Protaphorura jiamusiensis, Sun, Xin, Wu, Donghui & Gao, Meixiang, 2013

Sun, Xin, Wu, Donghui & Gao, Meixiang, 2013, Description of the octopunctata - group species of Protaphorura from China (Collembola: Onychiuridae), Zootaxa 3710 (4), pp. 363-371 : 364-367

Protaphorura jiamusiensis sp. nov.

Figs 1–13

Type material. Holotype female, 15 paratypes females and 3 paratypes males on slides. China: Heilongjiang: Jiamusi (46°51’ N, 130°29’ E), 0 7 Aug. 2010, litter and soil, Wu Donghui et al. leg.

Description. Body color white in alcohol. Size 1.25–1.40 mm in females, 1.05–1.15 mm in males; holotype 1.40 mm. Body slender and elongated.

Pseudocellar formula dorsally: 43/023/33353, ventrally: 1/000/00000 ( Figs 1 & 7 ); subcoxa 1 of legs with 1,1,1 pso respectively. Parapseudocellar formula ventrally: 1/000/ 111101m ( Fig. 7 ); subcoxa 1 of legs with 1, 1, 1 psx respectively. Pseudopores formula dorsally: 00/011/ 111100, ventrally: 0/111/01m 1m1m 0 0 ( Figs 1 & 7 ).

Head. Antennae nearly as long as head. Ant. IV with a subapical organite and basolateral ms about 1/4 of segment length from base ( Fig. 5 ). Ant. III sensory organ composed of 5 papillae, 5 guard chaetae, 2 small sensory rods, 2 granulated sensory clubs and a lateral ms ( Fig. 4 ). Ant. I with 10–11 chaetae. Ant. II with 15–17 chaetae. Antennal bases with distinct granulation.

PAO composed of 16–22 simple vesicles ( Fig. 2 ). 4+4 p-chaetae between postero-internal pso on head ( Fig. 1 ). Mandible with strong molar plate and 4 apical teeth. Maxilla bearing 3 teeth and 6 lamellae. Maxillary palp simple with 1 basal chaeta and 2 sublobal hairs. Labral chaetae formula 4/342. Labium with 6 proximal, 4 basomedian (E, F, G and f) and 6 basolateral chaetae (a, b, c, d, e, e’) ( Fig. 8 ); labial type A, papillae A–E respectively with 1, 4, 0, 3, 3 guard chaetae ( Fig. 3 ). Postlabial chaetae 5(6)+5 along ventral groove ( Fig. 8 ).

Body chaetotaxy. Dorsal chaetotaxy usually with some asymmetry, well differentiated into macro-, meso- and microchaetae. Chaetae s very weakly marked. Th. II–III terga with ms laterally ( Fig. 1 ). Th. I tergum with 9–12 chaetae ( Figs 1 & 10 ). Abd. I–III and V terga without s’ ( Fig. 1 ). Abd. IV tergum with m0 axial chaeta, Abd. V tergum with m0 and p0 axial chaeta, Abd. VI tergum with m0 axial chaeta ( Figs 1 & 11 ). Ratio M/sp on Abd. V as 1.3–1.4 ( Fig. 11 ). Straight lines passing through the bases of chaetae a1 and m1 subparallel on Abd. VI tergum ( Fig. 11 ). Th. I–III sterna with 1+1, 2+2, 2+2 chaetae, respectively. Ventral tube with 8–11+8–11 distal chaetae and 2+2 basal chaetae, without anterior chaetae. Furca reduced to cuticular pocket with 2+2 dental chaetae––1+1 chaetae located on a cuticular fold, remaining 1+1 chaetae located distinctly below of fold; three manubrial rows of chaetae present posteriorly to dental chaetae ( Fig. 9 ). Female genital plate with 12–19 chaetae, male genital chaetae plate with 26–35 chaetae. Male ventral organ absent. Anal valves with numerous acuminate chaetae; each lateral valve with a0, 2a1 and 2a2; upper valve with chaetae a0, 2a1, 2b1, 2b2, c0, 2c1, 2c2 ( Fig. 12 ).

Appendages. Subcoxa 1 of legs I–III with 4–5, 6–7 and 5–6 chaetae, subcoxa 2 with 1, 5 and 5–6 chaetae, respectively. Tibiotarsi of legs I–III with 22 (11, 8, 3), 20 (11, 8, 1) and 22–23 (11, 8, 3–4) chaetae, respectively. Unguis with or without small inner denticle ( Figs 6 & 13 ). Unguiculus slender and pointed, as long as inner edge of unguis, without inner basal lamella ( Figs 6 & 13 ). Anal spines set on distinct papillae, 0.9 times as long as inner edge of unguis.

Etymology. The name of the new species refers to the city where it was found.

Ecology. Found under the willows along the road.

Remarks. The new species is similar to the littoral species P. macfadyeni (Gisin, 1953) as having the pso formula dorsally 43/023/33353 (one form of the dorsal pso formula in P. macfadyeni ), one pso on each subcoxae 1 and the psx formula ventrally 1/000/ 111101m. But they can be separated by the number of pso on Abd. I–III terga (stable in P. jiamusiensis sp. nov. and variable in P. macfadyeni ), the number of vesicles on PAO (16–22 in P. jiamusiensis sp. nov. and 26–30 in P. macfadyeni ), the number of chaetae on Th. I tergum (9–12 in P. jiamusiensis sp. nov. and 15–16 in P. macfadyeni ), the ratio of M/sp on Abd. V tergum (1.3–1.4 in P. jiamusiensis sp. nov. and 2.1 in P. macfadyeni ) and the chaetae on Th. I–III sterna between legs (1+1, 2+2, 2+ 2 in P. jiamusiensis sp. nov.

and 0+0, 2+2, 3+ 3 in P. macfadyeni ). The new species comparing with the Siberian species P. elenae Kaprus’ & Pomorski, 2008, P. licheniphila Kaprus’ & Pomorski, 2008, P. merita Kaprus’ & Pomorski, 2008 and P. nazarovensis Kaprus’ & Pomorski, 2008 are shown in Table 1 .

Figures

FIGURES 1 – 7. Protaphorura jiamusiensis sp. nov.: 1, dorsal chaetotaxy; 2, PAO and anterior cephalic pso; 3, labium; 4, Ant. III sensory organ; 5, antenna; 6, distal part of leg III; 7, Abd. II – VI sterna. Scales: 0.1 mm (1, 5, 7), 0.01 mm (2 – 4, 6).

FIGURES 8 – 13. Protaphorura jiamusiensis sp. nov.: 8, ventral side of head; 9, chaetotaxy of central part of Abd. IV sternum; 10, chaetotaxy of Th. I tergum; 11, Abd. IV – VI terga; 12, anal valves; 13, distal part of leg III. Scales: 0.1 mm (8, 9, 11), 0.01 mm (10, 12, 13).