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. Pickard-Cambridge, 1873)

female
speciesimage

male Pedipalp
(Wiehle 1960a)

 speciesimage

male Pedipalp
(Wiehle 1960a)

 speciesimage

male Pedipalp
(Roberts 1987)
speciesimage

male Palpal tibia
(Roberts 1987)

 speciesimage

male Tibial apophysis
(Wiehle 1960a)

 speciesimage

male Tibial apophysis
(Locket & Millidge 1953)
speciesimage

male Prosoma, lateral view
(Wiehle 1960a)

 speciesimage

male Prosoma, lateral view
(Roberts 1987)

 speciesimage

male Prosoma, lateral view
(Locket & Millidge 1953)
- 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
speciesimage

male Pedipalp, retrolateral view
(Thaler 1971)

 speciesimage

male Pedipalp, prolateral view
(Thaler 1971)

 speciesimage

male Tibial apophysis, dorsal view
(Thaler 1971)
speciesimage

male Prosoma, lateral view
(Thaler 1971)

 speciesimage

male Prosoma, dorsal view
(Thaler 1971)
-

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 Tibial apophysis as fig.

Silometopus bonessi Casemir, 1970

female
speciesimage

male Pedipalp, dorsal view
(Pozzi & Hänggi 1998)
6
(4)

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cp

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

Silometopus curtus (Simon, 1882)

female
speciesimage

male Palpal tibia, dorso-retrolateral view
(Denis 1964e)

 speciesimage

male Palpal tibia, dorsal view
(Denis 1964e)

 speciesimage

male Palpal tibia, dorsal view
(Simon 1926)
-

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cp

 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
speciesimage

male Pedipalp
(Thaler 1972b)

 speciesimage

male Pedipalp
(Thaler 1978a)

 speciesimage

male Tibial apophysis
(Thaler 1978a)
speciesimage

male Prosoma, lateral view
(Thaler 1978a)

 speciesimage

male Prosoma, dorsal view
(Thaler 1978a)
7
(2)

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cp

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

Silometopus ambiguus (O. Pickard-Cambridge, 1906)

female
speciesimage

male Pedipalp
(Roberts 1987)

 speciesimage

male Palpal tibia
(Roberts 1987)

 speciesimage

male Tibial apophysis
(Locket & Millidge 1953)
speciesimage

male Prosoma, lateral view
(Heimer & Nentwig 1991)

 speciesimage

male Prosoma, lateral view
(Roberts 1987)
- Prosoma with slightly elevated eye region; tibial apophysis with bent process

  8  
8
(7)

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cp

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

Silometopus incurvatus (O. Pickard-Cambridge, 1873)

female
speciesimage

male Pedipalp
(Heimer & Nentwig 1991)

 speciesimage

male Pedipalp
(Roberts 1987)

 speciesimage

male Pedipalp
(Locket & Millidge 1953)
speciesimage

male Palpal tibia
(Roberts 1987)

 speciesimage

male Tibial apophysis
(Heimer & Nentwig 1991)

 speciesimage

male Tibial apophysis
(Locket & Millidge 1953)
speciesimage

male Prosoma, lateral view
(Heimer & Nentwig 1991)

 speciesimage

male Prosoma, lateral view
(Roberts 1987)
-

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cp

 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
speciesimage

male Pedipalp
(Wiehle 1960a)

 speciesimage

male Pedipalp
(Wiehle 1960a)

 speciesimage

male Pedipalp
(Roberts 1987)
speciesimage

male Palpal tibia
(Roberts 1987)

 speciesimage

male Tibial apophysis
(Wiehle 1960a)

 speciesimage

male Tibial apophysis
(Locket & Millidge 1953)
speciesimage

male Prosoma, lateral view
(Wiehle 1960a)

 speciesimage

male Prosoma, lateral view
(Roberts 1987)

 speciesimage

male Prosoma, lateral view
(Locket & Millidge 1953)
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
speciesimage

female Epigyne
(Wiehle 1960a)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)
speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Locket & Millidge 1953)
speciesimage

female Vulva
(Wiehle 1960a)
-

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 Groove narrow, posterior margin stronger indented

Silometopus rosemariae Wunderlich, 1969

male
speciesimage

female Vulva
(Thaler 1971)
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
speciesimage

female Epigyne
(Pozzi & Hänggi 1998)

 speciesimage

female Vulva
(Pozzi & Hänggi 1998)
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. Pickard-Cambridge, 1873)

male
speciesimage

female Epigyne
(Heimer & Nentwig 1991)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)
speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Vulva
(Heimer & Nentwig 1991)
speciesimage

female Vulva
(Locket et al. 1974)
- Posterior epigynal margin straight

  14  
14
(13)

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 Epigyne and vulva as figs.; opisthosoma leather-like

Silometopus ambiguus (O. Pickard-Cambridge, 1906)

male
speciesimage

female Epigyne
(Heimer & Nentwig 1991)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)
speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Locket & Millidge 1953)
speciesimage

female Vulva
(Heimer & Nentwig 1991)

 speciesimage

female Vulva
(Locket et al. 1974)
-

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

Silometopus curtus (Simon, 1882)

male
15
(12)

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cp

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

Silometopus elegans (O. Pickard-Cambridge, 1873)

male
speciesimage

female Epigyne
(Wiehle 1960a)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)
speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Roberts 1987)

 speciesimage

female Epigyne
(Locket & Millidge 1953)
speciesimage

female Vulva
(Wiehle 1960a)

 speciesimage

female Vulva
(Locket et al. 1974)
-

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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
speciesimage

female Vulva
(Thaler 1978a)

