Sugaentulus andrzeji, Shrubovych, Julia & Rusek, Josef, 2010

Shrubovych, Julia & Rusek, Josef, 2010, Sugaentulus andrzeji sp. nov. from Siberia, Russia (Protura: Acerentomidae: Acerentominae) and key to Acerentominae genera, Zootaxa 2720, pp. 59-68 : 59-64

Sugaentulus andrzeji sp. nov.

( Figs. 1–33 ; Tables 1 , 2 ).

Material examined. Holotype female (nr 19.7b) from a moss sample collected in peat in a mixed forest near Turukhansk, 65°48' N 88°00' E, Evenkia, Krasnoyarskiy Kray, Siberia, Russia, 8.VIII.2003, coll. A. Babenko. Paratypes (nr 19.1–19.16) 14 females, 15 males, 5 praeimagoes, 5 maturi juniores, 5 larvae II and 1 larva I collected in a birch forest with dense herbaceous cover, litter and soil on a river terrace near the type locality on same data as the holotype. Paratypes (nr 6580–6584, 6595–6602): 2 females, 5 males, 1 maturus junior, 2 larvae II and 3 larvae I from litter and soil sample from a mountain forest with Pinus sibirica and Abies sibirica , 500–600 m elev., on the northern bank of the lake Teletskoe Ozero, 7 km north-eastern from Artybash, 51°48'N 87°22'E, 10. IX. 1988, coll. S.K. Stebaeva and W.M. Weiner. Two female paratypes (nr 19.17), collected in a litter sample from a pine forest with bilberry ( Vaccinium myrtillus ), 15 km west of Tomsk, 56° 01'N 84° 04'E, in Timiryazyevskoye Forestry, 23.VIII. 1984, coll. N. Kuznetsova.

Other specimens examined. Four females, 5 males, 1 praeimago, 4 maturi juniores, 2 larvae II and 3 larvae I from a litter and soil sample in a birch-fir forest on bank of the river Podkamennaya Tunguska, 61°67’N 90°55’E, 57 m elev., Siberia, Russia, 1. VIII. 2006, coll. M. Shashkov.

Type deposition. Holotype (female), 14 females and 14 males, 5 praeimagoes, 5 maturi juniores, 5 larvae II and 1 larva I (slides 19.3–19.7 and 19.11–19.16) and other materials are deposited in the collection of the SMNH. Three female and 7 male paratypes (slides 19.8–19.10) deposited in collection of M. Potapov, Moscow, Russia. Two female, 5 male, 1 maturus junior, 2 larva II and 3 larva I paratypes (slides 6580–6584, 6595–6602 deposited in collection of ISEA. One female and one male paratype (slides 19.1, 19.2) deposited in J. Rusek ’ s collection. All specimens are mounted in microscopic slides in Faure medium ( Dunger & Fiedler 1989).

Description. Measurements of all stages given in Table 1 . Dorsal side of head with moderately long setae, without modified setae, additional and postpseudocular setae present ( Fig. 1 ). Labrum slightly protruded ( Fig. 2 ). Pseudoculus circular, with distinct but short posterior extension, PR 15–20 ( Fig. 3 ). Maxillary gland with slight, weakly visible calyx and without racemose appendices on the surface. Posterior filament short, with small bilobed posterior dilation, CF 6.0–8.8 ( Fig. 4 ). Maxillary palps short, dorsal and lateral sensilla equal in length, leaf-like ( Figs 5, 6 ). Labial palps well developed, with finger-like basal sensillum ( Fig. 7 ). Labium with smooth inner margin. Posterior margin of head with central seta 1 slightly shorter than lateral seta 2, lateral seta 3 half the length of seta 2 ( Table 1 , Fig. 1 ).

Setae on nota differing only slightly in length ( Figs. 10, 11 ). Setae on pronotum of nearly equal length. Meso- and metanotum with 2+2 anterior setae (A2, A4). Seta M on meso- and metanotum short, half the length of seta P1. Accessory setae P1a, P2a and P3a long, setiform; P5 minute, sensilliform. Length ratio of P1: P1a: P2 on mesonotum as 1.3–1.5: 1: 2. Seta P2a on mesonotum closer to P3 than to P2, on metanotum of the same distance to both mentioned setae. Mesonotum with pores al and sl, metanotum with pores sl only. Prosternum with seta A2, meso- and metasternum without A1 setae ( Fig. 14 ). Setae A2 and M2 on prosternum, and A2 on meso- and metasternum setiform. Prosternum lacking pores; meso- and metasternum usually with two close adjacent median pores. Formula of chaetotaxy given in Table 2 .

