Osientomon japonicum Nakamura 2010, sp. nov.
Creators: name: Nakamura, Osami
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Protura
Eosentomidae
Osientomon
Osientomon japonicum

description: <i>Osientomon japonicum</i> Nakamura sp. nov. Figs. 1–3; Table 1 <b>Type specimens.</b> Holotype female (NSMT –Ap 450), Kushiishi –yama, Ajigasawa –machi, Aomori Prefecture, 40°31'06"N, 140°06'17"E, 520 m elevation, litter of a forest dominated by <i>Fagus crenata</i>, 2-X-1999, H. Tamura <i>et al.</i> leg. Paratypes: 1 male (NSMT –Ap 451), 1 female (NSMT –Ap 452), same data as for the holotype. <b>Other specimens examined.</b> One male, Mt. Komaga–take, Kanegasaki–machi, Iwate Prefecture, 39°11'09"N, 140°56'40"E, 620 m elevation, litter of a forest dominated by <i>Quercus crispula</i>, with a ground cover of <i>Sasa kurilensis</i>, 18-VIII-2001, H. Tamura <i>et al.</i> leg.; 1 male, Mt. Kodake, Fujisato–machi, Akita Prefecture, 40°25'58"N, 140°11'51"E, 1040 m elevation, litter of a forest dominated by <i>Q. crispula</i> var. <i>horikawae</i> and <i>Rhododendron brachycarpum</i>, 28-VIII-1994, O. Nakamura leg.; 1 male, Akanagi–san, Tochigi Prefecture, 36°48'33"N, 139°34'07"E, 1670 m elevation, <i>Sasa</i> field, 21-IX-1996, K. Furuno <i>et al.</i> leg.; 1 female, Yamanohana, Katashina– mura, Gunma Prefecture, 36°54'08"N, 139°11'50"E, 1450 m elevation, litter of a forest dominated by <i>F. crenata</i> and <i>Q. crispula,</i> 22-X-1994, H. Tamura <i>et al.</i> leg.; 1 male, Tochimoto, Otaki, Chichibu–shi, Saitama Prefecture, 35°56'58"N, 138°53'57"E, 900 m elevation, 9- VII- 1991, Y. Kuwabara leg.; 1 female, Setokura, Oyama–machi, Toyama Prefecture, litter of a forest dominated by <i>F. crenata</i>, 1280 m elevation, 11-VI-1995, Y. Hirauchi leg. Dorsal Ventral Formula Composition of setae Formula Composition of setae Thorax I 4 1, 2 6-2 A1, 2, 3, M 6 P1,2,3 II 6 A2,4, M 6-2 A1,2,3, M 16 P1,1a, 2,2a, 3,3a, 4,5 6 P1,2,3 III 6 A2, 4, M 6-4 A1, 2, 3, M1, 2 20 P1,1a, 2,2a, 3,3a, 4,4a, 5,6 8 P1,2,2a, 3 Abdomen I 4 A1, 2 4 A1, 2 12 P1,1a, 2,2a, 3,4 4 P1,2 II-III 10 A1, 2, 3, 4, 5 6 A1, 2, 3 16 P1,1a, 2,2a, 3,4,4a, 5 4 P1,2 IV-VI 10 A1, 2, 3, 4, 5 6 A1, 2, 3 16 P1,1a, 2,2a, 3,4,4a, 5 10 P1,2,2a, 2a’, 3 VII 6 A2, 4, 5 6 A1, 2, 3 16 P1,1a, 2,2a, 3,4,4a, 5 10 P1,2,2a, 2a’, 3 VIII 6 M2, 4, 5 2 A 9 Pc, 1a, 1a’, 2,2a 7 Pc, 1,1a, 2 IX-X 8 1, 2, 3, 4 6 1, 1a, 2 XI 8 1,2,3,4 8 1,2,3,4 Telson 9 12 <b>Description.</b> Body length 670 (598–819) µm. Head length 110 (97–113) µm. Setae <i>aa, pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 1A); seta <i>sp</i> equal to <i>p</i> in length; sensilla <i>pp</i> rudimentary. Labral setae present (Fig. 1B). Seta <i>rs</i> simple, equal to <i>sr</i> in length (Fig. 1B). On maxillary palpus (Fig. 1C) sensillum <i>md</i> slightly longer than <i>ml</i>. On galea (Fig. 1D) digit O slightly longer than M and I. Mandible with three apical and one subapical teeth (Fig. 1E). Clypeal apodemes distinct (Fig. 1B). Pseudoculus circular, 10 (7–9) µm, with two depressions (Fig. 1F), PR = 11 (13–15). Foretarsus length (Figs. 1G, H) 73 (63–78) µm; claw 14 (13–14) µm, TR = 5.2 (5.6–5.8); empodium equal to claw in length, 14 (13–14) µm, EU = 1.0; sensillum <i>s</i> slightly longer than claw, 17 (14–15) µm. Sensillum <i>t1</i> closer to α <i>3</i> than to α <i>3'</i>, BS = 