Kenyentulus suthepicus Nakamura & Likhitrakarn

Nakamura, Osami & Likhitrakarn, Natdainai, 2009, Protura (Hexapoda) from Doi Suthep-Pui National Park, Chiang Mai, Thailand, Zootaxa 2121, pp. 1-16 : 8-11

Kenyentulus suthepicus Nakamura & Likhitrakarn sp. nov.

Figures 4–5 , Table 2 .

Type material examined. Holotype Ƥ, 6 paratype Ƥ, mixed forest. The holotype (CMUZ-1389) and 3 paratypes (CMUZ- 1390–1392) are deposited in the collection of the Chulalongkorn University Museum of Zoology, Bangkok, and 3 paratypes ( NSMT –Ap 442–444) are in the collection of the National Science Museum, Tokyo.

Description. Body length 686 (640–740) μm. Head 124 (123–127) μm long, 84 (78–97) μm wide. Rostrum not protruding; additional setae and anteropseudocular setae absent; postpseudocular setae (pp) present; lateral setae (ls) short, pointed ( Fig. 4 A). On maxillary palpus, dorsal (d) and ventral sensilla (v) same shape and length (about 3 μm) ( Fig. 4 B). Labial palpus with 3 setae and one sensillum ( Fig. 4 C). Pseudoculus ( Fig. 4 D) (6–) 7 μm long, 6 (–7) μm wide, PR = 18.9 (–21.2). Canal of maxillary gland relatively long with two additional dilatations on proximal part ( Fig. 4 E).

Dorsal Ve n tr a l Foretarsus length ( Figs. 4 F–H) 51 (–55) μm; claw 17 (–18) μm, TR = (3.0–) 3.2; empodium 3 μm, EU = (0.15–) 0.2; seta s longer than claw. Sensilla a, c, d, e, f, g, a', b' and c' thick; t1 claviform, BS = (0.42–) 0.48; t2 thin; t3 short, thick; a long, surpassing base of γ3; b thin, short, not reaching γ3; c long, its apex surpassing base of f; d surpassing base of f; e close to f; f slightly longer than e; g reaching base of claw; a' almost at same level with t1; b' slightly anterior to t2, its apex reaching base of c'; c' reaching base of claw. Ventral seta β1 short (about 6 μm), sensillum-like, δ4 (about 9 μm) longer than other δ setae (6–7 μm). Pores present between a and α3 and between t3 and g. Length of middle tarsus (22–) 24 μm, its claw (13–) 14 μm; hind tarsus 25 (–27) μm, its claw (13–) 14 μm.

Chaetotaxy as in Fig. 5 and Table 2 . P1a and P2a on thoracic tergites II–III extremely short, about 2 μm; P5 on II minute; that on III rudimentary. Abdominal tergites I–IV with three pairs of anterior setae; V–VI with two pairs; VII with three pairs; sternite VIII without posterior setae. On tergites II–VI, P3 situated a little anterior to other principal setae. Seta A5 and other accessory setae on abdominal tergites I–VI sensillum-like, length 3 μm; accessory setae on VII also sensillum-like, but slightly longer than those of preceding tergites, length 5 μm. Lengths of setae P1 and P1a on thoracic tergite II 9 μm and 2 μm; P1 and P1 a on abdominal tergite VI 14 μm and 3 μm; those on VII 15 μm and 5 μm, respectively.

Thoracic tergite II with al and sl pores, III with sl pores. Abdominal tergite I-VIII with psm pore, II-IV with al pores, pores psl present on tergite VII only, pore ag on V–VII ( Figs. 5 C, D). Sternites V–VI with pore posterior to A2; VII with pore anterior to P1a ( Fig. 5 E). Telson with a dorsal central pore and a pair of ventral pores at anterior edge.

Abdominal appendages II–III each with two setae; subapical seta 11 (–13) μm long, median apical seta 4 μm long ( Fig. 4 I). Striate band reduced, anterior line serrate, minute striae visible only along proximal margin ( Fig. 4 J); comb consisting of about eight small teeth ( Fig. 4 K). Female squama genitalis with sharply pointed acrostyli ( Fig. 4 L). Male unknown.

