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

description: <i>Eosentomon mizushimai</i> Nakamura sp. nov. Figs. 42–43; Table 17 <b>Type specimen.</b> Holotype female (NSMT –Ap 509), Komi, Iriomote Island, Okinawa Prefecture, 24º19'28"N, 123º54'09"E, litter from evergreen broad-leaved forest, 20 m elevation, 2-III-2002, S. Nagashima leg. <b>Description.</b> Body length 890 µm. Head length 129 µm. Setae <i>aa</i>, <i>pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 42A); seta <i>sp</i> 1.2 times longer than <i>p</i>; sensilla <i>pp</i> rudimentary. Labral setae present (Fig. 42B). Seta <i>rs</i> inflated, shorter than <i>sr</i> (Fig. 42B). On maxillary palpus (Fig. 42C) sensillum <i>md</i> as long as <i>ml</i>. On galea (Fig. 42D) digit O longer than M and I; I thicker than M. Mandible with three teeth (Fig. 42E). Clypeal apodemes indistinct. Pseudoculus 16 µm long, without inner structure (Fig. 42F), PR = 8. Foretarsus length (Figs. 42G, H) 86 µm; claw 17 µm, TR = 5.2; empodium 16 µm, EU = 0.9; sensillum <i>s</i> slightly longer than claw, 18 µm. Sensillum <i>t1</i> slightly nearer to α <i>3</i> than to α <i>3'</i>, BS = 1.2; <i>t2</i> thin; <i>t3</i> thin, surpassing base of α <i>7</i>; <i>a</i> not reaching base of γ <i>2</i>; <i>b</i> linear; <i>c</i> surpassing base of γ <i>3</i>; <i>d</i> basally broadened, surpassing base of <i>t3</i>; <i>e</i> and <i>g</i> roundedly spatulate and long; <i>f1</i> thin; <i>f2</i> slightly broadened; <i>a'</i> surpassing level of β <i>2</i>; <i>b'1</i> absent; <i>b'2</i> thin; <i>c'</i> very broadened, reaching praetarsus. A pore close to α <i>3'</i> as well as <i>y</i>. Length of middle tarsus 41 µm, length of claw 13 µm; hind tarsus 47 µm, claw 14 µm; empodia of both tarsi short (Fig. 42I), 3 µm long; on hind tarsus (Fig. 42I) <i>D2</i> and D4 spine-like, but <i>D4</i> slightly more slender than <i>D2</i>. Tracheal camerae short and broadened (Fig. 43A). Central lobe sinuate (Fig. 43B). Laterostigmata II–IV distinct (Fig. 43C), II–III with a central spot, IV without inner structure. On female squama genitalis (Fig. 43D) caput processus of duck’s head-type, filum processus long, proximo-lateral sclerotization distinct. Male unknown. Chaetotaxy as in Table 17. On thoracic tergites II–III, <i>P1a</i> and <i>P2a</i> seta-like, posterior to <i>P1–P2</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. 43E); <i>P1a</i> on VII sensillum and less than one-eighth length of <i>P1</i>, at hind margin (Fig. 43F); on tergite VIII (Fig. 43G) <i>P1a'</i> with basal dilatation and slightly anterior to <i>P2</i>; <i>P2a</i> linear. <b>Diagnosis.</b> This new species belongs to the <i>kumei</i> -group (Tuxen, 1964). It is similar to <i>E. kumei</i> from Japan (Imadaté, 1974b, 1995; Imadaté &amp; Yosii, 1959) and <i>E. dusun</i> Imadaté from Borneo (Imadaté, 1965b) in lacking the inner structure of pseudoculus and foretarsal sensillum <i>b'1</i>, and having two pairs of anterior setae (<i>A4</i>, <i>A5</i>) on abdominal tergites VI–VII, a single row of seven posterior setae on abdominal sternite VIII, and four setae on abdominal sternites IX–X. The new species differs from <i>E. kumei</i> and <i>E. dusun</i> in having five pairs of anterior setae on abdominal tergite IV (four pairs in <i>E. kumei</i> and <i>E. dusun</i>). This species is clearly separated from <i>E. kumei</i> by the length of foretarsal sensillum <i>a</i> surpassing level of β <i>2</i> (very short, not reaching level of β <i>2</i> in <i>E. kumei</i>) and the position of <i>P1a</i> posterior to <i>P1–P2</i> on the abdominal tergite VII (at same level with <i>P1–P 2</i> in <i>E. kumei</i>); and from <i>E. dusun</i> by the long,very broadened sensillum <i>c’</i> and basally broadened sensillum <i>d</i> on the foretarsus (short and thin <i>c’</i> and thin <i>d</i> in <i>E. dusun</i>), and <i>P1a</i> longer than <i>P1</i> on abdominal tergites II–VI (short in <i>E. dusun</i>). <b>Etymology.</b> The specific name is dedicated to Dr. Hiroki Mizushima, who kindly loan and offer of materials from Ryukyu Islands, including the present new species. <b>Distribution.</b> Japan (Okinawa, 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 73-76
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