Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701 Nakamura, Osami Zootaxa 2010 2010-12-03 2701 1 109 Nakamura Nakamura 2010 [151,623,1453,1479] Entognatha Eosentomidae Eosentomon Animalia Protura 26 27 Arthropoda species bracychaetum sp. nov.   Figs. 14–15; Table 5   Type specimen.  Holotypefemale ( NSMT–Ap 464), Mt. Hayachine–san, Monma, Kawai–mural, Iwate Prefecture; litter of a forest dominated by  Picea glehnii;  6-XI-2000; T. Fujikawaleg.   Description.Body length 1287 µm. Head 139 µm long, 120 µm wide. Setae aa, paand m4present, sensilla asand pspresent ( Fig. 14A); seta sp1.6 times longer than p; sensilla pprudimentary. Labral setae present ( Fig. 14B). Seta rsinflated, shorter than sr( Fig. 14B). On maxillary palpus ( Fig. 14C) sensillum mdsimilar to mlin shape and length. On galea ( Fig. 14D) digit O longer than M and I. Mandible with three teeth ( Fig. 14E). Clypeal apodemes distinct ( Figs. 14A, B). Pseudoculus with very faint lines, 15 µm long, PR= 10. Foretarsus length ( Figs. 14F, G) 105 µm; claw 22 µm, TR = 5.0; empodium 22 µm, EU = 1.0; sensillum sslightly longer than claw. Sensillum t1closer to α 3'than to α 3, BS = 1.1; t2thin; t3thin, not surpassing tarsus; anot reaching base of γ 2; blinear; clinear, not reaching base of γ 3; dthin, surpassing base of α 5; eand gspatulate and long; f1long, surpassing base of γ 5; f2small; a'linear; b'1absent; b'2thin; c'small. Pores close to α 3'and y, respectively. Length of middle tarsus 53 µm, length of claw 14 µm; hind tarsus 67 µm, claw 18 µm; empodia on both tarsi short and about 1/5 of claw length ( Fig. 14H). On hind tarsus ( Fig. 14H) D2and D4spine-like.   FIGURE 14.  Eosentomon brachychaetum  sp. nov., holotype, female. A, dorsal view of head, right side; B, labrum and rostral region; C, maxillary palpus; D, galea; E, mandible; F, exterior view of foretarsus; G, interior view of foretarsus; H, dorsal view of hind tarsus. Arrows show integumental pores. Scales: 20 µm.   FIGURE 15.  Eosentomon brachychaetum  sp. nov., holotype, female. A, tracheal camerae on thoracic tergite II; B, central lobe on abdominal tergite VI; C, laterostigmata II-IV; D, female squama genitalis; E, posterior setae on abdominal tergites IV; F, posterior setae on abdominal tergites VI; G, posterior setae on abdominal tergites VII; H, posterior margin of abdominal tergite VIII. Scales: 20 µm. Tracheal camerae distally contracted ( Fig. 15A). Side parts of central lobe visible, but central part indistinct ( Fig. 15B). Laterostigmata II–IV distinct and large, with a central pore ( Fig. 15C); that on V small. On female squama genitalis of swani-group ( Fig. 15D) caput processus being curved towards median edge of stylus at a sharp angel, corpus processus slender and continuing forward to the sharp angle of caput processus, filum processus long; median and proximo-lateral sclerotization present. Male unknown. Chaetotaxy as in Table 5. On thoracic tergites II–III, P1aseta-like, posterior to P1–P2; P2aseta-like, between P2and P3. P1aon abdominal tergites II–V sensillum-like, about a half length of P1( Fig. 15E), those on VI about one-third length of P1( Fig. 15F), those on VII about one-fourth length of P1( Fig. 15G); P2aon II–V filiform and longer than P1( Fig. 15E); those on VI filiform and as long as P1( Fig. 15F); those on VII filiform, but shorter than P1( Fig. 15G); on tergite VIII ( Fig. 15H) P1a'without basal dilatation and anterior to P2; P2alinear.   Diagnosis.Among the  swani-group of Tuxen (1964), this species resembles  E. imadateiTuxen,  E. swaniWomersleyfrom Australia( Tuxen, 1964, 1967; Womersley 1932, 1939) and  E. yinaeSzeptycki & Imadatéfrom North Korea( Szeptycki & Imadaté, 1987) in lacking foretarsal sensillum b'1and possessing two anterior and seven posterior setae on the abdominal sternite VIII. The present species and  E. yinaeare different from other two species in the positions of foretarsal sensilla t1posterior to α 3'(at same level with α 3'in  E. imadateiand  E. swani) and a'at same level with α 3(distal to α  3in  E. imadateiand  E. swani), five pairs of anterior setae on abdominal tergite IV (less than five pairs in  E. imadateiand  E. swani), six setae on sternites IX–X (four setae in  E. imadateiand  E. swani), and the length of P1ashorter than P1on the abdominal tergites V–VI (longer than P 1in  E. imadateiand  E. swani). This new species is distinguished from  E. yinaein the shapes of inflated seta rs(not inflated in  E. yinae) and of P1ashorter than P1on the abdominal tergites I–IV (longer than P 1in  E. yinae).   Etymology.The specific name is derived from the short P1aon abdominal tergites II–VII.   Distribution. Japan(Honshu, known only from the typelocality). 2000-11-06 NSMT, T Fujikawa Mt. Hayachine Kawai Monma 26 27 1 Iwate holotype