Further taxa

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1. Silometopus bilacunatus (L. Koch, 1881)
speciesimage

male Pedipalp, retrolateral view
(Holm 1977)

 speciesimage

male Pedipalp, dorsal view
(Kielhorn 2025b)

 speciesimage

male Palpal tibia, dorsal view
(Holm 1977)
speciesimage

male Palpal tibia, dorsal view
(L. Koch 1881)

 speciesimage

male Prosoma, lateral view
(Holm 1977)

 speciesimage

male Prosoma, dorsal view
(Holm 1977)
speciesimage

female Epigyne, ventral view
(Holm 1977)

 speciesimage

female Epigyne, posterior view
(Holm 1977)

 speciesimage

female Vulva, ventral view
(Holm 1977)

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2. Silometopus crassipedis Tanasevitch & Piterkina, 2007
speciesimage

male Pedipalp, retrolateral view
(Tanasevitch & Piterkina 2007)

 speciesimage

male Embolic division, prolateral view
(Tanasevitch & Piterkina 2007)

 speciesimage

male Palpal tibia, dorsal view
(Tanasevitch & Piterkina 2007)
speciesimage

female Epigyne
(Tanasevitch & Piterkina 2007)

 speciesimage

female Vulva
(Tanasevitch & Piterkina 2007)

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3. Silometopus elton Tanasevitch & Grushko, 2020
speciesimage

male Pedipalp, prolateral view
(Tanasevitch & Grushko 2020)

 speciesimage

male Pedipalp, retrolateral view
(Tanasevitch & Grushko 2020)

 speciesimage

male Embolic division
(Tanasevitch & Grushko 2020)
speciesimage

male Palpal tibia, dorsal view
(Tanasevitch & Grushko 2020)

 speciesimage

male Palpal tibia, dorsal view
(Tanasevitch & Grushko 2020)

 speciesimage

male Palpal tibia, retrolateral view
(Tanasevitch & Grushko 2020)
speciesimage

male Prosoma, lateral view
(Tanasevitch & Grushko 2020)

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4. Silometopus furcatus Wunderlich, 2024
speciesimage

male Embolic division, apical view
(Wunderlich 2024)

 speciesimage

male Embolic division, ventral view
(Wunderlich 2024)

 speciesimage

male Palpal tibia, dorsal view
(Wunderlich 2024)
speciesimage

male Prosoma, dorsal view
(Wunderlich 2024)

 speciesimage

male Prosoma, lateral view
(Wunderlich 2024)

 speciesimage

male Labium
(Wunderlich 2024)
speciesimage

female Epigyne
(Wunderlich 2025)

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5. Silometopus graecus Bosmans, 2020
speciesimage

male Pedipalp, retrolateral view
(Bosmans et al. 2009)

 speciesimage

male Pedipalp, dorsal view
(Déjean et al. 2020)

 speciesimage

male Pedipalp, prolateral view
(Déjean et al. 2020)
speciesimage

male Pedipalp, retrolateral view
(Déjean et al. 2020)

 speciesimage

male Pedipalp, ventral view
(Déjean et al. 2020)

 speciesimage

male Embolic division, prolateral view
(Bosmans et al. 2009)
speciesimage

male Palpal tibia, dorsal view
(Bosmans et al. 2009)

 speciesimage

male Prosoma, dorsal view
(Bosmans et al. 2009)

 speciesimage

male Prosoma, lateral view
(Bosmans et al. 2009)
speciesimage

female Epigyne, ventral view
(Bosmans et al. 2009)

 speciesimage

female Epigyne
(Déjean et al. 2020)

 speciesimage

female Vulva, ventral view
(Bosmans et al. 2009)
speciesimage

female Vulva
(Déjean et al. 2020)

 speciesimage

female Vulva
(Déjean et al. 2020)

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6. Silometopus nitidithorax (Simon, 1915)
speciesimage

male Pedipalp, dorsal view
(Déjean et al. 2020)

 speciesimage

male Pedipalp, dorsal view
(Déjean et al. 2020)

 speciesimage

male Pedipalp, prolateral view
(Déjean et al. 2020)
speciesimage

male Pedipalp, retrolateral view
(Déjean et al. 2020)

 speciesimage

male Pedipalp, ventral view
(Déjean et al. 2020)

 speciesimage

male Palpal tibia
(Simon 1926)
speciesimage

male Prosoma, lateral view
(Déjean et al. 2020)

 speciesimage

female Epigyne
(Déjean et al. 2020)

 speciesimage

female Epigyne
(Déjean et al. 2020)
speciesimage

female Epigyne
(Déjean et al. 2020)

 speciesimage

female Vulva, dorsal view
(Déjean et al. 2020)

 speciesimage

female Vulva, dorsal view
(Déjean et al. 2020)

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7. Silometopus tenuispinus Denis, 1950
speciesimage

female Epigyne, ventral view
(Denis 1950a)

 speciesimage

female Prosoma, lateral view
(Denis 1950a)

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8. Silometopus uralensis Tanasevitch, 1985
speciesimage

male Pedipalp, retrolateral view
(Tanasevitch 1985)

 speciesimage

male Embolic division
(Tanasevitch 1985)

 speciesimage

male Palpal tibia
(Tanasevitch 1985)
speciesimage

female Epigyne, dorsal view
(Tanasevitch 1985)

 speciesimage

female Vulva
(Tanasevitch 1985)