Pseudanisentomon villaticum, Nakamura, 2021

Nakamura, Osami, 2021, Three New Species of the Family Eosentomidae (Protura) from the Nasu Imperial Villa, Central Japan, Species Diversity 26 (1), pp. 111-125 : 119-123

publication ID	https://doi.org/ 10.12782/specdiv.26.111
publication LSID	lsid:zoobank.org:pub:A1208587-E61D-47C0-809D-54172EA24DD9
persistent identifier	https://treatment.plazi.org/id/F0B6844B-9115-4E68-AC16-F7AABE27215E
taxon LSID	lsid:zoobank.org:act:F0B6844B-9115-4E68-AC16-F7AABE27215E
treatment provided by	Felipe
scientific name	Pseudanisentomon villaticum
status	sp. nov.

Treatment

Pseudanisentomon villaticum sp. nov.

( Figs 5–8 View Fig View Fig View Fig View Fig ; Table 3)

Pseudanisentomon sp. : Nakamura 2019: 18 (partim).

Diagnosis. Foretarsal sensilla b ′ 1, c ′ and seta x absent, a nearer to γ1 than to γ2, f1 broad and long; long empodium on hind tarsus; abdominal tergite VII with three pairs of anterior setae (A2, 4, 5), 1 and 2 rudimentary on X; sternites IX–X with six setae.

Specimens examined. Holotype: female (NSMT-Ap 551), the Nasu Imperial Villa, Nasu-machi, Tochigi Prefecture, 37.1100°N, 140.0158°E, elev. 919 m, secondary forest dominated by Q. crispula and P. densiflora , 15 October 2013, K. Furuno et al. leg. Paratypes (n=10): one female (NSMT-Ap 552), same data as for the holotype; same locality as for the holotype, two males (NSMT-Ap 553, 554), 7 October 2011, one female (NSMT-Ap 555), 11 June 2012, one male, one female (TPM-IV-14031, 14032), 7 December 2012, one male (TPM-IV-14033), 27 October 2015, K. Furuno et al. leg.; 37.1102°N, 140.0152°E, elev. 928 m, one male (SMNH-Ap-36645), 27 October 2015, K. Furuno et al. leg.; 37.1105°N, 140.0150°E, elev. 929 m, one male (SMNH-Ap-36646), 15 October 2013, K. Furuno et al. leg.; 37.1102°N, 140.0161°E, elev. 918 m, one female (SMNH- Ap-36647), 15 October 2013, K. Furuno et al. leg.

Other material examined (n=18): one female and one larva II, same data as for the holotype; same locality as for the holotype, one female and one larva II, 7 October 2011, one larva II and one larva I, 5 September 2012, one larva II, 7 November 2012, one female and one larva II, 15 October 2013, one larva II, 17 October 2015; 37.1102°N, 140.0152°E, elev GoogleMaps . 928 m, one male, 27 October 2015; 37.1105°N, 140.0150°E, elev. 929 m, one male and one larva II, 11 December 2011, one female, 7 November 2013; 37.1102°N, 140.0161°E, elev. 918 m, one male, 11 December 2011, one female, 15 October 2013, two females, 27 October 2015.

Description. Body length. 663 (592–715) µm.

Head. 102 (96–104) µm long, 68 (69–72) µm wide. Anterior and posterior additional setae, and seta m4 present; anterior and posterior sensilla present ( Fig. 5A View Fig ); median subposterior seta length, 8 (7–9) µm, 1.2 times longer than median posterior seta, 7 (7) µm; a pair of rudimentary sensilla posterior to pseudoculus rudimentary. Labral setae present ( Fig. 5B View Fig ). Rostral seta length 13 (11–13) µm, longer than subrostral seta, 11 (10–12) µm, ( Fig. 5B View Fig ). On maxillary palpus ( Fig. 5C View Fig ) dorsal sensillum (md), 6 (5–6) µm, longer than lateral sensillum (ml), 4 (4–5) µm. On galea ( Fig. 5D View Fig ), all digits similar in shape and length. Mandible with two teeth ( Fig. 5E View Fig ). Clypeal apodeme distinct ( Fig. 5A, B View Fig ). Pseudoculus with a weak central mark ( Fig. 5F View Fig ), 9 (8–11) µm long, PR=12 (10–13).

