Key to species of Myrmarachne of Borneo
Male
1 Pedicel almost as long as, or longer than ALE–PLE (Figs 6 A, 13A, 32A)........................................ 2
- Pedicel distinctly shorter than ALE–PLE (Figs 2 A, 4A)...................................................... 4
2 Fang bearing tooth-like apophysis (Fig. 32 D)...................................... melanocephala MacLeay, 1839
- Fang without tooth-like apophysis....................................................................... 3
3 Chelicera apically swollen............................................................. assimilis Banks, 1930
- Chelicera without swollen apex........................................................ cornuta Badcock, 1918
4 Basal half of fang strongly arched (Figs 8 C, 16C, 18B)....................................................... 5
- Fang otherwise...................................................................................... 7
5 With carapace in dorsal view, chelicera very short, less than half the length of carapace........ gedongensis Badcock, 1918
- With carapace in dorsal view, chelicera longer, more than half the length of carapace............................... 6
6 In lateral view upper margin of chelicera convex (Fig. 8 B)............................... biseratensis Badcock, 1918
- In lateral view upper margin of chelicera not convex (Fig. 16 B)................................... cyrtodens sp. nov.
7 Chelicera apically swollen............................................................................. 8
- Chelicera apically not swollen.......................................................................... 12
8 Apical prolateral tooth of chelicera bifid (Figs 4 C, 22D)...................................................... 9
- Apical prolateral tooth of chelicera simple............................................................... 10
9 Chelicera without retrolateral teeth...................................................... alticephalon sp. nov.
- Chelicera with retrolateral teeth.......................................................... lambirensis sp. nov.
10 Body length distinctly less than 5 mm; flange of RTA complex (Figs 20 E–G)....................... hanoii Żabka, 1985
- Body length usually more than 5 mm; RTA weakly sinuous.................................................. 11
11 Prolateral teeth confined to anterior half of chelicera........................................ opaca (Karsch, 1880)
- Prolateral teeth present along whole length of prolateral margin................................ acromegalis sp. nov.
12 Chelicera bearing one or two spurs on its inner margin (Figs 10 A, 30A)........................................ 13
- Chelicera without spur on its inner margin............................................................... 14
13 One spur at apex of inner margin of chelicera (Figs 10 A, 10E).................. borneensis Peckham & Peckham, 1907
- Two spurs in anterior part of inner margin of chelicera, more distal spur very large (Figs 30 A, 30D).................................................................................................. maxillosa (C. L. Koch, 1846)
14 Chelicera distinctly longer than carapace (Figs 17 A–B, 28A–B, 35A–B)....................................... 15
- Chelicera not longer than carapace..................................................................... 17
15 Abdomen narrow elongate-oval (Fig. 28 A)..................................... markaha Barrion & Litsinger, 1995
- Abdomen oval..................................................................................... 16
16 Retrolateral cheliceral teeth confined to posterior part of chelicera................................... endoi sp. nov.
- Retrolateral cheliceral teeth confined to anterior part of chelicera.......................... nitidissima (Thorell, 1877)
17 Chelicera distinctly shorter than carapace; body small, less than 5 mm .......................................... 18
- Chelicera not distinctly shorter than carapace; body not small, more than 5 mm .................................. 19
18 Abdomen with two transverse black bands dorsally........................... mariaelenae Edwards & Benjamin, 2009
- Abdomen without such bands.......................................................... brevichelicera sp. nov.
19 Abdomen with posterior black, broadly transverse band......................... shelfordii Peckham & Peckham, 1907
- Abdomen without such a band......................................................................... 20
20 Embolus of palp broadened apically, with a short process at apex (Fig. 15 E)...................... crassembolus sp. nov.
- Embolus of palp slender, tapering apicad, with pointed apex (Fig. 24 E)........................................ 21
21 Anterolateral area of cephalic part above coxa I fringed with white hairs; dorsum of thoracic part strongly swollen............................................................................. malayana Edmunds & Prószyński, 2003
- Anterolateral area of cephalic part without fringe of white hairs; dorsum of thoracic part without distinct swelling................................................................................................ sabahna sp. nov.
Female
1 Abdomen with posterior broad, black, transverse band.......................... shelfordii Peckham & Peckham, 1907
- Abdomen without such a band.......................................................................... 2
2 Pedicel almost as long as, or longer than ALE–PLE (Figs 7 A, 14A, 33A)........................................ 3
- Pedicel distinctly shorter than ALE–PLE (Fig. 3 A)......................................................... 5
3 Thoracic part distinctly lower than cephalic part, with weakly convex dorsum (Fig. 7 B).......... assimilis Badcock, 1918
- Thoracic part slightly lower than cephalic part, with distinctly convex dorsum (Figs 14 C, 33B)...................... 4
4 Copulatory atria oval; lateral pockets present in front of epigastric furrow (Figs 33 D–H, 34A–C).................................................................................................. melanocephala MacLeay, 1839
- Copulatory atria elongate-oval; small median pocket present in front of epigastric furrow (Figs 14 D–F).................................................................................................... cornuta Badcock, 1918
5 Anterior part of sclerotised copulatory ducts twisted (Figs 9 D, 12D)............................................ 6
- Anterior part of sclerotised copulatory ducts not twisted (Fig. 25 D)............................................ 13
6 Body very small, distinctly less than 5 mm in total length.................................................... 7
- Body larger, more than 5 mm in total length................................................................ 9
7 Anterior part of sclerotised copulatory ducts twisted more than once; lateral pockets present in front of epigastric furrow (Fig. 21 D)................................................................................ hanoii Żabka, 1985
- Anterior part of sclerotised copulatory ducts twisted once; median pocket present in front of epigastric furrow (Figs 12 D–F) 8
8 Abdomen with two transeverse black bands dorsally.......................... mariaelenae Edwards & Benjamin, 2009
- Abdomen without such bands.......................................................... brevichelicera sp. nov.
9 Posterior margin of coxa II and anterior margin of coxa III densely fringed with black hairs (Fig. 23 C)....................................................................................................... lambirensis sp. nov.
- Posterior margin of coxa II and anterior margin of coxa III not fringed with black hairs............................ 10
10 Median pocket of epigyne with anteromedian indentation (Figs 9 D–F)..................... biseratensis Badcock, 1918
- Median pocket anteriorly rounded (Figs 3 D–F)............................................................ 11
11 In lateral view dorsum of cephalic part strongly convex (Fig. 3 B)............................... acromegalis sp. nov.
- In lateral view dorsum of cephalic part almost flat or weakly convex (Figs 29 B, 38B)............................. 12
12 White lateral marking formed of white hairs present in anterolateral cephalic part above coxae I and III.......................................................................................... markaha Barrion & Litsinger, 1995
- White lateral marking absent in anterolateral part of cephalic part.................................. sabahna sp. nov.
13 Cephalic part remarkably higher (about 2X) than thoracic part (Fig. 5 B); spermathecae remarkably large (Figs 5 D–E)......................................................................................... alticephalon sp. nov.
- Cephalic part slightly higher than thoracic part; spermathecae linear, or roundly swollen but not remarkably large....... 14
14 Spermathecae linear and straight (Figs 19 D–E)........................................ gedongensis Badcock, 1918
- Spermathecae oval or spherical........................................................................ 15
15 Median pocket slender, longer than broad (Figs 31 D–E)................................ maxillosa (C. L. Koch, 1846)
- Median pocket broad, broader than long, or indistinct (Figs 25 D–E)............. malayana Edmunds & Prószyński, 2003