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

description: <i>Eosentomon yambaru</i> Nakamura sp. nov. Figs. 55–56; Table 23 <b>Type specimens.</b> Holotype female (NSMT –Ap 526), Mt. Nishime –dake, Kunigami –son, Okinawa Island, Okinawa Prefecture, 26°47'48''N, 128°16'29''E, 327 m elevation, 6-VII-2001, S. Karasawa <i>et al.</i> leg. Paratypes: 2 males (NSMT –Ap 527–528), same data as for the holotype. <b>Other specimens examined.</b> One male, one maturus junior, same locality as for the holotype, 27-II-2003, S. Karasawa <i>et al.</i> leg. <b>Description.</b> Body length 741 (748–830) µm. Head 128 (122–128) µm long, 97 (96) µm wide. Setae <i>aa</i>, <i>pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 55A); seta <i>sp</i> 1.7 times longer than <i>p</i>; sensilla <i>pp</i> rudimentary. Labral setae present (Fig. 55B). Seta <i>rs</i> inflated, shorter than <i>sr</i> (Fig. 55B). On maxillary palpus (Fig. 55C) sensillum <i>md</i> distinctly longer than <i>ml.</i> On galea (Fig. 55D) digit O slightly longer than M and I. Mandible with two or three teeth (Fig. 55E). Clypeal apodemes distinct (Figs. 55A, B). Pseudoculus without inner structure (Figs. 55A, F), 10 (10–11) µm long, PR = 13 (11–12). Foretarsus length (Figs. 55G, H) 107 (108–109) µm; claw 22 (22) µm, TR = 5.1 (5.0–5.1); empodium 22 (22) µm, EU = 1.0; sensillum <i>s</i> as long as claw. Sensillum <i>t1</i> slightly nearer to α <i>3'</i> than α <i>3</i>, BS = 1.2 (1.0–1.2); <i>t2</i> thin; <i>t3</i> thin, surpassing tarsus; <i>a</i> broadened; <i>b</i> surpassing base of β <i>6</i>; <i>c</i> linear; <i>d</i> reaching base of <i>f2</i>; <i>e</i> and <i>g</i> roundedspatulate and long; <i>f1</i> thin, reaching base of γ <i>5</i>; <i>f2</i> shorter than <i>f1</i>; <i>a'</i> slightly broadened, reaching base of <i>b’1</i>; <i>b'1</i> between bases of δ <i>3'</i> and δ <i>4'</i>, reaching base of <i>b’2</i>; <i>b'2</i> reaching base of α <i>6</i>; <i>c'</i> anterior to α <i>6</i>, reaching base of δ <i>6</i>. Length of middle tarsus 53 (47–52) µm, length of claw 16 (15–16) µm; hind tarsus 67 (63–66) µm, claw 18 (16– 17) µm; both empodia short and less than 1/7 of claw length (Fig. 55I), 2 µm long; on hind tarsus (Fig. 55I) <i>D2</i> and <i>D4</i> spine-like, <i>D4</i> more slender than <i>D2</i>. Tracheal camerae short and distally contracted. Central lobe trapezoidal and inner line incised (Fig. 56A). Laterostigmata II –IV large, with no inner structure; those of V and VI small. On female squama genitalis (Fig. 56B) caput processus of duck’s head type, filum processus short, small accessory sclerotization present, proximo-lateral sclerotization present. Male squama genitalis with short basiperiphallar setae. Chaetotaxy as in Table 23. 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 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, but shorter than <i>P1</i>; <i>P1a</i> on VII short, slightly capitulate (Fig. 56E), 4 µm long, at hind margin; on tergite VIII (Fig. 56F) <i>P1a'</i> with basal dilatation and slightly anterior to <i>P2</i>; <i>P2a'</i> short linear. <b>Diagnosis.</b> The present species is similar to <i>E. riyuetanense</i> Nakamura from Taiwan (Nakamura, 1997) and <i>E. daii</i> Yin from China (Yin, 1982, 1999). These three species have in common a pseudoculus without inner structure, the position of <i>P1a</i> at the hind margin of abdominal tergite VII, foretarsal sensillum <i>t1</i> near α <i>3'</i>, and the presence of <i>b'1</i>. However, this new species is different from <i>E. riyuetanense</i> in having two pairs of anterior setae on abdominal tergite VI (three pairs in <i>E. riyuetanense</i>), seta <i>rs</i> shorter than <i>sr</i> (same length as <i>sr</i> in <i>E. riyuetanense</i>), capitulate <i>P1a</i> on abdominal tergite VII (linear in <i>E. riyuetanense</i>) and basal dilatation of <i>P1a'</i> on abdominal tergite VIII (not dilated in <i>E. riyuetanense</i>); and from <i>E. daii</i> in having three, two and one pairs of anterior setae on abdominal tergites V–VII, respectively, (four pairs on V–VI and two pairs on VII in <i>E. daii</i>), and the presence of median sclerotization on the female squama genitalis (absent in <i>E. daii</i>). <b>Etymology.</b> The specific name, a noun in apposition, is derived from the name of the northern part of Okinawa Island, Yambaru, where the type locality is involved. <b>Distribution.</b> Japan (Okinawa, known from only 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 page 99
description: {"references": ["Nakamura, O. (1997) Protura from Taiwan. Edaphologia, 59, 17 - 53."]}