Diagnosis. The genus Kenyentulus consists of 39 species and is distributed in Southwest and East Asia. This new species is similar to K. malaysiensis (Imadaté) from Malaya, Borneo and Viet-Nam ( Imadaté, 1965) in having foretarsal sensillum b' at almost same level as t2 and abdominal tergite V–VI with two pairs of anterior setae (A2, A5). In K. suthepicus , foretarsal sensillum a is thick and fairly surpasses the base of t2, sensillum b is thin, and sensillum e surpasses the base of g, whereas in K. malaysiensis a is thin and does not reach the base of t2, b is thick, and e does not reach the base of g. Kenyentulus suthepicus is also similar to K. serdinensis Chao & Chen from Taiwan ( Chao et al., 1998), but differs in lacking hairy papillae on the maxillary gland (numerous hairy papillae in K. serdinensis ) and having 4 anterior setae on tergite V (6 in K. serdinensis ). On the foretarsus of K. suthepicus , sensillum c does not reach the apex of sensillum d, sensillum e surpasses the base of α7, and sensillum f reaches the base of claw, whereas in K. serdinensis c fairly surpasses the apex of d, e does not reach the base of α7 and f does not reach the base of δ5.

Chaetotaxic variations observed included the asymmetric absence of A1 on abdominal tergite IV, asymmetric presence of A1 on tergite V, and absence of A c in sternite VII on one female; asymmetric absence of M on thoracic sternite I and A4 on thoracic sternite II on one female; and asymmetric absence of A1 on abdominal sternite II and doubled Ac on abdominal sternite III on one female.

Etymology. The specific name is derived from the name of the type locality.

Figures

FIGURE 4. Kenyentulus suthepicus sp. nov., holotype, female. A, Head, dorsal view; B, maxillary palpus; C, labial palpus; D, pseudoculus; E, canal of maxillary gland; F, interior view of foretarsus; G, exterior view of foretarsus; H, interolateral view of foretarsus; I, abdominal appendage III; J, striate band on abdominal segment VIII; K, comb on abdominal tergite VIII; L, female squama genitalis. Arrows indicate pores. Scale bar: 20 μm for A; 10 μm for B – L.

FIGURE 5. Kenyentulus suthepicus sp. nov., holotype, female. A, Thoracic tergite II, left half; B, abdominal tergites I – II, left half; C, abdominal tergite VI, left half; D, abdominal tergites VII – VIII, left half; E, abdominal sternites VI-VII. Arrows indicate pores. Scale bar: 20 μm.

Tables

TABLE 2. Chaetotaxy of Kenyentulus suthepicus sp. nov.

	Formula	Composition of setae	Formula	Composition of setae
Thorax I	4	1, 2	4–2 6	A1, 2, M P1, 2, 3
II–III	6 16	A2, 4, M P1, 1a, 2, 2a, 3, 4, 4a, 5	7–2 4	Ac, 2, 3, 4, M P1, 2
Abdomen I	6 12	A1, 2, 5 P1, 1a, 2, 2a, 3, 5	3 4	Ac, 2 P1, 2
II–III	6 16	A1, 2, 5 P1, 1a, 2, 2a, 3, 4, 4a, 5	3 5	Ac, 2 Pc, 2, 3
IV	6 16	A1, 2, 5 P1, 1a, 2, 2a, 3, 4, 4a, 5	3 8	Ac, 2 P1, 1a, 2, 3
V–VI	4 16	A2, 5 P1, 1a, 2, 2a, 3, 4, 4a, 5	3 8	Ac, 2 P1, 1a, 2, 3
VII	6 18	A2, 4, 5 P1, 1a, 2, 2a, 3, 3a, 4, 4a, 5	3 8	Ac, 2 P1, 1a, 2, 3
VIII	6–7 8	A1, 4, 5, Mc, 2, 3, 4 P2, 3, 4, 5	4 0	1, 2
IX	14	1, 2, 3, 3a, 4, 4a, 5	4	1, 2
X	12	1, 2, 3, 3a, 4, 5	4	1, 2
XI	6	1, 2, 3	6	1, 2, 3
Telson	9	c, 1, 2, 3, 4	6	1, 2, 3