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

description: <i>Eosentomon dubium</i> Nakamura sp. nov. Figs. 19–20; Table 7 <b>Type specimens.</b> Holotype female (NSMT –Ap 467), Jouin –ji, Tsukiya –cho, Ashikaga –shi, Tochigi Prefecture, 36º22'48"N, 139º26'31"E, 225 m elevation, litter of a plantation of <i>Cr. japonica</i>, 12-VII-1997, K. Furuno <i>et al.</i> leg. Paratypes: 2 males (NSMT –Ap 468–469), same data as for the holotype; 1 female (NSMT –Ap 470), Mansho, Yano, Kamiizumi –mura, Saitama Prefecture, 36º07'12"N, 139º01'14"E, litter of a forest dominated by <i>Q. myrsinaefolia</i>, 450 m elevation, 24-VIII-1993, O. Nakamura leg. <b>Other specimens examined.</b> One male, 1 female, Iwasaki, Toyohashi –shi, Aichi Prefecture, 150 m elevation, 7-XII-1977, K. Niijima leg.; 1 male, Omoto –dake, Ishigaki Island, Okinawa Prefecture, 24º25'28"N, 124º10'49"E, 450 m elevation, litter of a evergreen broad-leaved forest, 24-V-2000, H. Mizushima leg.; 1 male, Komi, Iriomote Island, Okinawa Prefecture, 24º19'28"N, 123º54'09"E, 20 m elevation, litter of a evergreen broad-leaved forest, 2- III- 2002, S. Nagashima leg.; 1 female, Ohara, Iriomote Island, Okinawa Prefecture, 24º16'35"N, 123º52'10"E, 40 m elevation, litter of a forest dominated by <i>Pandnus odoratissimus</i>, 29-V-2000, H. Mizushima leg. <b>Description.</b> Body length 572 (520–702) µm. Head 85 (86–89) µm long. Setae <i>aa</i>, <i>pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 19A); seta <i>sp</i> 1.5 (1.4–1.5) times longer than <i>p</i>; sensilla <i>pp</i> rudimentary. Labral setae present (Fig. 19B). Seta <i>rs</i> inflated, equal to <i>sr</i> in length (Fig. 19B). On maxillary palpus (Fig. 19C) sensillum <i>md</i> slightly longer than <i>ml.</i> On galea (Fig. 19D) digit O longer and more slender than M and I; M and I close to each other. Mandible with 3 teeth (Fig. 19E). Clypeal apodemes distinct (Fig. 19F). Pseudoculus circular (Fig. 19G), 11 (12– 14) µm long, PR = 8 (6–8). Foretarsus length (Figs. 19H, I) 57 (57–58) µm; claw 13 (12–13) µm, TR = 5; empodium slightly shorter than claw, 13 (12–13) µm, EU = 1.0; sensillum <i>s</i> slightly longer than claw, 14 (13) µm. Sensillum <i>t1</i> closer to α <i>3</i> than to α <i>3'</i>, BS = 0.8 (0.8–0.9); <i>t2</i> thinly spatulate; <i>t3</i> long, surpassing base of α <i>7</i>; <i>a</i> closer to γ <i>1</i> than to γ <i>2</i>; <i>b</i> spatulate; <i>c</i> slightly broadened; <i>d</i> broadened, surpassing base of α <i>6</i>; <i>e</i> and <i>g</i> roundedly spatulate and long; <i>f1</i> thinly spatulate; <i>f2</i> long, reaching base of γ <i>5</i>; <i>a'</i> at same level with α <i>3</i>; <i>b'1</i> slightly broadened and nearer to δ <i>3'</i> than to δ <i>4'</i>; <i>b'2</i> thinly spatulate; <i>c'</i> absent. Length of middle tarsus 26 (26–28) µm, length of claw 9 µm; empodium short and less than 1/ 4 of claw length (Fig. 19J), 1 (1–2) µm long; hind tarsus 31 (30–35) µm, claw 10 (9–11) µm; empodium about 2/3 of claw length (Fig. 19K), 7 (5–7) µm; on hind tarsus (Fig. 19K) <i>D2</i> and <i>D4</i> spine-like, somewhat more slender than <i>D5</i>. Tracheal camerae thin (Fig. 19L). Central lobe trapezoidal, inner line constricted in middle (Fig. 19M). Laterostigmata II–III distinct, with no inner structure. On female squama genitalis (Fig. 19N) S-shaped sclerotization on processus sternalis, caput processus duck’s head-like, filum processus long. Male genitalis with short basiperiphallar setae. Chaetotaxy as in Table 7. On thoracic tergites II–III, <i>P1a</i> seta-like, posterior to <i>P1–P2</i>; <i>P2a</i> seta-like, nearer to <i>P2</i> than to <i>P3. P1a</i> on abdominal tergite I, <i>P1a</i> and <i>P2a</i> on II–VI, and <i>P2a</i> on VII filiform and longer than <i>P1</i> (Fig. 20A); <i>P1a</i> on VII sensillum-like and about one-third length of <i>P1</i>, posterior to <i>P1–P2</i> (Fig. 20B); on tergite VIII (Fig. 20C) <i>P1a'</i> oblong and anterior to <i>P2</i>; <i>P1a'</i> and <i>P2</i> nearly the same level with <i>M4</i>; <i>P2a</i> linear. <b>Diagnosis.</b> This species is similar to <i>E. udagawai</i> Imadaté from Japan (Imadaté, 1961b, 1974b, 1995), Korea (Imadaté &amp; Szeptycki, 1976) and Taiwan (Chao &amp; Chen, 1996) and <i>E. orientalis</i> Yin from China (Yin, 1965, 1999) in the absent or rudimentary foretarsal sensillum <i>c'</i>, possession of a long empodium on hind tarsus, two anterior and seven posterior setae on abdominal tergite VIII, and six setae on abdominal sternites IX–X. However, this new species differs from <i>E. udagawai</i> in the presence of labral setae (absent in <i>E. udagawai</i>) and the short empodium on middle tarsus (1/3 of claw length in <i>E. udagawai</i>), and from <i>E. orientalis</i> in pseudoculus with no inner structure (three striae present in <i>E. orientalis</i>) and five pairs of anterior setae on abdominal tergites V–VI (four pairs in <i>E. orientalis</i>). <b>Etymology.</b> The specific name refers to the similarity and long confusion of this species with <i>E. udagawai</i>. <b>Distribution.</b> Japan (Honshu and Okinawa).
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 35-38
description: {"references": ["Imadate, G. (1961 b) Two new proturan species of the genus Eosentomon Berlese from Japan. Kontyu, Tokyo, 29, 132 - 140.", "Imadate, G. (1974 b) Fauna Japonica. Protura (Insecta). Keigaku Publishing Company, Ltd., Tokyo, 351 pp.", "Imadate, G. &amp; Szeptycki, A. (1976) The Proturans from North Korea. Bulletin of the National Science Museum, Tokyo, Series A (Zoology), 2, 267 - 276", "Chao, R. F. &amp; Chen, C. S. (1996) The genus Eosentomon from Taiwan (Protura: Eosentomidae). Chinese Journal of Entomology, 16, 303 - 321.", "Yin, W. Y. (1965) Studies on Chinese Protura. I. Ten species of the genus Eosentomon from Nanking-Shanghai regions. Acta Entomologica Sinica, 14, 71 - 92. (In Chinese with English summery)", "Yin, W. Y. (1999) Protura, Fauna Sinica, Arthropoda. Science Press, Beijing, China, 510 pp., 8 pls. (In Chinese with English summary)"]}