type Yllenus arenarius Simon, 1868; gender masculine

N.B.: considered a senior synonym of Pseudomogrus Simon, 1937 by Prószyński, 1968d: 415; Pseudomogrus was revalidated by Marusik & Blick, 2019: 89.

Transferred to other genera:
Yllenus albifrons (Lucas, 1846) -- see Pseudomogrus
Yllenus albocinctus (Kroneberg, 1875) -- see Pseudomogrus
Yllenus algarvensis Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus arabicus Prószyński, 1993 -- see Pseudomogrus
Yllenus aralicus Logunov & Marusik, 2003 -- see Marusyllus
Yllenus auriceps (Denis, 1966) -- see Pseudomogrus
Yllenus auspex (O. Pickard-Cambridge, 1885) -- see Marusyllus
Yllenus bactrianus Andreeva, 1976 -- see Pseudomogrus
Yllenus bajan Prószyński, 1968 -- see Marusyllus
Yllenus bakanas Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus bator Prószyński, 1968 -- see Marusyllus
Yllenus bucharaensis Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus caspicus Ponomarev, 1978 -- see Pseudomogrus
Yllenus coreanus Prószyński, 1968 -- see Marusyllus
Yllenus dalaensis Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus gavdos Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus gregoryi Logunov, 2010 -- see Marusyllus
Yllenus guseinovi Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus halugim Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus hamifer Simon, 1895 -- see Marusyllus
Yllenus improcerus Wesołowska & van Harten, 1994 -- see Pseudomogrus
Yllenus israelensis Logunov, 1996 -- see Pseudomogrus
Yllenus kalkamanicus Logunov & Marusik, 2000 -- see Marusyllus
Yllenus karnai Logunov & Marusik, 2003 -- see Marusyllus
Yllenus knappi Wesołowska & van Harten, 1994 -- see Pseudomogrus
Yllenus kotchevnik Logunov & Marusik, 2003 -- see Marusyllus
Yllenus kronebergi Roewer, 1951 -- see Marusyllus
Yllenus logunovi Wesołowska & van Harten, 2010 -- see Pseudomogrus
Yllenus maoniuensis (Liu, Wang & Peng, 1991) -- see Marusyllus
Yllenus mirabilis Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus mirandus Wesołowska, 1996 -- see Pseudomogrus
Yllenus mongolicus Prószyński, 1968 -- see Marusyllus
Yllenus murgabicus Logunov & Marusik, 2003 -- see Marusyllus
Yllenus namulinensis Hu, 2001 -- see Marusyllus
Yllenus nigritarsis Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus nurataus Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus pamiricus Logunov & Marusik, 2003 -- see Marusyllus
Yllenus pavlenkoae Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus pennatus (Denis, 1957) -- see Phlegra
Yllenus pseudobajan Logunov & Marusik, 2003 -- see Marusyllus
Yllenus pseudovalidus Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus ranunculus Thorell, 1875 -- see Pseudomogrus
Yllenus robustior Prószyński, 1968 -- see Marusyllus
Yllenus saliens O. Pickard-Cambridge, 1876 -- see Pseudomogrus
Yllenus salsicola (Simon, 1937) -- see Pseudomogrus
Yllenus shakhsenem Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus skalanicus (Dobroruka, 2002) -- see Euophrys
Yllenus somonensis Prószyński, 1982 -- see Pseudomogrus
Yllenus squamifer (Simon, 1881) -- see Pseudomogrus
Yllenus starmuehlneri Roewer, 1955 -- see Plexippoides
Yllenus tamdybulak Logunov & Marusik, 2003 -- see Pseudomogrus
Yllenus tschoni (Caporiacco, 1936) -- see Pseudomogrus
Yllenus tuvinicus Logunov & Marusik, 2000 -- see Marusyllus
Yllenus univittatus (Simon, 1871) -- see Pseudomogrus
Yllenus uzbekistanicus Logunov & Marusik, 2003 -- see Marusyllus
Yllenus validus (Simon, 1889) -- see Pseudomogrus
Yllenus vittatus Thorell, 1875 -- see Pseudomogrus
Yllenus zaraensis Logunov, 2009 -- see Pseudomogrus
Yllenus zhilgaensis Logunov & Marusik, 2003 -- see Pseudomogrus

