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

description: <i>Eosentomon imperiale</i> Nakamura sp. nov. Figs. 28–29; Table 12 <b>Type specimens.</b> Holotype female (NSMT –Ap 491), Imperial Palace, Chiyoda –ku, Tokyo, 35º41'05"N, 139º45'05"E, 20 m elevation, litter of a plantation of <i>Prunus</i> spp., 2-III-2000, O. Nakamura <i>et al.</i> leg. Paratype: 1 female (NSMT –Ap 492), same data as for the holotype. <b>Other specimens examined.</b> One female, Takado, Takahagi–shi, Ibaraki Prefecture, 36º43'05"N, 140º43'29"E, 30 m elevation, 2-XII-1988, litter of a forest dominated by <i>Castanopsis cuspidata</i> subsp. <i>cuspidata</i>, H. Tamura <i>et al.</i> leg.; 1 female, Akanagi –san, Tokorono, Nikko –shi, Tochigi Prefecture, 36º48'33"N, 139º34'07"E, 1760 m elevation, <i>Sasa</i> field, 21-IX-1996, K. Furuno <i>et al.</i> leg. <b>Description.</b> Body length 800 (630–852) µm. Head 95 (91–94) µm long, 61 (64–66) µm wide. Setae <i>aa</i>, <i>pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 28A); seta <i>sp</i> 1.3 (1.2) times longer than <i>p</i>; sensilla <i>pp</i> rudimentary. Labral setae present (Fig. 28B). Seta <i>rs</i> simple, longer than <i>sr</i> (Fig. 28B). On maxillary palpus (Fig. 28C) sensilla <i>md</i> and <i>ml</i> similar to each other in shape and length. On galea (Fig. 28D) digits small and similar to each other. Mandible with 2 teeth (Fig. 28E). Clypeal apodemes distinct (Fig. 28B). Pseudoculus 14 µm long, PR = 6. Foretarsus length (Figs. 28F, G) 63 (61–67) µm; claw 13 (12–13) µm, TR = 5.2 (5.2–5.5); empodium13 (11– 13) µm, EU = 1.1 (0.9–1.0); sensillum <i>s</i> longer than claw, 16 (16–18) µm. Sensillum <i>t1</i> closer to α <i>3</i> than to α <i>3’</i>, BS = 0.8; <i>t2</i> thinly spatulate; <i>t3</i> surpassing tarsus; <i>a</i> nearer to γ <i>1</i> than to γ <i>2</i>, not reaching base of γ <i>2</i>; <i>b</i> large and clubshaped; <i>c</i> linear, reaching base of γ <i>3</i>; <i>d</i> broadened and long, reaching nearly to base of α <i>7</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> thin; <i>b'1</i> broadened, nearer to δ <i>3’</i> than to δ <i>4 '</i>; <i>b'2</i> thin; <i>c'</i> absent. Length of middle tarsus 32 (30–33) µm, length of claw 9 (8–10) µm, empodium 6 (5–7) µm long; hind tarsus 39 (38–41) µm, claw 10 (9–11) µm, empodium 7 (6–7) µm; empodia of both tarsi longer than 1/2 of claw length (Figs. 28H, I); on hind tarsus (Fig. 28I) <i>D2</i> and <i>D4</i> spine-like; <i>D4</i> slightly thicker than <i>D2</i>, but more slender than <i>D5</i>. Tracheal camerae thick and short (Fig. 28J). Central lobe invisible. Laterostigmata II–IV large, with no structure (Fig. 28K). On female squama genitalis (Fig. 29A) S-shaped sclerotization on processus sternalis, caput processus of duck’s head type, alae processus rod-like, filum processus short. Male unknown. Chaetotaxy as in Table 12. 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> 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> (Fig. 29B); <i>P1a</i> on VII sensillum-like and about one-third length of <i>P1</i>, 5 µm long, at hind margin (Fig. 29C); on tergite VIII <i>P1a'</i> oblong and anterior to <i>P2</i>; <i>P1a'</i> and <i>P2</i> at almost same level with <i>M4</i>; <i>P2a</i> falcate; <i>1</i> and <i>2</i> on tergite XI microchaetae (Fig. 29F). A pair of ventral anterior setae on telson small and sensillum-like (Fig. 29G). <b>Diagnosis.</b> Among the species possessing two anterior and nine posterior setae on the abdominal sternite VIII, this new species is similar to <i>E. dimecempodi</i> in possessing long empodia on the middle and hind tarsi. However, it differs from <i>E. dimecempodi</i> in having the pseudoculus without inner structure (three longitudinal lines in <i>E. dimecempodi</i>) and the shapes of several foretarsal sensilla: broadened <i>t3</i> and linear <i>b’ 2</i> in the new species, linear <i>t3</i> and spatulate <i>b’ 2</i> in <i>E. dimecempodi</i>. <b>Etymology.</b> The specific name is derived from the type locality, the "imperial" palace. <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 52-55