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

description: <i>Eosentomon impar</i> Nakamura sp. nov. Fig. 27; Table 11 <b>Type specimens.</b> Holotype female (NSMT –Ap 481), Kenmarubi, Mt. Fuji, Fujiyoshida–shi, Yamanashi Prefecture, 35º27'06"N, 138º45'12"E, 1060 m elevation, litter of a forest dominated by <i>P. densiflora</i>, 22-IX-2001, R. Itoh leg. Paratypes: 3 females (NSMT –Ap 482–484), same data as for the holotype; 1 female (NSMT –Ap 485), Mt. Komaga–take, Kanegasaki–cho, Iwate Prefecture, 39º11'21"N, 140º55'41"E, 920 m elevation, litter of a forest dominated by <i>F. crenata</i>, 18-VIII-2001, H. Tamura <i>et al.</i> leg.; 1 female (NSMT –Ap 486), Otaki, Chichibu–shi, Saitama Prefecture, 35º56'58"N, 138º53'57"E, 900 m elevation, 1-V-1991, Y. Kuwabara leg.; 2 females (NSMT – Ap 487–488), Busseki, Nakatsugawa, Chichibu–shi, Saitama Prefecture, 35º59'44"N, 138º49'30"E, 670 m elevation, litter of a forest dominated by <i>F. crenata</i> and <i>Q. crispula</i>, 26- IV- 1988, K. Machida leg.; 2 females (NSMT –Ap 489–490), Omaru–yama, Kamikuisshiki–mura, Yamanashi Prefecture, 35º26'32"N, 138º38'26"E, 1130 m elevation, litter of a forest dominated by <i>F. crenata</i> and <i>Q. crispula</i>, 18- IV- 2001, R. Itoh leg. <b>Other specimens examined.</b> One female, Mt. Iwate –san, Takizawa –mura, Iwate Prefecture, 39º50'29"N, 141º01'22"E, 1080 m elevation, litter of a forest dominated by <i>Q. crispula</i>, 28-VI-1985, O. Nakamura leg.; 1 female, Bato –machi, Tochigi Prefecture, 36º45'57"N, 140º08'52"E, 150 m elevation, litter of a forest dominated by <i>Quercus serrata</i>, 8-VII-2002, Y. Hagiwara leg. <b>Description.</b> Body length 605 µm (605–852 µm). Head 104 (96–107) µm long, 80 (68–84) µm wide. Setae and sensilla on head similar to the preceding species (Figs. 27A, C, F); seta <i>sp</i> 1.3 (1.2–1.7) times longer than <i>p</i>; seta <i>rs</i> inflated, as long as <i>sr</i> (Fig. 27B). On galea (Fig. 27D) digit O longer than M and I, M and I close to each other. Mandible with 3 teeth (Fig. 27E). Clypeal apodemes distinct (Figs. 27A, B). Pseudoculus circular (Fig. 27F), 11 (9–11) µm long, PR = 9 (9–11). Foretarsus length (Figs. 27G–I) 69 (59–71) µm; claw 15 (14–16) µm, TR = 4.9 (4.4–5.1); empodium as long as claw, 15 (13–16) µm, EU = 1.0; sensillum <i>s</i> slightly longer than claw, 16 (16–17) µm. Sensillum <i>t1</i> closer to α <i>3</i> than to α <i>3</i> ', BS = 0.9 (0.8–0.9); <i>t2</i> thinly spatulate; <i>t3</i> broadened, reaching base of α <i>7</i>; <i>a</i> not reaching base of γ <i>2</i>; <i>b</i> spatulate; <i>c</i> reaching nearly to base of γ <i>3</i>; <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> reaching base of γ <i>5</i>; <i>a'</i> at same level with α <i>3</i>; <i>b'1</i> nearer to δ <i>3'</i> than to δ <i>4',</i> slightly broadened and almost reaching base of δ <i>4'</i>; <i>b'2</i> thin; <i>c'</i> absent. Length of middle tarsus 36 (29–38) µm, length of claw 11 (9– 11) µm; hind tarsus 45 (36–45) µm, claw 11 (10–13) µm; both empodia short (Figs. 27J, K), 3 (1–2) µm long; on hind tarsus (Fig. 27K) <i>D2</i> and <i>D4</i> spine-like, but more slender than <i>D5</i>. Tracheal camerae distally contracted (Fig. 27L). Central lobe trapezoidal and inner line constricted in middle (Fig. 27M). Laterostigmata II–IV large, with no inner structure; those on V–VII small. On female squama genitalis (Fig. 27N) S-shaped sclerotization on processus sternalis, caput processus of duck’s head-type, filum processus long. Male unknown. Chaetotaxy as in Table 11. 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</i>. <i>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>; <i>P1a</i> on VII sensillum-like and about one-third length of <i>P1</i>, posterior to <i>P1–P2</i>; on tergite VIII <i>P1a'</i> oblong and anterior to <i>P2</i> (Fig. 27O); <i>P1a'</i> and <i>P2</i> nearly the same level with <i>M4</i>; <i>P2a</i> linear. Setae <i>1</i> and <i>2</i> on abdominal tergite XI microchaetae. A pair of ventral anterior setae on telson small and sensillum-like. <b>Diagnosis.</b> The present species is similar to <i>E. brevicorpusculum</i> Yin and <i>E. dissimilis</i> Yin from China (Yin 1965, 1979, 1999) in many respects, but this new species is different in the absence of foretarsal sensillum <i>c'</i> (present in the latter two). Moreover the present species is different from <i>E. brevicorpusculum</i> in having four pairs of anterior setae on abdominal tergites V–VI (five pairs in <i>E. brevicorpusculum</i>), and from <i>E. dissimilis</i> in three pairs of anterior setae on the abdominal tergite VII (four pairs in <i>E. dissimilis</i>) and the length of foretarsal sensillum <i>b'1</i> reaching nearly to base of δ <i>4'</i> (not reaching base of δ <i>4</i> in <i>E. dissimilis</i>). The present species is also similar to <i>E. udagawai</i>, <i>E. taiwanense</i> Nakamura, 1997 from Taiwan (Nakamura, 1997) and <i>E. pusillum</i> Ewing from Michigan, Florida and Carolina, USA (Ewing, 1940; Bernard, 1990), but it is easily distinguished by the long empodium on the hind tarsus (short in this new species). Chaetotaxic variations observed consisted of the asymmetric absences of <i>P1</i> on the abdominal tergite III in one female and <i>A3</i> on the abdominal sternite III in another female from Mt. Fuji. <b>Etymology.</b> The specific name is the Latin word for “unequal” and referes to the long inclusion of this species in <i>E. udagawai</i> and its allies. <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 49-52
description: {"references": ["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. (1979) Studies on Chinese Protura: A new genus and six new species of Eosentomidae from Shanghai. Acta Entomologica Sinica, 22, 77 - 89. (In Chinese with English abstract)", "Yin, W. Y. (1999) Protura, Fauna Sinica, Arthropoda. Science Press, Beijing, China, 510 pp., 8 pls. (In Chinese with English summary)", "Nakamura, O. (1997) Protura from Taiwan. Edaphologia, 59, 17 - 53.", "Ewing, H. E. (1940) The Protura of North America. Annals of the Entomological Society of America, 33, 495 - 551.", "Bernard, E. C. (1990) New species, clarifications, and changes in status within Eosentomon Berlese (Hexapoda: Protura: Eosentomidae) from the United States. Proceedings of the Biological Society of Washington, 103, 861 - 890."]}