Protaphorura changbaiensis, Sun, Xin, Zhang, Bing & Wu, Donghui, 2013

Sun, Xin, Zhang, Bing & Wu, Donghui, 2013, Two new species and one new country record of Protaphorura Absolon, 1901 (Collembola: Onychiuridae) from northeast China, Zootaxa 3673 (2), pp. 207-220 : 211-215

Protaphorura changbaiensis sp. nov.

Figs 19–24 , 26–29

Type material. Holotype female, 7 paratype females and 10 paratype males on slide, China: Jilin: Baishan: Fusong: near Changbai National Forest Park (alt. ca 750 m, 42°24’ N, 128°06’ E), 10 July 2012, soil, Liu Dong et al. leg.

Other material. 5 females and 9 males on slide, China: Jilin: Baishan: Fusong: Manjiang (alt. 850m, 41°57’ N, 127°34’ E), 0 1 Sept. 2009, soil, Wu Donghui leg.

Description. Body color white in alcohol. Size 1.45–1.80 mm in females, 1.30–1.55 mm in males; holotype 1.66 mm. Body slender and elongated.

Pseudocellar formula dorsally: 32/012/33232, ventrally: 1(0)0/000/00000 ( Figs 19, 24 & 28 ); subcoxa 1 of legs with 1, 0, 0 pso respectively. Parapseudocellar formula ventrally: 00/000/100000 ( Fig. 24 ); subcoxa 1 of legs without psx. Pseudopores formula dorsally: 00/011/ 111100, ventrally: 00/111/0xxx00 ( Figs 19, 24 & 28 ).

Head. Antennae nearly as long as head. Ant. IV with a subapical organite and basolateral ms about 1/5 of segment length from base ( Fig. 22 ). Ant. III sensory organ composed of 5 papillae, 5 guard chaetae, 2 small sensory rods, 2 granulated sensory clubs and a lateral ms ( Fig. 21 ). Ant. I with 11 chaetae. Ant. II with 17 chaetae. Antennal bases with distinct granulation. PAO composed of 28–34 simple vesicles ( Fig. 20 ). 4+4 p-chaetae between posterior a-pso on head ( Fig. 19 ). 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 7 proximal, 4 basomedian (E, F, G and f) and 6 basolateral chaetae (a, b, c, d, e, e’) ( Fig. 28 ); labial type A, papillae A–E respectively with 1, 4, 0, 3, 3 guard chaetae. Postlabial chaetae 5+5 along ventral groove ( Fig. 28 ).

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 microsensilla laterally ( Fig. 19 ). Th. I tergum with 10–11 chaetae (chaetotaxy type i3 -) ( Fig. 19 ). Abd. I–III and V terga without s’ ( Fig. 26 ). Abd. IV tergum without axial chaeta, Abd. V tergum with p0 axial chaeta, Abd. VI tergum with (rarely without) m0 axial chaeta ( Fig. 19 ). Ratio M/sp on Abd. V as 1.8–2.0 ( Fig. 27 ). Straight lines passing through the bases of chaetae a1 and m1 parallel on Abd. VI tergum ( Fig. 19 ). Anal spines set on distinct papillae, 0.5 times as long as inner edge of unguis.

Th. I–III sterna with 1+1, 1+1, 2+2 chaetae, respectively. Ventral tube with 9+9 distal chaetae and 2+2 basal chaetae, without anterior chaetae ( Fig. 24 ). 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. 29 ). Female genital plate with 14–22 chaetae, male genital chaetae plate with 40–44 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. 24 ).

Appendages. Subcoxa 1 of legs I–III with 5, 5–6 and 5 chaetae, subcoxa 2 with 1, 5 and 5 chaetae, respectively. Tibiotarsi of legs I–III with 22 (11, 8, 3), 23 (11, 8, 4) and 23 (11, 8, 4) chaetae, respectively. Unguis with small inner denticle. Unguiculus slender and pointed, 1.2 times as long as inner edge of unguis, without inner basal lamella ( Fig. 23 ).

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

Ecology. Found in mixed coniferous and broadleaved forest.

Remarks. The new species shares the same pso formula of Abd. I–V terga (33232) as the Crimean species P. ajudagi Pomorski, Skarżyński & Kaprus’, 1998 and the Mongolian species P. microcellata Dunger, 1978 .

The new species can be distinguished from P. ajudagi by the absence of a-pso on Th. II tergum (present in P. ajudagi ), the pso formula ventrally (1(0)0/000/00000 in the new species, 11/000/0001(0)0 in P. ajudagi ), the shape of sensory clubs on Ant. III sensory organ (granulated in the new species, smooth in P. ajudagi ), the absence of axial chaetae m0 on Abd. IV and V (present in P. ajudagi ), the presence of chaetae on Th. I–III sterna (absent in P. ajudagi ) and by absence of the male ventral organ (present in P. ajudagi ). The new species differs from P. microcellata by absence of a-pso on Th. II tergum (present in P. microcellata ), the presence of pso on subcoxa 1 of leg I (absent in P. microcellata ), the ratio of unguiculus/unguis (about 1.2 in the new species, about 0.8 in P. microcellata ) and the ratio of M/sp on Abd. V tergum (1.8–2.0 in the new species, about 5.0–6.0 in P. microcellata ).

Figures

FIGURES 19 – 24. Protaphorura changbaiensis sp. nov. 19, dorsal chaetotaxy; 20, PAO; 21, Ant. III sensory organ; 22, antenna; 23, distal part of leg III; 24, Abd. I – VI sterna (female). Scales: 0.1 mm (19, 22 – 24), 0.01 mm (20 – 21).

FIGURES 25 – 29. Protaphorura bicampata (Gisin, 1956) 25, posterior chaetae row of Abd. I tergum. Protaphorura changbaiensis sp. nov. 26, posterior chaetae row of Abd. I tergum; 27, central part of Abd. V tergum; 28, ventral side of head; 29, chaetotaxy of Abd. IV sternum. Scales: 0.1 mm (27 – 29), 0.01 mm (25 – 26).