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

description: <i>Eosentomon ateruii</i> Nakamura sp. nov. Fig. 13; Table 4 <b>Type specimens.</b> Holotype female (NSMT –Ap 462), Mt. Komaga –take, Kanegasaki –machi, Iwate Prefecture, 39º11'21"N, 140º55'41"E, 820 m elevation, 18-VIII-2001, litter of a forest dominated by <i>F. crenata</i>, H. Tamura <i>et al.</i> leg. Paratype: 1 female (NSMT –Ap 463), same data as for the holotype. <b>Description.</b> Body length 800 (754) µm. Head 95 (94) µm long, 62 µm wide. Seta <i>aa</i>, <i>pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 13A); seta <i>sp</i> equal to <i>p</i> in length; sensilla <i>pp</i> rudimentary. Labral setae absent (Fig. 13B). Seta <i>rs</i> inflated and equal to <i>sr</i> in length (Fig. 13B). On maxillary palpus (Fig. 13C) sensilla <i>md</i> and <i>ml</i> similar to each other in shape and length. On galea (Fig. 13D) digit O longer than M and I, M and I close to each other. Mandible with three teeth (Fig. 13E). Clypeal apodemes distinct (Figs. 13A, B). Pseudoculus 10 (11) µm long, without inner structure (Fig. 13A), PR = 10 (9). Foretarsus length (Figs. 13F, G) 60 (62) µm; claw 12 (13) µm, TR = 5.2 (5.1); empodium 13 (13) µm, EU = 1.1 (1.0); sensillum <i>s</i> longer than claw, 14 (16) µm. Sensillum <i>t1</i> closer to α <i>3</i> than to α <i>3’</i>, BS = 0.8 (0.9); <i>t2</i> thin; <i>t3</i> thick, surpassing base of α <i>7</i>; <i>a</i> near γ <i>1</i>; <i>b</i> almost reaching base of β <i>6</i>; <i>c</i> broadened, reaching base of γ <i>3</i>; <i>d</i> broadened, reaching base of <i>z</i>; <i>e</i> and <i>g</i> roundedly spatulate and long; <i>f1</i> spatulate; <i>f2</i> thin; <i>a'</i> posterior to δ <i>3'</i>, reaching nearly to level of α <i>3’</i>; <i>b'1</i> nearer to δ <i>3'</i> than to δ <i>4’</i>; <i>b'2</i> linear; <i>c'</i> absent. Length of middle tarsus 26 (28) µm, length of claw 9 µm, empodium short, 1 µm long; hind tarsus 32 (34) µm, claw 10 µm, empodium long (Fig. 13H), 8 (7) µm; on hind tarsus (Fig. 13H) <i>D2</i> and <i>D4</i> spine-like, but more slender than <i>D5</i>. Tracheal camerae contracted distally (Fig. 13I). Central lobe incised (Fig. 13J). Laterostigma II–III distinct, without inner structure. On female squama genitalis (Figs. 13K, L) caput processus of duck’s head-type, median sclerotization developed, proximo-lateral sclerotization present. Male unknown. Chaetotaxy as in Table 4. 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. 13M); <i>P1a</i> on VII sensillum-like and about one-third length of <i>P1</i>, 5 µm long, at hind margin (Fig. 13N); 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 (Fig. 13O); <i>1</i> and <i>2</i> on tergite XI microchaetae. A pair of ventral anterior setae on telson small and sensillum-like. <b>Diagnosis.</b> This new species is similar to <i>E. novemchaetum</i> Yin and <i>E. dimecempodi</i> Yin from China (Yin, 1965, 1990, 1999) in possessing two anterior and nine posterior setae on the abdominal sternite VIII, but differs from <i>E. novemchaetum</i> in the shapes of broadened sensilla <i>t3</i>, <i>c</i> and <i>d</i> on foretarsus (linear in <i>E. novemchaetum</i>), and from <i>E. dimecempodi</i> in having the pseudoculus without inner structure (with three longitudinal lines in <i>E. dimecempodi</i>), the short empodium on the middle tarsus (long in <i>E. dimecempodi</i>) and the shapes of broadened sensilla <i>t3</i> and <i>c</i> on foretarsus (linear in <i>E. dimecempodi</i>). Chaetotaxic variation observed consisted of the asymmetric absence of <i>A2</i> on abdominal tergite IV of one female. <b>Etymology.</b> The specific name is named after "Aterui", who was a distinguished chieftain of the Hitakami district, as the present Isawa district containing the type locality was called 1200 years ago. <b>Distribution.</b> Japan (Honshu, known only from the type locality).
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 25-27
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