Microbathyphantes celebes Tanasevitch, 2012

Tanasevitch, Andrei V. & Stenchly, Kathrin, 2012, On linyphiid spiders from Sulawesi, Indonesia (Arachnida, Araneae), Revue suisse de Zoologie 119 (2), pp. 169-180 : 175-179

Microbathyphantes celebes Tanasevitch sp. n. Figs 18-27

ETYMOLOGY: The specific name, a noun in apposition, is taken from the historical name of the island where the new species was found.

HOLOTYPE: Ƌ; INDONESIA, Sulawesi, Kulawi Valley, Oo (1°33.54’S, 120°1.343’E), 550 m a.s.l., cacao tree, branch trap; VIII.2007.

PARATYPES: 2 ♀; INDONESIA, Sulawesi, Kulawi Valley, Oo (1°33.54’S, 120°1.343’E), 550 m a.s.l., cacao tree, branch trap; VIII.2007. – 1 Ƌ; same locality, cacao plantation, pitfall trap; III.2008. – 2 Ƌ; Kulawi Valley , Oo-Marena (1°32.49’S, 120°1.045’E), 575 m a.s.l., cacao plantation, pitfall trap; VI.2007, IX.2007. – 5 Ƌ; Kulawi Valley , Marena (1°33.132’S,

FIGS 14-17

Epigynes of Maorineta sulawesi sp. n., ♀ paratype from Wangka (14-16) and of Nesioneta sola (Millidge & Russell-Smith, 1992) (17, nottoscale). (14, 17) Ventralview. (15) Lateralview. (16) Dorsal view.

120°1.212’E), 585 ma.s.l., cacaoplantation, pitfalltrap & brancheclector; VI.-IX.2007. – 1 Ƌ; same locality; I.2008 . – 1 Ƌ; same locality, cacao plantation, pitfall trap; VI.2007 . – 1 Ƌ; Kulawi Valley , Toro (1°30.586’S, 120°1.157’E), 700 ma.s.l., cacaoplantation, pitfalltrap; VII.2007 . – 1 Ƌ; samelocality; I.2008. – 2 Ƌ; Toro (1°30.049’S, 120°1.723’E), 925 ma.s.l., cacaoplantation, pitfall trap; VII.2007 . – 2 Ƌ ( ZMMU); Kulawi Valley , Sungku (1°27.845’S, 119°59.564’E), 725 ma.s.l., cacaoplantation, pitfalltrap; VIII-IX.2007. – 1 Ƌ; Sungku (1°31.167’S, 120°0.654’E), 650 ma.s.l., cacaoplantation, pitfalltrap; 2008. – 1 £; samelocality; IX.2007 . – 1 Ƌ; Sungku (1°30.161’S, 120°0.454’E), 675 ma.s.l., cacaoplantation, pitfall trap; IV.2007 . – 1 Ƌ; Sungku (1°29.439’S, 120°0.385’E), 750 ma.s.l., cacaoplantation, pitfall trap; IX.2007 . – 1 Ƌ; Sungku (1°32.109’S, 120°0.799’E), 625 ma.s.l., cacaoplantation, pitfall trap; VII.2007 . – 1 Ƌ; KulawiValley , Bolapapu (1°26.105’S, 119°59.552’E), 650 ma.s.l., cacao plantation, pitfalltrap; VI.2007 . – 1 Ƌ; KulawiValley , Watukilo (1°36.029’S, 120°2.062’E), 475 ma.s.l., cacaotree, brancheclector; VIII.2007 . – 1 Ƌ; KulawiValley , Lawua (1°36.651’S, 120°2.035’E), 425 ma.s.l., cacaoplantation, pitfalltrap; VII.2007 . – 1 Ƌ; KulawiValley , Tompibugis (1°37.524’S, 120°2.039’E), 400 ma.s.l., cacaoplantation, pitfalltrap; IX.2007 . – 1 Ƌ; KulawiValley , Pilimakujawa (1°38.998’S, 120°2.842’E), 400 ma.s.l., cacaoplantation, pitfalltrap; VII.2007 . – 1 Ƌ; KulawiValley , Wangka (1°36.458’S, 120°1.304’E), 500 ma.s.l., cacao plantation, pitfall trap; III.2008 . – 1 Ƌ; Kulawi Valley , Bolapapu (1°26.105’S, 119°59.552’E), 650 ma.s.l., cacaoplantation, pitfalltrap; VIII.2007 .

FIGS 18-23

Microbathyphantes celebes sp. n., Ƌ paratype from Sungku (18, 19, 21-23) and Ƌ paratype from Mareva (20). (18, 19) Right palp, retrolateral and proventral view, respectively. (20) Palpal tibia, retrolateral view. (21) Distal suprategular apophysis. (22) Embolic division. (23) Embolic plate.

DIAGNOSIS: The new species is characterized by the peculiar shape of its embolic plate (sensu Beatty et al., 1991; Saaristo, 1995) (= lamella or lamella characteristica auct.) and by the hook-like outgrowth resembling a pit-hook structure on the suprategular apophysis in males, as well as by the trapeziform shape of the shallow epigynal cavity in females.

DESCRIPTION: Male (paratype from Sungku). Total length 1.63 (1.60-1.68). Carapace unmodified, 0.75 long, 0.60 wide, greyish yellow to pale brown, with a narrow grey margin; in some specimens carapace with a grey polygonal spot in postocular area and with indistinct radial stripes. Eyes normal, not enlarged. Sternum grey. Chelicerae 0.45 long. Stridulatory fields absent. Legs pale yellow, leg I 3.83 long (1.00+0.23+1.00+0.95+0.65), IV 3.64 long (0.98+0.20+1.00+0.88+0.58). Chaetotaxy: FIGS 24-27

Epigynes and vulvae of Microbathyphantes celebes sp. n., ♀ paratype from Sungku (24, 25) and ♀ paratype from Oo (26, 27). (24, 26) Ventral view. (25, 27) Dorsal view. Arrows indicate which details belong to the same specimen.

FeI: 1-1-0-0, II: 1-0-0-0, III-IV: 0-0-0-0; TiI 2-1-1-0, II: 2-0-1-0, III-IV: 2-0-0-0. All metatarsi spineless. TmI 0.20 (0.18-0.22). Metatarsus IV without trichobothrium. Palp (Figs 18-23): Tibia slightly elongated, unmodified. Paracymbium simple, U-shaped, pockets absent. Suprategular apophysis short and wide. Embolic division complex, consisting of two parts: embolic plate and coiled embolus with a narrow radix. Embolic plate with a long anterior projection ending in a hook-like outgrowth. Abdomen 0.78 long, 0.50 wide, grey, dorsal pattern absent.

Female (paratype from Sungku). Total length 1.75 (1.68-1.75). Carapace 0.75 long, 0.55 wide. Chelicerae 0.35 long. Leg I 3.31 long (0.85+0.23+0.85+0.80+0.58), IV 3.19 long (0.88+0.18+0.85+0.78+0.50). TmI 0.23. Abdomen 1.10 long, 0.70 wide. Epigyne (Figs 24-27) small, epigynal cavity shallow, trapeziform, receptacles spherical. Body and leg coloration, and chaetotaxy as in male.

VARIABILITY. The males show variability in the length of the palpal tibia

(Fig. 18 cf. Fig. 20).

TAXONOMIC REMARKS: The new species is most similar to the Oriental-Pacific M. palmarius (Marples, 1955), but differs well by the shape of the anterior projection of the embolic plate in males, as well as by the trapeziform epigynal cavity in females.

DISTRIBUTION: Currently known from Kulawi Valley , Sulawesi only .