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

description: <i>Pseudanisentomon parvum</i> Nakamura sp. nov. Figs. 8–9; Table 3 <b>Type specimens.</b> Holotype female (NSMT –Ap 454), Tochimoto, Otaki, Chichibu –shi, Saitama Prefecture, 900 m elevation, 35º56'57"N, 138º53'47"E, 1-V-1991, Y. Kuwabara leg. Paratypes: 4 males (NSMT –Ap 455–458), 3 females (NSMT –Ap 459–461), same data as for the holotype. <b>Description.</b> Body length 943 (780–988) µm. Head 97 (91–100) µm long, 62 (60–66) µm wide. Setae <i>aa</i>, <i>pa</i> and <i>m4</i> present, sensilla <i>as</i> and <i>ps</i> present (Fig. 8A); seta <i>sp</i> 1.3 (1.2–1.3) times longer than <i>p</i>; sensilla <i>pp</i> distinct (Fig. 8B). Labral setae present (Fig. 8C). Seta <i>rs</i> inflated, equal to <i>sr</i> in length (Fig. 8C). On maxillary palpus (Fig. 8D) sensillum <i>md</i> slightly longer than <i>ml</i>. On galea (Fig. 8E) digit O slightly longer than M and I, M and I equal length, but I slightly broadened distally. Mandible with three teeth (Fig. 8F). Clypeal apodemes indistinct. Pseudoculus almost circular, (8–9 µm long), inner depressions very weak and often invisible (Fig. 8G), PR = (12–13). Foretarsus length (Fig. 8H, I) 64 (63–69) µm; claw 12 (11–12) 12 µm, TR = 5.4 (5.9–6.2); empodium slightly shorter than claw, 10 (9–11) µm, EU = 0.8 (0.8–0.9); sensillum <i>s</i> slightly longer than claw, 13 (12–13) 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> thin; <i>t3</i> slightly broadened; <i>a</i> not reaching base of γ <i>2</i>; <i>b</i> and <i>c</i> surpassing level of β <i>6</i>; <i>d</i> slightly broadened; <i>e</i> absent; <i>f1</i> spatulate; <i>f2</i> thin and small; <i>g</i> rounded-spatulate and long; <i>a'</i> not reaching 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> thin; <i>c'</i> considerably longer than <i>t3</i>, reaching base of α <i>7</i>. Length of middle tarsus 26 (26–28) µm, length of claw 11 (9–10) µm, empodium about 1/2 of claw length (Fig. 8J), 5 (5–6) µm long; hind tarsus 34 (33–36) µm, claw 11 (9–11) µm, empodium longer than 2/3 of claw length (Fig. 8K), 8 (7–8) µm; on hind tarsus (Fig. 8K) <i>D2</i> seta-like; <i>D4</i> spine-like, but slender than <i>D5</i>. Tracheal camerae slender and long (Fig. 9A). Central lobe trapezoidal and inner line incised (Fig. 9B). Laterostigmata II–III distinct, without inner structure (Fig. 9C). On female squama genitalis (Fig. 9D) caput processus of duck's head type, corpus processus dissolved and rod-like, lateral sclerotization distinct, filum processus long. Male genitalis with long basiperiphallar setae (Fig. 9E). Chaetotaxy as in Table 3. 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>; <i>P1a</i> on VII sensillum-like, about a half length of <i>P1</i>, at hind margin (Fig. 9F); on tergite VIII (Fig. 9G) <i>P1a'</i> oblong and anterior to <i>P2</i>; <i>P1a'</i> and <i>P2</i> at almost same line between <i>M2</i> and <i>M4</i>; <i>P2a</i> linear. <b>Diagnosis.</b> Among the congeneric species, this new species is similar to <i>Ps. sininotialis</i> Zhang &amp; Yin and <i>Ps. minystigmum</i> (Yin) from China (Yin, 1979, 1999; Zhang &amp; Yin, 1984) in possessing foretarsus shorter than 80 µm, foretarsal sensillum <i>b'1</i>, the long empodia on hind and middle tarsus, a pair of anterior setae on abdominal sternite VIII, and six setae on sternites IX–XI. However, this species is distinguished from the above two by the inner structure of pseudoculus without striae (three distinct striae in latter two), five pairs of anterior setae on abdominal tergite IV (four pairs in latter two) and the length of foretarsal sensillum <i>c'</i> longer than <i>t3</i> (shorter than <i>t 3</i> in latter two). <b>Etymology.</b> The specific name refers to the relatively small size of this species. <b>Distribution.</b> Japan (Honshu, known only from 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 16-19
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