Leeonychiurus fusongensis, Sun, Xin & Arbea, Javier, 2014

Sun, Xin & Arbea, Javier, 2014, Leeonychiurus, a new genus from East Asia (Collembola: Onychiuridae: Onychiurini), Zootaxa 3847 (1), pp. 115-124 : 117-120

Leeonychiurus fusongensis sp. nov.

Figs 1–8 ; Table 2

Diagnosis. Formula of pso as 32/133/33343 dorsally and 11/000/01120 ventrally. Sensory clubs on AIIIO granulated. PAO with 13–16 compound vesicles. Th. II–III terga with 4+4 axial chaetae along. Th. I, II and III sterna with 0+0, 1+1, 1(2)+1 chaetae respectively. Chaeta a1 on upper anal valve absent.

Type material. Holotype: female, paratypes: 4 females and 3 males; China, Jilin, Baishan, Fusong (42º20’N, 127º13’E, alt. ca 488 m), 26.v.2007, litter and soil in the broad leaved forest, Berlese extraction, Wu Donghui leg. Deposited at NEIGAE.

Description. Body length: females 1.5–1.7 mm, males 1.45–1.6mm; holotype 1.6 mm. Body color: white in alcohol.

Pso formula: 32/133/33343 dorsally and 11/000/01120 ventrally. Subcoxae 1 of legs I–III with 1 pso each ( Figs 1, 6 ). Psx formula as: 0/000/ 101002 + 1m ventrally and absent dorsally. Subcoxae 1 of legs I–III with 1 psx each ( Figs 1, 6 ). Psp formula: 00/011/11110 dorsally and 00/111/01m0 1m 0 0 ventrally.

Head: Antennae as long as head. Length ratio of antennal segments I: II: III: IV = 1: 1.5: 1.5: 2.0. Ant. I with 10 chaetae. Ant. II with 16 chaetae. AIIIO with 5 papillae, 5 guard chaetae, 2 small sensory rods and 2 granulated sensory clubs; lateral ms just behind sensory organ ( Fig. 3 ). Ant. IV subapical organite with apex globular; invaginated apical bulb absent; basolateral ms at about 1/4 length from base, above the first proximal row of chaetae. Antennal base with smaller granulation. PAO with 13–16 compound vesicles arranged in 2 rows along axis of organ ( Fig. 2 ). Dorsal cephalic chaeta d0 present. 4+4 p-chaetae between two inner posterior pso on head, p1 anterior to others ( 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 formula of chaetae 4/342. Labial papillae of AC type, papillae A–E with 1, 4, 0, 3 and 3 guard chaetae respectively ( Fig. 4 ). Labium with 6 proximal, 4 basomedian (E, F, G, and f) and 6 basolateral (a, b, c, d, e, e’) chaetae ( Fig. 7 ). Postlabial chaetae 4+4 along ventral groove ( Fig. 7 ).

Body chaetotaxy: Dorsal chaetae differentiated in meso- and macrochaetae, ratio Sp:m1:p1 on Abd. V = 1:0.5:1. S-chaeta distinct, their formula as 11/012/222120 dorsally and 11/000/000100 ventrally. Tiny and blunt ms, present on Th. II and III ( Fig. 1 ). Th. I tergum with 8–10+8–10 chaetae. Th. II–III terga each with 4+4 chaetae and Abd. I–III terga each with 3+3 chaetae on both sides of axial line. Abd. IV tergum with axial chaeta p0, sometimes with asymmetrical chaetae along axial line; Abd. V tergum with axial chaeta p0; Abd. VI tergum with two axial chaetae a0 and m0 ( Fig. 1 ). Th. I, II and III sterna with 0+0, 1+1, 1(2)+1 chaetae respectively. Subcoxae 1 of legs I–III with 5, 6 and 6 chaetae each, subcoxae 2 with 1, 4 and 4 chaetae respectively.

Appendages: Tibiotarsi I, II and III with 22 (11, 8, 3), 21 (11, 8, 2) and 21 (11, 8, 2) chaetae respectively. Unguis with lateral teeth. Unguiculus slender and pointed, 0.6 times as long as inner edge of unguis, with inner basal lamella ( Fig. 5 ). Ventral tube with 8–9+8–9 distal chaetae, without anterior and basal chaetae. Furca reduced to a finely granulated area, with 4 dental chaetae in one row posterior to furcal rudiment; three manubrial rows of chaetae present ( Figs 6 , 8 ).

Genital plate with 16–21 chaetae in females and 44–52 chaetae in males. Anal valves with numerous acuminate chaetae; each lateral valve with chaetae a0 and 2a1; upper valve with chaetae a0, b0, 2b1, 2b2, c0, 2c1, 2c2 ( Fig. 6 ). Anal spines set on distinct papillae, as long as inner edge of hind unguis.

Ecology. In the broadleaved forest.

Derivatio nominis. Named for the type locality.

Discussion. The new species is distinguished from all other species of the genus by the number of dorsal and ventral pseudocelli. Main differences between L. fusongensis sp. nov. and all other species of the genus are summarized in Table 2 .

Figures

FIGURES 1 – 6. Leeonychiurus fusongensis sp. nov. 1, dorsal body chaetotaxy; 2, PAO; 3, AIIIO; 4, labium; 5, distal part of leg III; 6, chaetotaxy of Abd. II – VI sterna. Scales: 0.1 mm (1, 5, 6), 0.01 mm (2 – 4).

FIGURES 7 – 10. Leeonychiurus fusongensis sp. nov. 7, ventral side of head; 8, chaetotaxy of central part of Abd. IV sternum; Onychiurus polychaetosus 9, dorsal chaetotaxy of head and Th. I – III; 10, dorsal chaetotaxy of Abd. I – VI. Scales: 0.1 mm.