Paranura setosa Smolis & Deharveng, 2015, sp. nov.

Paranura setosa sp. nov.

Figs 70–75, Tables 13–14

Etymology. The species name referring to additional cephalic chaetae.

Diagnosis. Body white. 3+3 eyes on head. Tubercles and reticulations not developed. Head with chaetae O, A and E. Head with three ocular chaetae. Thorax I with 2 chaetae De. Thorax II–III with 3 chaetae Di. Thorax II–III with 3 and 4 ordinary chaetae De respectively. Abdomen V with 2+2 chaetae Di. Abdomen V slightly longer than VI. Abdomen without clavate chaetae. Furca rudimentary without microchaetae. Male ventral organ absent. Tibiotarsi with chaetae M.

Description. Habitus typical for Paranura Axelson, 1902 genus. Buccal cone elongate. Body length (without antennae) 0.63–1.05 mm (holotype: 0.63 mm). Colour of body when alive and in alcohol white. Tubercles not developed. Ordinary dorsal chaetae (Figs 70, 72) differentiated into short, thin, acuminate microchaetae, medium size, smooth, acuminate mesochaetae and long, nearly smooth (with small denticles visible under large magnification), relatively thick, arc-like at apex macrochaetae Ml and Mc. No plurichaetosis on body.

Head. Antennae long, only slightly shorter than head (Fig. 72). S-chaetae of ant. IV relatively short and thin, S1 and S2 slightly thinner than others (Fig. 73). Apical bulb distinct and trilobed. Chaetotaxy of antennae as in Fig. 73 and Tab. 13. Buccal cone relatively long and rounded at apex, ventral sclerifications as in Fig. 71. Maxilla needle-like, mandible simple with three teeth. Chaetotaxy of labium as in Fig. 71, labial papillae x absent. Labrum chaetotaxy 4/3,4 (Fig. 74). Group Vi with 6+6 chaetae (Fig. 71). Groups Vea, Vem and Vep with 4, 3 and 4 chaetae respectively. Dorsal chaetotaxy of head as in Tab. 13. and Figs 70,72. Dorsal chaetotaxy of central area with one or two additional chaetae (Fig. 70). Line of chaetae Di2–De2 crosses line Di1–De1 on head (cross-type, Deharveng 1983). 3+3 relatively large black eyes, their diameter about three times as large as the diameter of chaeta Ocm socket (Fig. 72).

Thorax, abdomen, legs. Dorsal chaetotaxy as in Fig. 72 and in Tab. 14. Ventral chaetotaxy as in Tab. 14 and Fig. 75. S-chaetae long, slightly longer than nearby macrochaetae (Fig. 72). S-chaetae formula of body: 022/11111, s-microchaeta on Dl of th. II present. Furcal remnant with 4–5 mesochaetae and without microchaetae (Fig. 75). Male without ventral modified chaetae (“male ventral organ”). Claw without internal tooth. Chaeta M present on tibiotarsus, chaetae B4 and B5 short. Chaetotaxy of legs as in Tab. 14.

Types. Holotype (female) and 2 paratypes (1 female subadult, 1 juvenile) on slides, Russia: Primorye, Khualaza, forest litter and decaying wood, Berlese extraction, 19.IX. 2004, leg. L. Deharveng & A. Bedos, X=132.783957°, Y=43.108999°, altitude about 1000 m (RU-029); 1 paratype female on slide, Primorye, Khualaza: at the 2nd pass, 750 m above sea level, forest, litter, Berlese, 19.IX.2004, leg. L. Deharveng & A. Bedos, X=132.787742° Y=43.117823°, altitude about 750 m (RU-032). Holotype and 2 paratypes (RU-029) deposited in MNHN, paratype (RU-032) housed in MSPU.

a) Cephalic chaetotaxy––dorsal side.

b) Chaetotaxy of antennae.

Terga Legs

Di De Dl L Scx2 Cx Tr Fe TT th. I 1 2 1 – 0 3 6 13 19 th. II 3 3+s 3+s+ms 3 2 7 6 12 19 th. III 3 4+s 3+ s 3 2 8 6 11 18

Sterna

abd. I 2 3+ s 2 3 VT: 4

abd. II 2 3+ s 2 3 Ve: 5; Vel present

abd. III 2 3+ s 2 4 Ve: 5; Fu: 4–6me, 0 mi

abd. IV 2 2+ s 3 8 Vel: 4; Vec: 2; Vei: 2; Vl: 4

abd. V (2+2) 6+s Ag: 3; chaetae L‘ and Vl present abd. VI 7 Ve: 12–13; An: 2 mi

Remarks. Paranura setosa sp. nov. can be easily identified by one or two additional chaetae on central area of head, a character unique within the genus. Several characters, such as the number of eyes and ocular chaetae, and chaetotaxy of abdomen, are suggestive of a relationship with P. k or y o i Deharveng & Weiner, 1984, described from North Korea. Additionally, Paranura setosa sp. nov. differs in having abdomen II with chaetae Ve1 (in koryoi absent), trochanters I–III with 6 chaetae (in koryoi 5 chaetae) and tibiotarsi with chaeta M (in koryoi absent).

Biology. The new species is resident in montane forest where it inhabits litter and decaying wood. Bisexual species.