In synonymy:
Yllenus baltistanus shaksgamica Caporiacco, 1935 = Yllenus baltistanus Caporiacco, 1935 (Prószyński, 1968d: 445).
Yllenus staregai Punda, 1975 = Yllenus kulczynskii Punda, 1975 (Logunov, 1992c: 67).

Nomina dubia:
Yllenus brueggeri Lebert, 1877: 313, f. 48-49 (f, Switzerland) -- Lessert, 1910b: 600.
Yllenus pusio (Simon, 1871: 161, originally in Attus; replacement name for Attus pulex Simon, 1868b: 613, j, Portugal or Spain, preoccupied by Hentz, 1846, see Naphrys pulex) -- Logunov & Marusik, 2003a: 157.

Yllenus arenarius Menge, in Simon, 1868b: 633, pl. 7, f. 11 (Dmf).
Yllenus arenarius Simon, 1876a: 129, pl. 9, f. 5 (mf).
Marpesia arenicola Menge, 1877: 472, pl. 77, f. 265 (Dmf).
Yllenus arenarius Chyzer & Kulczyński, 1891: 27, pl. 1, f. 32 (mf).
Yllenus arenarius Simon, 1901a: 582, f. 701-703.
Illenus arenarius Bösenberg, 1903: 437, pl. 42, f. 642 (mf).
Yllenus arenarius Dahl, 1926: 26, f. 75-77 (mf).
Marpissa arenarius Saito, 1936b: 88, pl. 31 (m, probably misidentified).
Yllenus arenarius Prószyński, 1968d: 488, f. 9, 29, 44, 56, 71, 178-185 (mf).
Yllenus arenarius Heimer & Nentwig, 1991: 522, f. 1397 (mf).
Yllenus arenarius Fuhn & Gherasim, 1995: 64, f. 24A-F (mf).
Yllenus arenarius Żabka, 1997: 107, f. 422-428 (mf).
Yllenus arenarius Bellmann, 1997: 230, f. (m).
Yllenus arenarius Logunov & Marusik, 2003a: 85, f. 1-8, 25, 36-37, 39-41, 46-47, 56, 66. 68, 72, 78, 300-305 (mf).
Yllenus arenarius Wunderlich, 2008f: 718, f. 55-57 (mf).
Yllenus arenarius Prószyński, 2016: 29 (author correction from Menge to Simon; Simon named Menge, but apparantly Simon himself described the species).

Yllenus baltistanus Caporiacco, 1935b: 207, pl. 5, f. 5 (Dmf).
Yllenus baltistanus shaksgamica Caporiacco, 1935b: 209 (Dmf) [urn:lsid:nmbe.ch:spidersp:057973].
Yllenus baltistanus Prószyński, 1968d: 445, f. 4, 12, 21, 47, 61, 101-110 (mf, S of Yllenus baltistanus shaksgamica).
Yllenus baltistanus Punda, 1975a: 42, f. 15-17 (f).
Yllenus auspex Żabka, 1981a: 412, f. 11-12 (f, misidentified).
Yllenus baltistanus Logunov & Marusik, 2003a: 128, f. 438-445 (removed mf from S of Y. auspex, contra Prószyński & Zochowska, 1981: 29).

Yllenus charynensis Logunov & Marusik, 2003a: 89, f. 306-308 (Df).

Yllenus desertus Wesołowska, 1991: 4, f. 10-12 (Df).
Yllenus desertus Logunov & Marusik, 2003a: 90, f. 312-313 (f).

Yllenus dunini Logunov & Marusik, 2003a: 92, f. 64-65, 67, 320-324 (Dmf).

