Belongs within: Euplectini.
Euplectus is a cosmopolitan genus of pselaphine beetles with small nude foveae on the vertex.
Characters (Wagner 1975): Small nude vertexal foveae present; no cephalic sulci adjacent to eyes; anterior prosternal foveae present; males with carina of seventh sternite arcuate to left; aedeagus lacking accessory phallus.
<==Euplectus Leach 1817W75
|--E. (Euplectus)R03
| |--*E. (E.) nanus (Reichenbach 1816)W75 (see below for synonymy)
| |--E. (E.) abeillei Guilleb. 1888R03
| |--E. (E.) acomanus Casey 1908W75
| |--E. (E.) afer Reitter 1881R03
| |--E. (E.) aubeanus Reitter 1881R03
| |--E. (E.) bescidius Reitter 1881R03
| |--E. (E.) bonvouloiri Reitter 1881R03
| |--E. (E.) brunneus Grimmer 1841 [incl. E. kunzei Aubé 1844]R03
| |--E. (E.) californicus Casey 1887W75
| |--E. (E.) confluens LeConte 1850W75
| |--E. (E.) corsicus Guilleb. 1888R03
| |--E. (E.) disjunctus Casey 1897 (n. d.)R03, W75
| |--E. (E.) doderoi Reitter 1884R03
| |--E. (E.) duponti Aubé 1833R03
| |--E. (E.) duryi Casey 1908 [incl. E. barri Park & Wagner 1961]W75
| |--E. (E.) elongatus Brendel 1893W75
| |--E. (E.) fairmairei Guilleb. 1888R03
| |--E. (E.) ‘fauveli’ Guilleb. 1888 non Raffray 1882R03
| |--E. (E.) felschei Reitter 1887R03
| |--E. (E.) filiformis (Casey 1908) [=Leptoplectus filiformis]W75
| |--E. (E.) frivaldskyi Saulcy 1878R03
| |--E. (E.) guillabeaui Xambeu 1889R03
| |--E. (E.) idahoensis Park & Wagner 1961W75
| |--E. (E.) intermedius Wollaston 1857R03
| |--E. (E.) linderi Reitter 1884R03
| |--E. (E.) longicollis Casey 1884W75
| |--E. (E.) monticola Wollaston 1864R03
| |--E. (E.) narentinus Reitter 1881R03
| |--E. (E.) occipitalis Reitter 1881R03
| |--E. (E.) pelopis Reitter 1884R03
| |--E. (E.) piceus Motschulsky 1835 [incl. E. dennyi Waterhouse 1861, E. nigricans Chaudoir 1845, E. sulcatulus]R03
| |--E. (E.) planipennis Brendel 1889R03
| |--E. (E.) punctatus Mulsant 1861R03
| |--E. (E.) puncticeps Reitter 1888R03
| |--E. (E.) rotundicollis Brendel 1890R03, W75
| |--E. (E.) sanguineus [incl. E. sanguineus var. georgicus Saulcy 1878]R03
| |--E. (E.) schmitti Raffray 1903 (n. d.)R03
| |--E. (E.) signifer Reitter 1882R03
| |--E. (E.) spinolae Aubé 1844R03
| |--E. (E.) sulciventris Guilleb. 1888R03
| |--E. (E.) theryi Guileb. 1893R03
| |--E. (E.) tholini Guilleb. 1888R03
| `--E. (E.) verticalis Reitter 1884R03
|--E. (Diplectellus Reitter 1909)W75, NT01
| |--E. (D.) karsteni (Reichenbach 1816)W75 (see below for synonymy)
| `--E. (D.) signatus (Reichenbach 1816)W75 [=Pselaphus signatusW75; incl. E. kirbyi Aubé 1833R03, E. minutusR03]
`--E. (Plectophloeus)R03
|--E. (P.) carpathicus Reitter 1881R03
|--E. (P.) corniculatus Reitter 1902R03
|--E. (P.) erichsoni Aubé 1844R03
|--E. (P.) fischeri Aubé 1833 [=E. tischeri]R03
