Eosentomon longispine Nakamura, 2010

Nakamura, Osami, 2010, Taxonomic revision of the family Eosentomidae (Hexapoda: Protura) from Japan 2701, Zootaxa 2701, pp. 1-109 : 69-72

Eosentomon longispine Nakamura sp. nov.

Figs. 40–41; Table 16

Type specimens. Holotype female ( NSMT –Ap 506), Tochimoto, Otaki, Chichibu –shi, Saitama Prefecture, 35°56'58"N, 138°53'57"E, 900 m elevation, 1-V-1991, Y. Kuwabara leg. Paratypes: 2 males ( NSMT –Ap 507–508), same data as for the holotype .

Other specimens examined. One male, same data as for the holotype; 1 male, Ryugu, Oze moor, Katashina– mura, Gunma Prefecture, 36°55'59"N, 139°14'18"E, 1450 m elevation, 23-X-1994, litter of a forest dominated by F. crenata and Q. crispula, H. Sakayori et al. leg.

Description. Body length 962 (871) µm. Head 93 (93) µm long, 61 (61–63) µm wide. Setae aa, pa and m4 present, sensilla as and ps present ( Fig. 40A); seta sp as long as p; sensilla pp rudimentary ( Fig. 40F). Labral setae present ( Fig. 40B). Seta rs inflated, equal to sr in length ( Fig. 40B). On maxillary palpus ( Fig. 40C) sensillum md slightly longer and thinner than ml. On galea ( Fig. 40D) digit O longer and thicker than M and I. Mandible with 3 teeth ( Fig. 40E). Clypeal apodemes weakly visible ( Fig. 40B). Pseudoculus 13 (13) µm long, without inner structure ( Fig. 40F), PR = 7 (7).

Foretarsus length ( Figs. 40G, H) 63 (63) µm; claw 12 (13) µm, TR = 5.4 (4.9); empodium 12 (13) µm, EU = 1.0; sensillum s slightly longer than claw, 15 µm. Sensillum t1 closer to α 3 than to α 3’, BS = 0.8; t2 slightly spatulate; t3 surpassing base of z; a broadened, closer to γ 1 than to γ 2; b almost reaching base of e; c slightly broadened, reaching base of γ 3; d broadened, reaching base of α 7; e and g roundedly spatulate and long; f1 thinly spatulate; f2 broadened, reaching base of γ 5; a' at same level with α 3; b'1 nearer to δ 3' than to δ 4’; b'2 spatulate; c' absent. Length of middle tarsus 30 (28) µm, length of claw 9 (10) µm; hind tarsus 35 (36) µm, claw 10 (11) µm; empodia of both tarsi longer than 1/2 of claw length ( Figs. 40I, J); on hind tarsus ( Fig. 40J) D2 and D4 spine-like, but more slender than D5.

Tracheal camerae large, contracted distally ( Fig. 41A). Central lobe invisible. Laterostigmata II–III distinct, without inner structure. On female squama genitalis ( Fig. 41B) caput processus duck's head-like, proximo-lateral sclerotization present on posterior half of stylus. Male genitalis with short basiperiphallar setae.

Chaetotaxy as in Table 16. Thoracic and abdominal chaetotaxy almost identical to that of E. imperiale .

Diagnosis. Among the congeneric species possessing two anterior and nine posterior setae on the abdominal sternite VIII, this new species is similar to E. dimecempodi and E. imperiale in possessing long empodia on the middle and hind tarsi. This new species differs form E. dimecempodi in having a pseudoculus without inner structure (three longitudinal lines in E. dimecempodi ) and broadened foretarsal sensilla c and f2 (linear in E. dimecempodi ); and from E. imperiale in having inflated rs (simple in E. imperial ) and linear t3 and broadened f2 foretarsal sensilla (broadened t3 and linear f 2 in E. imperiale ).

Etymology. The specific name is derived from the long empodia on middle and hind tarsi.

Distribution. Japan (Honshu).