Leeonychiurus koreanus, Park, 2017
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publication ID |
https://doi.org/ 10.11646/zootaxa.4329.3.7 |
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publication LSID |
lsid:zoobank.org:pub:848Bafaa-67C8-4105-B12E-F5C8B18Ff689 |
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persistent identifier |
https://treatment.plazi.org/id/CF1687E1-FFF6-FB4F-269A-2D99FE08D3D7 |
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treatment provided by |
Plazi |
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scientific name |
Leeonychiurus koreanus |
| status |
sp. nov. |
Leeonychiurus koreanus sp. nov.
( Figures 1–2 View FIGURE 1 View FIGURE 2 , 5A View FIGURE 5 )
Leeonychiurus sp.1: Lee et al., 2014, Fig. 10.
Diagnosis. Dorsal pseudocellar formula 32/022/33243 ( Fig. 1A View FIGURE 1 ), ventral 11/000/0100; subcoxa 1 of legs I–III with one pseudocellus each. Postantennal organ with 13–15 compound vesicles. Abd. I–III terga with 3+3 chaetae along axial line, and without unpaired axial chaetae. Th. I–III sterna with 0+0, 1+1, 1+1 chaetae, respectively. Upper anal valve without chaetae a1.
Type material. Holotype: male on slide, Korea, Jeoksangsan mountain (N127°41´46´´ E35°58´01´´), Jeoksang-myeon, Muju-gun, Jeollabuk-do, 8–IV– 2016 in litter of a coniferous forest dominated by pine trees, collected by K.H. Park and I . A. Lee. Paratypes: 3 females and 3 males on slides, same data as holotype . 3 females and 2 males on slides, 22–III–2013, same locality as holotypes . 4 females on slides, Jogyeongdan (N127°08´01´´ E35°51´02´´), Deokjin-dong, Jeonju-si, Jeollabuk-do, 9–VII–2013, litter of mixed forest, collected by I.A. Lee and H.S. Kim.
Description. Body length (excluding antennae) of adults: males 0.85–0.96 mm, females 1.18–1.35 mm. Color white in alcohol. Cuticle granulation more or less uniform. Dorsal pseudocellar formula 32/022/33243 ( Fig. 1A View FIGURE 1 ), ventral 11/000/0100; subcoxa 1 of legs I–III with one pseudocellus each. Psx not visible. Psp formula: 00/011/ 11110 dorsally and 00/111/01m0 1m 0 0 ventrally ( Fig. 5A View FIGURE 5 ).
Head: Antennal bases well marked ( Fig. 1A View FIGURE 1 ). Antennae slightly shorter than head; ratio antennae/head=0.8– 0.9. Ant. IV subapical organite with globular apex; invaginated apical bulb absent; microsensillum in lateroexternal position approximately one-third length from the base; 7–8 sensilla, clearly distinguished from ordinary chaetae, present ( Fig. 1B View FIGURE 1 ). Ant. III sensory organ composed of five papillae, five guard chaetae, 2 rods and 2 granulated sensory clubs ( Fig. 2A View FIGURE 2 ); lateral ms just behind sensory organ. Ant. II with 16 chaetae. Ant. I with 9 chaetae. Postantennal organ with 13–15 compound vesicles arranged in two rows along axis of organ ( Figs 2C, 2D View FIGURE 2 ). Head with unpaired dorsal chaeta d0. 4+4 p-chaetae between two inner posterior pso on head, p1 anterior to others. Mandible with strong molar plate and four apical teeth, maxilla bearing 3 teeth and 6 lamellae. Maxillary palp simple with 1 basal chaeta and 2 sublobal hairs. Labral formula as 4/342. Labial palp of type AC ( Fig. 2B View FIGURE 2 : after Fjellberg, 1999), labial papillae A,B,C,D and E with 1,4,0,3,3 guard chaetae respectively ( Fig. 2B View FIGURE 2 ). Labium with 6 proximal, 4 basomedian and 6 basolateral chaetae. 4+4 postlabial chaetae present along ventral groove.
Body chaetotaxy: s-chaeta distinct, their formulas as 2/012/222120 dorsally and 11/000/000100 ventrally. Tiny and blunt ms, present on Th. II and III. Th. I tergum with 6–8+6–8 chaetae. Th. II–Abd. III with 3(4),3(4),3,3,3 chaetae respectively on both side of axial line and without unpaired axial chaetae. Abd. IV tergum with axial chaeta p0; Abd. V tergum with axial chaeta m0; Abd. VI tergum with 2 unpaired axial chaetae: a0, p0 ( Fig. 1A View FIGURE 1 ). Th. I, II and III sterna with 0+0, 1+1 and 1+1 chaetae between legs, respectively. Subcoxae 1 of legs I–III with 3, 3, 3 chaetae respectively ( Fig. 1A View FIGURE 1 ), subcoxa 2 with 1, 4, 4 chaetae.
Appendages: Tibiotarsi I, II and III with 22 (11, 8, 3), 21 (11, 8, 2) and 21 (11, 8, 2) chaetae respectively ( Fig. 1C View FIGURE 1 ). Unguis without teeth. Empodial appendage with basal lamella, appendage length shorter than inner edge of unguis ( Fig. 1C View FIGURE 1 ). Ventral tube with 6+6 distal chaetae, without anterior or basal chaetae. Furca reduced to a finely granulated area, with four small dental chaetae in one row posterior to furcal rudiment; three manubrial rows of chaetae present ( Fig.1D View FIGURE 1 ).
Anal valves chaetotaxy: each lateral valve with chaetae a0, 2a1, b0, 2b1 and 2b2; upper valve with chaetae a0, b0, 2b1, 2b2, c0, 2c1, and 2c2 ( Fig. 1E View FIGURE 1 ). Anal spines set on distinct papillae, as long as inner edge of hind unguis.
Ecology. Found in leaf litter of coniferous and mixed forest.
Etymology. The name “ koreanus ” derives from the Korean Peninsula, where the new species was collected. Korean name of the species: Hankook-lee-eori-tok-to-gi.
Discussion. The new species, L. koreanus sp. nov., can be easily distinguished from all other known species of the genus Leeonychiurus by the number of dorsal and ventral pseudocelli (Table 1 and Discussion in Leeonychiurus analis sp. nov.), first of all by the presence of two (rather than three) distinct pseudocelli on each side of Abd. III tergum.
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