Myrmarachne endoi, Yamasaki, Takeshi & Ahmad, Abdul Hamid, 2013

Yamasaki, Takeshi & Ahmad, Abdul Hamid, 2013, Taxonomic study of the genus Myrmarachne of Borneo (Araneae: Salticidae), Zootaxa 3710 (6), pp. 501-556 : 523-524

Myrmarachne endoi sp. nov.

( Figs 17 A–G)

Type material. Holotype male (UMS), UMS, Sabah, BORNEO, 5 IX 2008, H. Takizawa leg. Paratype: BORNEO: 1 male (FRCS), Lambir Hills National Park, Sarawak, 8 IX 2009, T. Endo leg.

Diagnosis. Body very small. In males, chelicera distinctly longer than carapace, retrolateral teeth confined to its posterior part ( Fig. 17 C); fang almost straight without tooth-like apophysis; flange of retrolateral tibial apophysis of palp strongly projecting outward ( Figs 17 E–G).

Measurements (male). Carapace length 1.90–(1.95), width 1.22–(1.32). Abdomen length 1.40–(1.65). Chelicera length 2.17–(2.25). Sternum length 1.05–(1.10). Width of eye row I 1.02–(1.08); II 0.97–(1.00); III 1.17– (1.20). ALE–PLE (0.78); ALE–PME 0.35–(0.36). Eye size: AME (0.30)–0.33, ALE (0.18), PME (0.05)–0.06, PLE 0.18–(0.19).

Male ( Figs 17 A–G). Cephalic part almost flat dorsally; in lateral view posterodorsal corner of cephalic part produced roundly above PLE. Thoracic part strongly convex dorsally. Chelicera longer than carapace, with twelve prolateral and three very small retrolateral teeth; retrolateral teeth confined to posterior part of chelicera. Fang almost straight with curved tip, and without tooth-like apophysis. Sternum slender, and strongly overlapped by coxae I, II and III. Abdomen oval with broad dorsal scutum that is incised on each lateral outline anteriorly.

Palp ( Figs 17 E–G). Cymbium without apical spine. Tegulum oval with strongly curved seminal reservoir in anterior part. Embolus forming two oval coils; embolus coils occupying almost half of venter of cymbium. RTA strongly curved outward. Flange of RTA well-developed, and extending outward.

Leg spination. Femur I md 0–1, pd 1; patella I rv 1; tibia I pv 3, rv 3; metatarsus I pv 2, rv 2; femur II md 1, pd 1; tibia II pv 2, rv 2; metatarsus II pv 2, rv 2; femur III md 0–1, pd 2; femur IV md 1, rd 0–1.

Coloration and pilosity. Carapace dark brown; cephalic part sparsely covered with white hairs; thoracic part almost without hairs; white hairs forming lateral marking between cephalic and thoracic parts. Chelicera and fang brown. Maxilla, labium and sternum brownish cream tinged with black. Coxae I, II and IVcream tinged with grey; coxa III cream tinged with black. Abdomen covered with fine hairs; dorsal scutum dark brown with shiny surface; integument except for scutum dark grey.

Etymology. The specific name is named in honor of Dr. Tomoji Endo, Kobe College Graduate School, who collected the paratype.

Distribution. Borneo.

Remarks. The females are unknown. M. endoi in external appearance resembles M. nitidissima , but the cheliceral dentition is different; in M. endoi , retrolateral cheliceral teeth are confined to posterior part of chelicera, but in M. nitidissima , retrolateral teeth are confined to anterior part.

Biology. The species is arboreal. The holotype was collected from a secondary forest and the paratype from a primary forest.

Figures

FIGURE 17. M. endoi sp. nov., male. A, body, dorsal view; B, chelicera and carapace, lateral view; C, chelicera and fang, ventral view; D, maxillae, labium, sternum and coxae; E, palp, ventral view; F, palp, lateral view; G, palpal tibia, dorsal view. (Scales. A – D: 1 mm; E – G: 0.25 mm)