Linyphiidae: Silometopus Simon, 1926

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1
Males

  2  

- Females

  9  

2
(1)
Cephalic lobe distinctly developed (height at least 1/2 of length)

  3  

- Cephalic lobe weakly developed or missing

  7  

3
(2)

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Tibial apophysis with a thin, S-shaped process

Silometopus elegans (O. P.-Cambridge, 1873)

female

- Different

  4  

4
(3)
Tibial apophysis short, robust, bent

  5  

- Tibial apophysis short and straight or with broad base, long and bent

  6  

5
(4)

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Tibial apophysis as fig.

Silometopus rosemariae Wunderlich, 1969

female

-

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Tibial apophysis as fig.

Silometopus bonessi Casemir, 1970

female

6
(4)

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Tibial apophysis short and straight; opisthosoma flat, longish oval, densely provided with impressed dots

Silometopus curtus (Simon, 1881)

female

-

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Tibial apophysis long and bent; opisthosoma with four dorsal sigilla, outer margin, lung stigma and spinnerets sclerotised, additionally a dorsal scutum

Silometopus braunianus Thaler, 1978

female

7
(2)

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Prosoma without cephalic lobe; tibial apophysis with a short, straight process

Silometopus ambiguus (O. P.-Cambridge, 1906)

female

- Prosoma with slightly elevated eye region; tibial apophysis with bent process

  8  

8
(7)

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Prosoma uniformly descending towards posterior end; pedipalp with very robust embolus; tibia with large, bent apophysis

Silometopus incurvatus (O. P.-Cambridge, 1873)

female

-

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Prosoma straight in anterior region, step-like descending in median region; pedipalp with thin, long embolus; tibial apophysis with one bent and one short, straight process

Silometopus reussi (Thorell, 1871)

female

9
(1)
Epigyne with median plate and oval groove, posteriorly situated

  10  

- Different

  11  

10
(9)

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Groove broad, posterior margin of groove hardly indented

Silometopus reussi (Thorell, 1871)

male

-

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Groove narrow, posterior margin stronger indented

Silometopus rosemariae Wunderlich, 1969

male

11
(9)
Lateral epigynal plates leaving out a ± triangular median part

  12  

-

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Different, posterior epigynal margin almost semicircular

Silometopus bonessi Casemir, 1970

male

12
(11)
Median triangular epigynal part reaching ± 1/2 of epigyne length

  13  

- Median triangular epigynal part reaching ± 1/3 of epigyne length

  15  

13
(12)

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Posterior epigynal margin rounded

Silometopus incurvatus (O. P.-Cambridge, 1873)

male

- Posterior epigynal margin straight

  14  

14
(13)

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Epigyne and vulva as figs.; opisthosoma leather-like

Silometopus ambiguus (O. P.-Cambridge, 1906)

male

-

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Epigyne as fig.; opisthosoma flat, longish oval, densely provided with impressed dots

Silometopus curtus (Simon, 1881)

male

15
(12)

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Median triangular epigynal part reaching approximately 1/3 of epigyne length; opisthosoma grey-brown

Silometopus elegans (O. P.-Cambridge, 1873)

male

-

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Epigyne/vulva as fig.; opisthosoma with four dorsal sigilla, outer margin, lung stigma and spinnerets sclerotised, additionally a dorsal scutum

Silometopus braunianus Thaler, 1978

male

Further taxa

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1. Silometopus acutus Holm, 1977

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2. Silometopus nitidithorax (Simon, 1915)

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3. Silometopus tenuispinus Denis, 1950

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4. Silometopus uralensis Tanasevitch, 1985