Legs. Foretarsus length ( Fig. 6A–D View Fig ) 68 (63–68) µm; claw 12 (12–13) µm, TR=5.8 (4.9–5.7); empodium 12 (12–13) µm, EU=1.0 (0.9–1.0); sensillum s longer than claw, 15 (14–16) µm. Sensillum t1 nearer to α3 than to α3 ′, BS=0.9 (0.8–0.9); t2 thin; t3 broad, surpassing base of α7; a broad, slightly closer to γ1 than to γ2; b narrowly spatulate, surpassing base of β6; c broad, almost reaching base of γ3; d broad, reaching base of t3; e absent; g rounded spatulate and large; f1 broad, surpassing base of γ5; f2 thin; a ′ slightly broad; b ′ 1 absent; b ′ 2 small, narrowly spatulate; c ′ absent; seta x absent. A pore posterior to γ5. Length of middle tarsus 32 (31–33) µm, length of claw 10 (10–11) µm, empodium short, about 1/5 of claw length, 2 (2) µm ( Fig. 6E View Fig ); hind tarsus 39 (37–39) µm, claw 11 (10–11) µm; empodium longer than 2/3 of claw length ( Fig. 6F View Fig ), 7 (7–9) µm long; on hind tarsus ( Fig. 6F View Fig ), D2 and D4 spine-like.

Chaetotaxy. Chaetotaxy as in Table 3 and Fig. 7A–D View Fig . On thoracic tergites II–III ( Fig. 7A View Fig ), P1a and P2a seta-like; P1a posterior to P1-P2; P2a on II slightly nearer to P2 than to P3; P2a on III halfway between P2 and P3 or slightly nearer to P2 than to P3; on II P1a length 9 (8–10) µm, shorter than P1, 11 (10–11) µm; on III P1a length 9 (9–10) µm, subequal to P1, 11 (10–11) µm; P2a on II–III 7 (5–7) and 8 (6–8) µm, respectively, shorter than P1a. Abdominal tergites II–IV with five pairs of anterior setae (A1-5), V–VI with four pairs (A1, 2, 4, 5); VII with three pairs (A2, 4, 5); IX–X with 4 setae, but 1 and 2 on X rudimentary ( Fig. 7C View Fig ). P1a on abdominal tergite I, P1a and P2a on II–VI and P2a on VII delicate and longer than P1, but P2a on VII subequal to P 1 in length; P1a on VII short, 1/3–1/4 of P 1 in length, 5 (5–6) µm long, at hind margin ( Fig. 7B View Fig ); on VIII ( Fig. 7C View Fig ), P1a ′ falcate and slightly anterior to P2, P2a ′ falcate. Setae on thoracic and abdominal sternites all normal; VIII with two anterior and seven posterior setae; IX–X with six setae ( Fig. 7D View Fig ).

Porotaxy. Abdominal sternites VIII–X with one medial pore ( Fig. 7D View Fig ). Telson with one ventral medial pore.

Genitalia. On female squama genitalis ( Fig. 6G View Fig ) caput processus bent against the median edge of stylus in a sharp angle, outer and inner edges of corpus processus sclerotized; filum processus long; proximo-lateral sclerotization present; median sclerotization at posterior part of stylus. Male squama genitalis with short basiperiphallar setae ( Fig. 6H View Fig ).

Larva II (n=7). Body length 488–559 µm. Head length 85–95 µm; pseudoculus 8–9 µm long, PR=11. Foretarsus length 59–60 µm; claw 11–12 µm, TR=4.5–5.0; empodium10–12 µm, EU=0.9–1.0; sensillum s 14 µm; shape and position of foretarsal sensilla same as those of imago; BS=0.8– 0.9. Length of middle tarsus 25–26 µm, length of claw 9 µm, empodium 2 µm long; hind tarsus 31–33 µm, claw 9–10 µm, empodium 5–8 µm. P5 on abdominal tergites II and III displaced anteriorly and at same level with A4 on III ( Fig. 8A View Fig ). P1a on abdominal tergite VIII distal to P2 ( Fig. 8B View Fig ).

Larva I (n=1). Body length 462 µm. Head 91 µm long; pseudoculus indistinct. Foretarsus length 54 µm; claw 11 µm, TR=4.9; empodium 11 µm, EU=1.0; sensillum s 13 µm; shape and position of foretarsal sensilla same as those of preceding stages. Length of middle tarsus 23 µm, length of claw 9 µm, empodium 2 µm long; hind tarsus 28 µm, claw 10 µm, empodium 7 µm.

Remarks. This new species differs from all its congeners by the three pairs of anterior setae on abdominal tergite VII (four pairs in other species). Nakamura (2010; table 2) incorrectly described tergite VII as having three pairs of anterior setae (A2, 4, and 5) in for P. donan Nakamura, 2010 ; however, it actually has four pairs of setae (A1, 2, 4, and 5), as shown in the following figure: Nakamura (2010: fig. 6D). Aside from this feature, this new species resembles P. songkiangensis by lacking foretarsal sensilla b ′ 1 and c ′ and by a being situated nearer to γ1; however, it is discriminated from P. songkiangensis by the length of the empodium on the middle tarsus (longer in P. songkiangensis ) and the lengths of foretarsal sensilla t3, d, and f1 (shorter in P. songkiangensis ).

Distribution. Japan, known only from the Nasu Imperial Villa.

Etymology. The specific name is derived from the Nasu

Imperial Villa, the type locality.