Yllenus staregai Prószyński, 1982: 293, f. 49 (f, misidentified).
Yllenus kulczynskii Logunov, 1992c: 67, f. 8a-g, 9a-d (mf, misidentified).
Yllenus erzinensis Logunov & Marusik, 2003a: 94, f. 326-335 (Dmf).

Yllenus flavociliatus Simon, 1895c: 343 (Dmf).
Yllenus flavociliatus Prószyński, 1968d: 479, f. 168-169 (f).
Yllenus flavociliatus Punda, 1975a: 38, f. 8 (f).
Yllenus flavociliatus Wesołowska, 1991: 4, f. 13 (f).
Yllenus flavociliatus Logunov & Marusik, 2003a: 97, f. 80, 338-344 (f. Dm).
Yllenus flavociliatus Su & Tang, 2005: 85, f. 15-18 (m).
Yllenus flavociliatus Peng, 2020: 513, f. 381a-b (m).

Yllenus gajdosi Logunov & Marusik, 2000: 274, f. 13-15 (Df).
Yllenus gajdosi Logunov & Marusik, 2003a: 100, f. 309-311 (f).

Yllenus horvathii Chyzer, in Chyzer & Kulczyński, 1891: 27, pl. 1, f. 31 (Df).
Yllenus horvathi Kolosváry, 1934e: 18, f. 1-4 (m, Df).
Yllenus horvathi Prószyński, 1968d: 481, f. 10, 30, 43, 55, 69-70, 170-177 (mf).
Yllenus horvathi Fuhn & Gherasim, 1995: 66, f. 25A-F (mf).
Yllenus horvathi Szűts et al., 2003: 47, f. 1-5 (mf).
Yllenus horvathi Logunov & Marusik, 2003a: 101, f. 345-352 (mf).
Yllenus horvathii Prószyński, 2017b: 57, f. 25H (mf).

Yllenus karakumensis Logunov & Marusik, 2003a: 103, f. 353-357 (Dmf).

Yllenus kononenkoi Logunov & Marusik, 2003a: 105, f. 358-365 (Dmf).

Yllenus kulczynskii Punda, 1975a: 39, f. 9-12 (Dm).
Yllenus staregai Punda, 1975a: 41, f. 13-14 (Df) [urn:lsid:nmbe.ch:spidersp:057974].
Yllenus kulczynskii Logunov, 1992c: 67 (S of Yllenus staregai; figs. see Yllenus erzinensis).
Yllenus kulczynskii Logunov & Marusik, 2003a: 107, f. 366-371 (mf).

Yllenus lyachovi Logunov & Marusik, 2000: 277, f. 50-54 (Dmf).
Yllenus lyachovi Logunov & Marusik, 2003a: 107, f. 372-383 (mf).

Yllenus marusiki Logunov, 1993b: 50, f. 3A-C (Df).
Yllenus marusiki Logunov & Marusik, 2003a: 110, f. 314-316 (f).

Yllenus rotundiorificus Logunov & Marusik, 2000: 277, f. 48-49 (Df).
Yllenus rotundiorificus Logunov & Marusik, 2003a: 111, f. 336-337 (f).

Yllenus flavociliatus Wesołowska, 1996: 45, f. 37A-F, 38A-C, 39A-C (f, Dm, misidentified).
Yllenus turkestanicus Logunov & Marusik, 2003a: 111, f. 79, 384-388 (Dmf).

Yllenus uiguricus Logunov & Marusik, 2003a: 114, f. 389-393 (Dmf).
Yllenus uiguricus Logunov & Ozernoy, 2022: 635, f. 1-9, 14-66 (mf).

Yllenus zyuzini Logunov & Marusik, 2003a: 116, f. 45, 53, 55, 69-70, 394-405 (Dmf).
Yllenus zyuzini Ponomarev et al., 2019: 326, f. 31-32 (m).