0.8; <i>t2</i> thin; <i>t3</i> broadened and long, surpassing tarsus; <i>a</i> slightly broadened; <i>b</i> reaching base of β <i>5</i>; <i>c</i> slightly broadened, reaching base of γ <i>3</i>; <i>d</i> broadened, surpassing base of α <i>6</i>; <i>e</i> absent; <i>f1</i> spatulate; <i>f2</i> thin; <i>g</i> short and setiform; <i>a'</i> thin; <i>b'1</i> absent; <i>b'2</i> thin; <i>c'</i> absent. Length of middle tarsus 32 (28–35) µm, length of claw 11 (10–11) µm, empodium short and about 1/4 of claw length (Fig. 1I), 2 µm long; hind tarsus 41 (36–43) µm, claw 11 (10–11) µm, empodium longer than 2/3 of claw length (Fig. 1J), 8 (7–9) µm; on hind tarsus (Fig. 1J) <i>D2</i> and <i>D4</i> spine-like, <i>D4</i> more slender than <i>D2</i>. Tracheal camerae short (Fig. 2A). Central lobe trapezoidal (Fig. 2B). Laterostigmata II – III distinct (Fig. 2C); II without inner structure; III with a weak curved line. On female squama genitalis (Fig. 2D) S-shaped sclerotization on processus sternalis, caput processus of duck's head type, proximo-lateral sclerotization present, filum processus long, median sclerotization present. Male squama genitalis with short basiperiphallar setae (Fig. 2E). Chaetotaxy as in Table 1. On thoracic tergites II–III, <i>P1a</i> and <i>P2a</i> seta-like, <i>P1a</i> posterior to <i>P1–P2</i>, <i>P2a</i> slightly closer to <i>P2</i> than to <i>P3</i> (Fig. 3A). Setae <i>1</i> and <i>2</i> on abdominal tergite XI microchaetae. <i>P1a</i> on abdominal tergite I, <i>P1a</i> and <i>P2a</i> on I–VI and <i>P2a</i> on VII filiform and longer than <i>P1</i> (Figs. 3B, C, E); <i>P1a</i> on VII sensillumlike and shorter than one-fourth length of <i>P1</i>, at hind margin (Fig. 3E); on tergite VIII (Fig. 3D) <i>P1a’</i> oblong and anterior to <i>P2</i>, <i>P2a</i> linear. Sternite VIII with two anterior and seven posterior setae (Fig. 3F); IX–X with three pairs of setae (Fig. 3F). On telson, a pair of anterior sternal setae small and sensillum-like (Fig. 3F). <b>Diagnosis.</b> This new species is similar to <i>O. linoculum</i> (Zhang &amp; Yin) from China (Yin, 1999; Zhang &amp; Yin, 1981), but differs in pseudoculus structure (two depressions on the disc, rather than five longitudinal striae and three minute globules in <i>O. linoculum</i>), long empodium on hind tarsus (short in <i>O. linoculum</i>), and five pairs of anterior setae on abdominal tergites IV–VI (four pairs in <i>O. linoculum</i>), the presence of anterior setae on sternite VIII (no anterior setae in <i>O. linoculum</i>), and six setae on sternites IX–X (four setae in <i>O. linoculum</i>). One female from Setokura possesses four pairs of anterior setae on the abdominal tergite VII. <b>Etymology.</b> The specific name is named for its country of origin. <b>Distribution.</b> Japan (Honshu).
description: Published as part of <i>Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, pp. 1-109 in Zootaxa 2701</i> on pages 6-10
description: {"references": ["Yin, W. Y. (1999) Protura, Fauna Sinica, Arthropoda. Science Press, Beijing, China, 510 pp., 8 pls. (In Chinese with English summary)", "Zhang, Z. Y. &amp; Yin, W. Y. (1981) Studies on Chinese Protura: description of six new species of Eosentomidae from Guangxi. Contributions from Shanghai Institute of Entomology, 2, 171 - 182. (In Chinese with English abstract)"]}