Foretarsus lacking sensillum b’; sensillum t1 claviform; t3 leaf-like; d, f and c’ nearly setiform; remaining sensilla slender ( Figs. 8, 9 ). Sensillum d located almost centrally between sensilla c and e. Sensillum b longer than c and of the same length as sensillum a; c, e, g and a’ shorter than a and b; a’ on the level of t2 insertion. Seta β 1 unmodified, setiform, longer than δ – setae (δ 1 – δ 3), δ 4 setiform, longer than other δ–setae. Claw very long and slender, with single small inner and outer teeth. Empodial appendage short. Relative length of foretarsal sensilla: t3 <t1 <(e = a’) <(c = g) <(a = b) <(d = c’) <t2 <f. BS 0.6–0.7, TR 0.7–0.9, EU 0.1. Pores present near bases of sensilla c and t3.

Seta P3 on tergites II–VI anteriorly to line P2–P4. Accessory setae on tergites I–VII setiform, of the same length as accessory setae on nota. Seta P1a present only on tergite VII, P3a absent on tergites I–VII. Pores psm present on tergites I–VIII, psl on tergites VI–VII, al on tergites II–VII situated anteriorly between A4 and A5 ( Figs. 12, 13 ). Tergites VI–VII anteriorly with two parallel cuticular lines connected dorsally by short convergent lines. Tergites IV–V with one anterior line only.

Abdominal legs with 4, 2, 2 setae. Subapical seta of abdominal legs II and III only slightly longer than the apical seta. Pores at the bases of legs I, II and III and of abdominal legs I situated between anapleurite and catapleurite ( Figs. 19–22 ).

Accessory setae on sternites I–VII setiform. Sternites I–VII with median pore slightly anterior to setae P1 at granulated areas ( Figs. 15–18 ). Sternites VI–VII anteriorly with two parallel cuticular lines as on the tergites. Sternite V with one anterior cuticular line.

Abdominal segment VIII with distinct striate band, striae generally longitudinal but not parallel, not regularly spaced, usually shorter than band width on sternite VIII, but occasionally much longer and extending into smooth anterior cuticular area ( Figs. 23, 24 ). Abdominal tergite VIII and laterotergites with irregular row of small scattered denticles, sternite VIII with two irregular, parallel rows of denticles ( Figs. 25, 26 ). Comb VIII composed of 8–14 small teeth ( Fig. 27 ). Pore psm with several surrounding teeth, other pores absent. Posterior margin of sternite and laterotergites VIII smooth. Seta 1a on tergite IX subequal to seta 1. Seta 2a on tergites IX and X shorter than remaining setae. Posterior margin of tergite X smooth between setae 1, with distinct small teeth laterally. Hind margin of sternite XI with small, distinct teeth. Dorsal lobe of telson with median pore ( Fig. 25 ), ventral lobe with 1+1 anterolateral pores ( Fig. 26 ). Posterior margin of dorsal lobe smooth, that of ventral lobe broadly incised postero-medially, with several small teeth distal to median setae.

Dorsal Ventral

Segment Setae Formula Setae Formula Bold —primary* and secondary setae; normal—tertiary setae; italic —setae added in imago stage. Setae in parentheses asymmetrically present in maturus junior.

Male squama genitalis in adult and praeimago nearly of same length, with 7+7 setae, additional seta present ( Fig. 28 ). Female squama genitalis short, with bifurcated acrostyli ( Fig. 29 ).

Variability. Chaetotaxic variability was infrequent in the 38 adults examined. Single specimens varied as follows: prosternum with asymmetrical absence of M1, metasternum with asymmetrical absence of P2, sternite I with Pc present, sternite IV with Ac absent and Pc present, sternite V with Pc present, sternite VII with Pc present, sternite VIII with Ac present and A1 absent, asymmetrical absence of P1a, abdominal legs II with three setae asymmetrically on one side.

Etymology. The species Sugaentulus andrzeji is dedicated to our colleague and eminent zoologist, the late Prof. Dr. Andrzej Szeptycki.

