Myrmarachne endoi Yamasaki & Ahmad, 2013

Yamasaki, Takeshi, Hashimoto, Yoshiaki, Endo, Tomoji, Hyodo, Fujio, Itioka, Takao & Meleng, Paulus, 2018, New species of the ant-mimicking genus Myrmarachne MacLeay, 1839 (Araneae: Salticidae) from Sarawak, Borneo, Zootaxa 4521 (3), pp. 335-356 : 349-354

Myrmarachne endoi Yamasaki & Ahmad, 2013

( Figs 65–72 )

Myrmarachne endoi Yamasaki & Ahmad, 2013: 523 , figs 17A–F (male holotype from Sabah, Borneo, 5.IX.2008, H. Takizawa leg., deposited in UMS, examined; male paratype from Sarawak, Borneo, 8.IX.2009, T. Endo leg., deposited in FRCS, examined); World Spider Catalog 2018.

Additional material examined. 1 female ( MNHAH; LMy20140325_ TY4 ), same locality as in the paratype above, 25.III.2014, T. Yamasaki leg. ; 1 male ( AUMNS; SUMy20120913_ TYEND05 ), Simeulue , Indonesia, 13.IX.2012, Syaukani & Rijal Satria leg. ; 1 male ( TYC; SgMy20140107_ TYEND02 ), Pulau Ubin , Singapore, 7.I.2014, T. Yamasaki leg.

Diagnosis. Female is distinguishable from other species by the small body (less than 5 mm), and dorsally and laterally swollen thoracic part of carapace. For male, diagnostic characters shown in Yamasaki & Ahmad (2013).

Male. See Yamasaki & Ahmad (2013).

Female ( Figs 65–68 ). Carapace widest at PLE, dorsally constricted behind PLE; thoracic part swollen, and strongly convex in lateral view; height of thoracic dorsum almost same level as cephalic dorsum. Chelicera bearing six prolateral and seven retrolateral teeth on fang furrow. Pedicel short. Abdomen elongated oval without constriction.

Epigyne ( Figs 69–72 ). Copulatory atrium oblique oval, diverging posteriorly, merging anteriorly. Sclerotized copulatory duct broad, each duct beginning from center of its respective atrium, near small anterior copulatory opening with complex twists in front of anterior margin of merged atrium. Spermatheca tube-like, slightly swollen. Coupling pocket absent.

Leg macrosetae. Patella I pv 0, rv 1; tibia I pv 3, rv 3; metatarsus I pv 2, rv 2; tibia II pv 2, rv 2; metatarsus II pv 2, rv 2; legs III and IV with no macrosetae.

Coloration and setation ( Figs 65–68 ). Carapace black, covered with fine setae; posterior margin amber; triangular area above coxa II covered with white scale-like setae. Chelicera dark brown. Labium, endite, sternum yellowish brown or pale brown, partially tinged with black. Abdomen gray, covered with fine setae. Live female appearance shown in Figure 65 .

Measurements (1 female). Total length 4.0. Carapace length 1.75, width 0.96. Width of eye row I 0.92; II 0.83; III 1.03. ALE–PLE 0.68; ALE–PME 0.33. Eye size: AME 0.31; ALE 0.15; PME 0.06; PLE 0.16. Abdomen 2.27.

Distribution. Known from Singapore, Borneo, and Simeulue.

Remarks. Myrmarachne endoi can be found along the edges of secondary forests. The conspecifity of the female specimen with the male specimens of M. endoi was confirmed by the result of DNA barcoding ( Fig. 1 ). In morphology, the male and female share the small body, the short pedicel and the dorsally swollen thoracic part of the carapace.

Figures

FIGURE 1. Neighbor-joining tree generated under K2P distance model, based on a dataset consisting of 679 bp sequences. Bootstrap values (1000 replicates) are shown beside nodes.

FIGURES 65–72. Myrmarachne endoi Yamasaki & Ahmad, 2013, female (LMy20140325_TY4). 65 in living condition, dorsal view; 66 dorsal view; 67 ventral view; 68 lateral view; 69 epigyne, ventral view; 70 dorsal view; 71 cleared, ventral view; 72 dorsal view. Scales. 66–68: 1 mm; 69–72: 0.1 mm.