. Erigone longipalpis pirini Deltshev, 1983

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11. Erigone remota dentigera Simon, 1926

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12. Erigone tenuimana Simon, 1884

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13. Erigone welchi Jackson, 1911

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14. Erigone whymperi O. P.-Cambridge, 1877

world15. Erigone fluctuans O. P.-Cambridge, 1875
world16. Erigone nigrimana Thorell, 1875
world17. Erigone spadix Thorell, 1875