Eosentomon juni Imadaté

Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, Zootaxa 2701, pp. 1-109 : 59-60

Eosentomon juni Imadaté

Fig. 32

Eosentomon juni Imadaté, 1994b: 42 , figs. 1–4.

Specimens examined. Specimens deposited in NSMT: holotype male, NSMT–Ap 428, Mt. Poroshiri–dake, Niikappu, Hokkaido, 22-VIII-1977, J. Ohnishi leg.; allotype female, NSMT–Ap 429, Mt. Kirigishi–yama, Ashibetsu, Hokkaido, 1-X-1989, Y. Nagao leg. Two males, 1 maturus junior, 1 larva I, Kutsugata. Rishiri Island, Hokkaido, 45º10'48"N, 141º10'38"E, 200 m elevation, litter of a forest dominated by Abies sachalinensis and Picea jezoensis , with a ground cover of Sasa sp. , 21-VI-2000, T. Maehara leg.; 4 males, 1 female, 2 maturi juniores, Kutsugata, Rishiri Island, Hokkaido, 45º10'48"N, 141º10'38"E, 400 m elevation, litter of a forest dominated by A. sachalinensis and P. jezonensis , 20-VI-2000, T. Maehara leg.; 1 female, 1 larva II, Kutsugata, Rishiri Island, Hokkaido, 45º10'48"N, 141º10'38"E, 600 m elevation, litter of a forest dominated by Alnus maximowiczii and B. ermanii , with a ground cover of Sasa sp. , 22-VI-2000, T. Maehara leg.; 1 male, 1 female, 2 larvae II, 1 larva I, Kumagera–no–mori, Mt. Kushiishi–yama, Ajigasawa–machi, Aomori Prefecture, 40º31'06"N, 140º06'17"E, 520 m elevation, litter of a forest dominated by F. crenata , 2-X-1999, H. Tamura et al. leg.; 1 male, 1 larva II, Mt. Kushiishi–yama, Ajigasawa–machi, Aomori Prefecture, 40º31'18"N, 140º06'33"E, 630 m elevation, litter of a forest dominated by F. crenata , 3-X-1999, H. Tamura et al. leg.

Additions to description. On head, sensilla pp distinct ( Fig. 32A), 3 µm long. Labral setae present ( Fig. 32B).

Seta rs simple, shorter than sr ( Fig. 32B). On galea ( Fig. 32C) digit O longer than M and I; M and I similar to each other in shape and length. Mandible with two apical and one subapical teeth ( Fig. 32D). On hind tarsus D2 and D4 spine-like, D4 slightly thicker than D2, but more slender than D5. Central lobe incised, but very weak and often invisible ( Fig. 32E). Male genitalis with long basiperiphallar setae. On abdominal tergite VIII ( Fig. 32F) P1a' with slight basal dilatation and anterior to P2; P2a linear, 7 µm long.

Remarks. In his original description, Imadaté (1994c) described P1a' on the abdominal tergite VIII as not basally dilated. Close examination of the holotype and other specimens revealed that the setae have a slight basal dilatation. In Larva II, P5 on the abdominal tergites II–III is anteriorly displaced, on the metanotumon being at the same level A4 ( Fig. 32G).

Distribution. Japan (Hokkaido and Honshu).