Figures

FIGURES 1 – 9. Sugaentulus andrzeji sp. nov. 1 — head (pp = postpseudocular seta, a = additional seta); 2 — labrum; 3 — pseudoculus; 4 — canal of maxillary gland; 5 — maxillary palp; 6 — maxillary sensilla, dorsal view; 7 — labial palp; 8 — foretarsus, exterior view; 9 — foretarsus, interior view. Arrows show pores. Fig. 2 — paratype 19.7 c, figs. 3, 8, 9 — paratype 19.7 a, others—holotype. Scale bars: fig. 1 — 50 µm, others— 20 µm.

FIGURES 10 – 18. Sugaentulus andrzeji sp. nov. 10 — mesonotum; 11 — metanotum; 12 — tergite VI; 13 — tergite VII; 14 — metasternum; 15 — sternite I; 16 — sternite II; 17 — sternite VI; 18 — sternite VII. Arrows show pores: psm = posteromedial, psl = posterosublateral, al = anterolateral pore. Figs. 14 – 16 — paratype 19.7 c, others—holotype. Scale bars: 20 µm.

FIGURES 19 – 29. Sugaentulus andrzeji sp. nov. 19 — basal part of foretarsus; 20 — basal part of leg II (magnif. as 19); 21 — basal part of leg III (magnif. as 19); 22 — basal part of abdominal leg I (magnif. as 19); 23 – striate band, dorsal view; 24 — striate band, ventral view; 25 — tergite VIII – XII; 26 — sternite VIII – XII (magnif. as 25); 27 — comb of tergite VIII; 28 — male squama genitalis (add = additional seta); 29 — female squama genitalis. Figs. 23, 24 and 29 — paratype 19.19 a, 28 — paratype 19.7 c, others—holotype. Scale bars: 20 µm.

FIGURES 30 – 33. Sugaentulus andrzeji sp. nov., larva I—paratype 6001. 30 — foretarsus, exterior view; 31 — foretarsus, interior view; 32 — tergite VIII – XII (ls = larval setae); 33 — sternite VIII – XII. Arrows show pores. Scale bars: figs. 30 and 31 – 20 µm, figs. 32 and 33 – 50 µm.

Tables

TABLE 1. Body measurements of Sugaentulus andrzeji sp. nov. (in μm).

Measurements	Imago	Praeimago	Maturus	Larva II	Larva I
	(n = 38)	(n = 5)	(n = 6)	(n = 7)	(n = 4)
Maximum body length	1,300	960	950	900	750
Head	135–155	115–128	115–135	100–122	95–105
Pseudoculus	7–10	7–8	6–9	6–8	6
Maxillary gland	17–23	16–19	16–20	14–19	15–16.5
Posterior cephalic setae:
1	13–15	13–14	12–15	10–12	8–10
2	16–17	16–17	15–17	12–14	10–12
3	7–9	7–9	7–8	6–8	5–7
Pronotal setae:
1	17–19	15–18	14–18	12–15	10–12
2	15–17	12–15	12–15	11–12	9–11
Mesonotal setae:
M	8–12	9–10	8–9	5.5–8	7
P1	16–23	15–16	14–18	10–19	8–11
P1a	9–14	11–13	10–13	13	–
P2	19–29	19–26	21–26	15–25	13–14
Foretarsus	93–111	85–99	76–92	64–76	58–60
Foretarsal claw	30–40	30–34	27–35	21–30	20–30
Empodial appendage	2–4	2–3	2–3	2–3	2

TABLE 2. Body chaetotaxy of Sugaentulus andrzeji sp. nov.

Th. I	1*, 2*	4	A1*, 2, M1*, 2 P1*, 2*, 3	4+4 6
Th. II	A2 *, 4, M * P1*, 1a, 2*, 2a, 3*, 3a, 4*, 5*	6 16	Ac*, 2*, 3*, M P1, 3	5+2 4
Th. III	A2 *, 4, M * P1*, 1a, 2*, 2a, 3*, 3a, 4*, 5*	6 16	Ac*, 2*, 3*, 4, M P1*, 3	7+2 4
Abd. I	A1, 2, 5 P1*, 2 *, 2a, 3 *, 4 *	6 10	Ac, 2 P1*, (1a)	3 4
Abd. II-III	A1, 2, 4, 5 P1*, 2*, 2a, 3*, 4*, 4a, 5*	8 14	Ac, 2 Pc*, 1a, 3*	3 5