|--E. (P.) madagascariensis Raffray 1903R03
|--E. (P.) megacephalus Raffray 1897R03
|--E. (P.) nitidus Fairmaire 1857R03
|--E. (P.) nubigena Reitter 1876R03
|--E. (P.) reyi Guilleb. 1888R03
|--E. (P.) rhenanus Reitter 1884R03
|--E. (P.) sikorae Wasmann 1894R03
|--E. (P.) tenuicornis Reitter 1884R03
`--E. (P.) tuberculosus Tournier 1867 [incl. E. tuberculatus Reitter 1881]R03
Euplectus incertae sedis:
E. brasiliensisR03
E. brevitarsisR03
E. clavigerR03
E. easternbrookianus Leach 1825R05
E. eminensR03
E. floridae Casey 1908 (n. d.)W75
E. foveolatusR03
E. frontalisR03
E. guatemalenus Sharp 1887R05
E. imperfectus Casey 1897 (n. d.)W75 [=E. (Pycnoplectus) imperfectusR03]
E. incomptusR03
E. indicusR03
E. iracundusR03
E. lepiphorusR03
E. longulusR03
E. metallicusR03
E. mexicanusW75
E. mirificusR03
E. opacus Sharp 1874R03
E. ovicollisR03
E. parvoculatusW75
E. patocolusW75
E. personatusR03
E. pusillusR03
E. scruposusR03
E. sculpturatusR03
E. semiopacusR03
E. solitarius Sharp 1887R03
E. tubigerusR03
E. unicusR03
E. vacuusR03
Nomina nuda: Euplectus adustus Motschulsky 1856R04
E. brachyurus Motschulsky 1851R04
E. breviusculus Motschulsky 1851R04
E. cordicollis Motschulsky 1855R04
E. elongatus Motschulsky 1851R04
E. infuscatus Motschulsky 1851R04
E. pulcher Motschulsky 1851R04
E. robustus Motschulsky 1855R04
E. tropicalis Motschulsky 1855R04
Euplectus (Diplectellus) karsteni (Reichenbach 1816)W75 [=Pselaphus karsteniW75; incl. E. barbarusW75, E. cephalotes Motsch. 1845 (n. n.)R03, E. filum Reitter 1876R03, E. gracilis Chaudoir 1845R03, E. iowensis Casey 1893W75, E. laticeps Guilleb. 1888W75, R03, E. ligneus Motsch. 1845 (n. n.)R03]
*Euplectus (Euplectus) nanus (Reichenbach 1816)W75 [=Pselaphus nanusW75; incl. E. reichenbachiR03, E. nanus var. revelierei Reitter 1884R03, E. richteri Reitter 1870R03]
*Type species of generic name indicated
References
[NT01] Newton, A. F., M. K. Thayer, J. S. Ashe & D. S. Chandler. 2001. Staphylinidae Latreille, 1802. In: Arnett, R. H., Jr & M. C. Thomas (eds) American Beetles vol. 1. Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia pp. 272–418. CRC Press: Boca Raton.
[R03] Raffray, A. 1903. Genera et catalogue des psélaphides. Annales de la Société Entomologique de France 72: 484–604.
[R04] Raffray, A. 1904. Genera et catalogue des psélaphides [part III]. Annales de la Société Entomologique de France 73: 401–476, pls 1–3.
[R05] Raffray, A. 1905. Genera et catalogue des psélaphides [part IV]. Annales de la Société Entomologique de France 73: 635–658.
[W75] Wagner, J. A. 1975. Review of the genera Euplectus, Pycnoplectus, Leptoplectus, and Acolonia (Coleoptera: Pselaphidae) including Nearctic species north of Mexico. Entomologica Americana 49 (2): 125–207.