Myrmarachne cyrtodens, 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 : 521-522

Myrmarachne cyrtodens sp. nov.

( Figs 16 A–G)

Type material. Holotype male (UMS), Poring Hot Spring, Kinabalu Park, Sabah, BORNEO, 12 III 2008, T. Yam asaki leg.

Diagnosis. Orange species. In male, basal half of fang strongly arched ( Fig. 16 C); with palp in lateral view flange of retrolateral tibial apophysis roundly produced ( Fig. 16 F).

Measurements (holotype male). Carapace length 2.65, width 1.55. Abdomen length 2.70, width 1.45. Chelicera length 1.90. Sternum length 1.53, width 0.58. Width of eye row I 0.38; II 1.07; III 1.27. ALE–PLE 1.00; ALE–PME 0.48. Eye size: AME 0.38, ALE 0.20, PME 0.05, PLE 0.23.

Male ( Figs 16 A–G). Cephalic part almost flat dorsally; in lateral view posterodorsal corner of cephalic part produced roundly above PLE. Constriction between cephalic and thoracic parts deep and narrow. Dorsum of thoracic part almost flat anteriorly, and sloping downward posteriorly. Chelicera in dorsal view almost parallelsided, and with seven prolateral and six retrolateral teeth. Basal half of fang strongly arched, without tooth-like apophysis. Sternum slightly broad, and slightly overlapped by coxae I and II. Abdomen oval, with dorsal scutum that is incised on each lateral outline anteriorly.

Palp ( Figs 16 E–G). Tegulum round with long c-shaped seminal reservoir. Embolus forming two oval coils; embolus coils occupying almost half of venter of cymbium. RTA curved inward. With palp in lateral view flange of RTA roundly produced.

Leg spination. Femur I md 2, pd 1; tibia I pv 4, rv 4; metatarsus I pv 2, rv 2; femur II md 1; tibia II pv 0, rv 2; metatarsus II pv 2, rv 2; femur III md 1; femur IV md 1.

Coloration and pilosity. Cephalic part orange covered with fine hairs. Thoracic part orange covered with sparse white hairs. Chelicera orange. Maxilla, labium and sternum pale orange. Coxae I, II and IV cream slightly tinged with amber colour; coxa III amber colour. Abdomen occupied by translucent pale brown scutum dorsally; large grey marking on median part of abdomen; integument except for scutum cream.

Etymology. The specific name is derived from the strongly curved fang of the male (Latin prefix “cyrto-” (curved) and noun “dens” (tooth)).

Distribution. Borneo.

Remarks. The females are unknown.

Biology. The species is probably arboreal. The single male was collected from a tree in a garden.

Figures

FIGURE 16. M. cyrtodens 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)