Linyphiidae: Metopobactrus Simon, 1884
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1
 Males

  2  
- Females (in most cases females can only be reliably identified considering males caught in the same place)

  6  
2
(1)

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 Head region only conically elevated; tibial apophysis with row of bristles; male prosoma as fig.

Metopobactrus prominulus (O. Pickard-Cambridge, 1873)

female
speciesimage

male Pedipalp
(Wiehle 1960a)

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male Pedipalp
(Roberts 1987)

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male Tibial apophysis, retrolateral view
(Thaler 1976a)
speciesimage

male Tibial apophysis
(Locket & Millidge 1953)

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male Prosoma, lateral view
(Thaler 1976a)

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male Prosoma, lateral view
(Locket & Millidge 1953)
- Head region with cephalic lobe or frontal processes

  3  
3
(2)

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 Eye field in males with slantingly projecting frontal process; tibia of male pedipalp with bluntly rounded apophysis

Metopobactrus nodicornis Schenkel, 1927

female
speciesimage

male Pedipalp, retrolateral view
(Thaler 1976a)

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male Palpal tibia, dorsal view
(Thaler 1976a)

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male Prosoma, lateral view
(Thaler 1976a)
- Different

  4  
4
(3)

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 Distal margin of pedipalp tibia with a long not very protruding tooth-lamella; prosoma as fig.

Metopobactrus ascitus (Kulczyński, 1894)

female
speciesimage

male Tibial apophysis
(Miller 1944)

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male Prosoma, lateral view
(Miller 1971)
- Distal margin with protruding tooth-lamella

  5  
5
(4)

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 Tibial apophysis of male pedipalp plump

Metopobactrus prominulus (O. Pickard-Cambridge, 1873)

female

male
-

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 Tibial apophysis of male pedipalp slender, with hook-shaped apophysis; prosoma with variable dorsal humps

Metopobactrus nadigi Thaler, 1976

female
speciesimage

male Pedipalp
(Thaler 1976b)

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male Tibial apophysis, dorsal view
(Thaler 1976b)

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male Tibial apophysis, retrolateral view
(Thaler 1976b)
6
(1)		 Epigyne - vulva: entrance ducts initially running parallel

  7  
- Entrance ducts diverging

  8  
7
(6)

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 Vulva as fig.

Metopobactrus ascitus (Kulczyński, 1894)

male
speciesimage

female Vulva
(Miller 1944)
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 Epigyne and vulva as fig.

Metopobactrus nadigi Thaler, 1976

male
speciesimage

female Epigyne
(Hänggi 1989)

 speciesimage

female Vulva
(Hänggi 1989)
8
(6)

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 Eye field uniformly convex; epigyne and vulva as fig.; females can only be reliably identified considering males caught in the same place

Metopobactrus prominulus (O. Pickard-Cambridge, 1873)

male
speciesimage

female Epigyne
(Wiehle 1960a)

 speciesimage

female Epigyne
(Roberts 1987)

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female Epigyne
(Roberts 1987)
speciesimage

female Epigyne
(Roberts 1987)

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female Epigyne/vulva
(Thaler 1976a)

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female Prosoma, lateral view
(Thaler 1976a)
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 Eye field bulged at an obtuse angle; epigyne very similar to prominulus

Metopobactrus nodicornis Schenkel, 1927

male
speciesimage

female Epigyne/vulva
(Thaler 1976a)

 speciesimage

female Prosoma, lateral view
(Thaler 1976a)

Further taxa

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1. Metopobactrus deserticola Loksa, 1981
speciesimage

male Pedipalp, retrolateral view
(Szita et al. 1998)

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male Pedipalp
(Loksa 1981b)

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male Pedipalp, dorsal view
(Gajdoš et al. 2019)
speciesimage

male Pedipalp, retrolateral view
(Gajdoš et al. 2019)

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male Tip of embolus, dorsal view
(Loksa 1981b)

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male Palpal tibia, dorsal view
(Loksa 1981b)
speciesimage

male Prosoma, lateral view
(Szita et al. 1998)

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male Habitus
(Szita et al. 1998)

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female Epigyne
(Szita et al. 1998)
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female Epigyne/vulva, ventral view
(Loksa 1981b)

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female Epigyne
(Gajdoš et al. 2019)

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female Vulva, ventral view
(Szita et al. 1998)
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female Habitus
(Szita et al. 1998)

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2. Metopobactrus falcifrons Simon, 1884
speciesimage

male Pedipalp, retrolateral view
(Segura et al. 2017)

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male Pedipalp, retrolateral view
(Barrientos et al. 2014a)

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male Pedipalp, ventro-retrolateral view
(Barrientos et al. 2014a)
speciesimage

male Palpal tibia, dorsal view
(Simon 1884a)

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male Prosoma, lateral view
(Simon 1884a)

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male Prosoma, lateral view
(Segura et al. 2017)
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male Prosoma, frontal view
(Barrientos et al. 2014a)

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male Prosoma, lateral view
(Barrientos et al. 2014a)

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female Epigyne/vulva
(Thaler 1976a)

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3. Metopobactrus orbelicus Deltshev, 1985
speciesimage

male Pedipalp, retrolateral view
(Deltshev 1985a)

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male Pedipalp, prolateral view
(Deltshev 1985a)

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male Palpal tibia, dorsal view
(Deltshev 1985a)
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male Cephalic area
(Deltshev 1985a)

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male Cephalic area
(Deltshev 1985a)

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female Epigyne
(Deltshev 1985a)
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female Vulva, dorsal view
(Deltshev 1985a)

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female Vulva, ventral view
(Deltshev 1985a)

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4. Metopobactrus verticalis (Simon, 1882)
speciesimage

male Pedipalp, retrolateral view
(IJland & van Helsdingen 2014)

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male Palpal tibia
(Simon 1926)

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male Palpal tibia, dorsal view
(IJland & van Helsdingen 2014)
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male Prosoma, lateral view
(Simon 1926)

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female Epigyne
(Simon 1926)