Key to Strumigenys of Korea

The following key to Korean Strumigenys species based on Dong & Kim (2020).

1

 * Mandibles short, as long as clypeus length, triangular to subtriangular shaped, not elongated, without apical teeth. Mandibular masticatory margin relatively wide with small teeth
 * Mandibles long, more than twice as long as clypeus length, linear, with a couple of apical teeth. Mandibular masticatory margin relatively narrow

2

 * Head including clypeus, mandibles, antennal scape densely covered with reniform hairs in full-face view Strumigenys hexamera
 * Head without reniform hairs in full-face view

3

 * Diastema present between basal mandibles in full-face view. A couple of erect spatulate hairs on head, mesosoma, petiole, post petiole and gaster in profile view Strumigenys mutica
 * Diastema absent between basal mandibles in full-face view. Lacking distinct erect spatulate hairs on body in profile view

4

 * Anterior clypeal margin broadly and shallowly expanded, straight or concave
 * Anterior clypeal margin not broadly expanded

5

 * Midpoint of anterior clypeal margin slightly convex or straight in full-face view; anterolateral margins of clypeus angulated Strumigenys membranifera
 * Midpoint of anterior clypeal margin distinctly concave in full-face view; anterolateral margins of clypeus rounded

6

 * Entire clypeus and anterior margin of antennal scape covered with numerous appressed and erect spatulate hairs. Body covered with hairs Strumigenys incerta
 * Clypeus and antennal scape without appressed and erect spatulate hairs. Body almost entirely bare Strumigenys canina

7

 * Clypeus distinctly longer than wide. Dorsum of body covered with numerous long flagellate hairs Strumigenys masukoi
 * Clypeus length as long as wide, or wider than long

8

 * Head entirely covered with appressed small spatulate hairs in full-face view. Frons not protruded in lateral view Strumigenys japonica
 * Head without appressed spatulate hairs except mandibles in full-face view. Frons distinctly protruded in lateral view

9

 * Numerous laterally projecting hairs present along the dorsolateral margin of head in full-face view. Dorsum of pronotum and mesonotum covered with numerous long standing hairs Strumigenys alecto
 * Lack of laterally projecting hairs along the dorsolateral margin of head in full-face view. Dorsum of pronotum and mesonotum covered with appressed hairs, without distinctly long standing hairs in profile view Strumigenys calvus

10

 * Entire body except mandibles and lateral thorax covered with numerous spatulate hairs Strumigenys choii
 * Spatulate hairs not distinctly present on body

11

 * Body big, slender and elongated in dorsal view (ca. 3.0mm). Mandibles relatively long. Mesosoma in dorsal view relatively narrow. Propodeal lamellae concave anteriorly Strumigenys solifontis
 * Body small and stubby (ca. 2.5mm). Mandibles relatively short. Mesosoma in dorsal view relatively wide. Propodeal margin of propodeal lamellae usually straight or slightly convex

12

 * Apicoscrobal hair relatively short, not flagelliform Strumigenys lewisi
 * Apicoscrobal hair long filiform, usually flagelliform Strumigenys kumadori