Allonychiurus pseudokimi, Chang, Liang & Sun, Xin, 2016

Chang, Liang & Sun, Xin, 2016, Two new species of Allonychiurus Yoshii, 1995 (Collembola, Onychiuridae) from eastern China, with a key to world species of the genus, Zootaxa 4061 (4), pp. 429-437 : 433-436

Allonychiurus pseudokimi sp. nov.

Figs 18–29

Material examined. Holotype female, China, China: Jiangsu Province: Nanjing: Gulin Park (32°04’03’’ N, 108°45’11’’ E), April 2015, litter and soil, Yu Daoyuan leg. Paratypes 5 females and 4 males, same data as holotype.

Description. Body white in alcohol. Length of body 1.40–1.60 mm in females, 1.15–1.35 mm in males; holotype 1.55 mm. Shape of body: cylindrical with anal spines on papillae ( Fig. 18 ). Anal spines 0.7 times as long as inner edge of hind unguis.

Pso formulae 32/122/33343 dorsally and 11/000/01000 ventrally ( Figs 18, 23 ). Subcoxae 1 of legs I–III with 1 pso each. Psx only present ventrally, formulae as 0/000/100000 ( Figs 18, 23 ). Subcoxae 1 of legs I–III 1 psx each. Psp formulae 00/011/ 111100 dorsally and 00/111/01m0 1m 0 0 ventrally ( Figs 18, 23 ).

Head. Antennae as long as head. Length ratio of Ant. I: II: III: IV as about 1: 2: 2: 2.5. Subapical organite on Ant. IV with globular apex; basolateral ms above the second proximal row of chaetae ( Fig. 20 ). Ant. III sensory organ consists of 5 papillae, 5 guard chaetae, 2 small rods, and 2 granulated sensory clubs ( Fig. 21 ); lateral ms just behind sensory organ. Ant. II with 17 chaetae. Ant. I with 10 chaetae. Antennal base well marked. PAO with 16–18 compound vesicles arranged in two rows along axis of organ ( Fig. 24 ). Dorsal cephalic chaeta d0 present ( Fig. 24 ). On head 4+4 p-chaetae present between two posterior pso, p1 anterior to others ( Fig. 18 ). 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 hair. Labral chaetae 4/342. Labium with 6 proximal, 4 basomedian (E, F, G, and f) and 6 basolateral (a, b, c, d, e, e’) chaetae ( Fig. 25 ); labial type AC, papillae A–E with 1, 4, 0, 3 and 3 guard chaetae respectively ( Fig. 19 ). Postlabial chaetae 4+4 along ventral groove ( Fig. 25 ).

Body chaetotaxy. S-chaeta not distinguishable from ordinary chaeta. Tiny and blunt ms present on both Th. II and III ( Fig. 26 ). Th. I tergum with 7+7 chaetae. Th. II–III terga with 3+3 chaetae along axial line respectively. Abd. I–II terga with 2+2 chaetae and Abd. III tergum with 3+3 chaetae along axial line respectively ( Fig. 18 ). Abd. IV tergum with axial chaetae m0 and p0, Abd. V tergum with axial chaeta m0, Abd. VI tergum with axial chaetae a0 and p0 ( Figs 18 , 28 ). Th. I–III sterna with 0+0, 1+1, 1+1 chaetae.

Appendages. Subcoxae 1 of legs I–III with 4, 4 and 4 chaetae, subcoxae 2 with 1, 4 and 4 chaetae respectively. Coxae of legs I, II and III with 3, 11 and 14 chaetae, trochanters with 11, 10 and 9 chaetae and femora with 17 chaetae each. Tibiotarsi of legs I, II and III with 21 (2, 8, 11), 21 (2, 8, 11) and 21 (2, 8, 11) chaetae ( Fig. 22 ). Unguis without teeth. Unguiculus 0.5 times as long as inner edge of unguis, with inner basal lamella ( Fig. 22 ). Ventral tube with 8+8 distal chaetae, without anterior or basal chaetae. Furca reduced to finely granulated area, with 4 small dental chaetae arranged in two rows posteriorly and two manubrial rows of chaetae ( Fig. 27 ).

Female genital plate with 18–23 chaetae, males with 38–46 chaetae. Anal valves with numerous acuminate chaetae; each lateral valve with chaetae a0, 2a1; upper valve with chaetae a0, 2b1, 2b2, c0, 2c1 and 2c2 ( Fig. 29 ).

Ecology. In litter and soil under broadleaved trees, in an urban recreational park.

Derivatio nominis. Named for the similarity with the species A. kimi ( Lee, 1973) .

Distribution. Known only from the type locality.

Discussion. The new species is most similar to A. kimi ( Lee, 1973) from Korea as having almost the same number of dorsal, ventral and subcoxal pso, and the same set of axial chaetae on Abd. IV–VI. They can be easily distinguished easily by the number of ventral pso on head (two pso in the new species and only one in A. kimi ), by the number of chaetae along axial line on Abd. I–II (2+ 2 in the new species and 3+ 3 in A. kimi ) and on ventral tube (8+ 8 in the new species and 6+ 6 in A. kimi ) and by the presence/absence of the basal lamella on unguiculus (present in the new species and absent in A. kimi ).

Figures

FIGURES 18 – 23. Allonychiurus pseudokimi sp. nov. 18, dorsal chaetotaxy; 19, labium; 20, antenna; 21, sensory clubs on Ant. III sensory organ; 22, distal part of leg III; 23, ventral side of Abd. II – VI. Scales: 0.1 mm (18, 20, 22 – 23), 0.01 mm (19, 21).

FIGURES 24 – 29. Allonychiurus pseudokimi sp. nov. 24, anterior part of head; 25, ventral side of head; 26, left side of Th. III tergum; 27, central part of abdominal sternum III; 28, central part of Abd. V tergum; 29, anal valves. Scales: 0.1 mm.