Imadateiella sharovi (Martynova, 1977),

Bu, Yun, Potapov, Mikhail B. & Yin, Wen Ying, 2014, Systematic and biogeographical study of Protura (Hexapoda) in Russian Far East: new data on high endemism of the group, ZooKeys 424, pp. 19-57: 31-34

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Imadateiella sharovi (Martynova, 1977)


Taxon classification Animalia Protura Nipponentomidae

Imadateiella sharovi (Martynova, 1977)  Figs 7, 8; Table 4

Acerella sharovi  Martynova, 1977: 164-166, Figs 1, 2. Syn.

Imadateiella sharovi  (Martynova, 1977), Imadaté 1981: 144.

Material examined.

7 females (Nos. FE-2011062-1, FE-2011062-4, FE-2011062-5, FE-2011085-1, FE-2011085-2, FE-2011087-1, FE-2011089-1) (SEM; MSPU), 5 males (Nos. FE-2011062-2, FE-2011062-3, FE-2011086-1, FE-2011086-2, FE-2011087-2) (SEM; MSPU), 1 male preimago (No. FE-2011090-2), Russia, Far East, Khabarovsk Krai, Vaninsky area, nearby Vysokogorny, Valley of Mulinka, from Picea  and Abies  forest on Northeast slope, sample No. 27, 750 m alt., 30-IX-2011, 1 male preimago (No. FE-2011059-2), 1 maturus junior (No. FE-2011059-1), Russia, Far East, Khabarovsk Krai, Vaninsky area, nearby Datta, from coastal larch-wood on East slope (green moss), sample No. 24, 28-IX-2011. 1 female (No. FE-2011060-1), Russia, Far East, Khabarovsk Krai, Vaninsky area, nearby Vysokogorny, Valley of Mulinka, from spruce forest at pass, sample No. 26, 900 m alt., 29-IX-2011. 2 females (FE-2011067-2, FE-2011088-1), 1male (No. FE-2011088-2), Russia, Far East, Khabarovsk Krai, Vaninsky area, nearby Vysokogorny, Valley of Mulinka, from mixed sample of spruce-forest and rotten wood, sample No. 30, 600 m alt., 29-ix-2011. 1 female (No. FE-2011069-1), Russia, Far East, Khabarovsk Krai, Vaninsky area, nearly Vysokogorny (5 km South), Valley of Dopolnitel’ny Stream, from mixed sample of litter under old poplar-trees in floodplain, sample No. 32, 400 m alt., 30-IX-2011. All specimens are collected by M. Potapov & V. Alpatov.

Description of new materials.

Adult body length 1000-1200 µm (n=16), yellow in color (Fig. 8A).

Head (Fig. 7A). Ovate, length 130-135 µm, width 80-85 µm. Setae d6 present, sd4 and sd5 short. Setae d6 14-15 µm, d7 16-17 µm and sd7 18-19 µm in length. Clypeal pore cp and frontal pore fp present. Pseudoculus round, length 7-8 µm, with short posterior extension, PR=16-17 (Fig. 7B). Maxillary gland large, calyx with lateral racemose appendices and one helmet-like dorsal appendix, and bilobed posterior dilation, posterior filament length 20-22 µm, CF=6-7 (Fig. 7C). Labial palpus reduced, with one-branched terminal tuft of setae, three setae and one leaf-shaped basal sensillum (Figs 7D, 8B), but well developed in five specimens (Figs 7E, 8C). Maxillary palpus with two tapering sensilla, subequal in length (Fig. 7F).

Foretarsus (Fig. 7H, I). Length 85-92 µm, claw length 23-29 µm, with one inner flap, TR=3.5-3.7; empodium length 4 µm, EU=0.15-0.18. Dorsal sensilla t-1 filiform, t-2 slender and long (17 µm), BS=0.33, t-3 lanceolate and short. All exterior sensilla slender, a far surpassing base of b and c, b slightly longer than c, c short and lower than b, d and e short, f long, g broad and short. Interior sensilla a’ broad and long, surpassing base of δ 5, b’ absent, c’ slender and surpassing base of claw. Relative length of sensilla: t3 < g < t1 < (c = d = e) < b < a’ < a < t2 < c’ < f. Setae β 1 and δ 4 sensilliform, 12-13 µm in length. Pores close to sensilla c and t3 present. Length of middle tarsus 40 µm, claw length 15-20 µm. Length of hind tarsus 45 µm, claw length 18-20 µm.

Thorax. Thoracic chaetotaxy given in Table 4. Setae 1 and 2 on pronotum 26-35 µm and 16-17 µm length respectively, mesonotum and metanotum with eight pairs of P-setae, accessory setae sensilliform; setae P1, P1a and P2 on mesonotum 30 µm, 10 µm and 43 µm respectively (Fig. 7J). Prosternum with two pairs of anterior seta, and setae A2 and M2 sensilliform (Fig. 8E). Mesosternum with 5 A-setae, and metasternum each with 7 A-setae, and setae A2 sensilliform (Fig. 8F, G). Pronotum and prosternum without pores (Figs 7J, 8E). Mesonotum with pores sl and al, metanotum with pores sl only (Fig. 7J). Mesosternum and metasternum each with single medial pore (Fig. 8F, G). Single membranal pore present on membrane between each coxa and the body.

Abdomen. Abdominal chaetotaxy given in Table 4. Tergite I with three pairs of anterior setae (A1, A2, A5) and six pairs of posterior setae. Tergites II–VII with eight pairs of posterior setae, P3a present. Tergite VII with four pairs of anterior setae (A2, A3, A4, A5). Tergite VII with nine pairs of posterior setae. All accessory setae on tergites I–VII sensilliform, 14-15 µm on tergites I–VI and 17 µm on VII. Tergite VIII with setae Mc). Sternite IV–V each with three anterior setae and eight posterior setae (Fig. 8K), VI–VII each with three anterior setae and nine posterior setae, Pc present (Fig. 8L, M). Sternite VIII with 4/2 setae. Hind margin of tergite IX smooth. Hind margin of tergites X–XI with very short fine ciliation. Hind margin of sternites IX–XI smooth. Posterior margin of tergite XII smooth, sternite with delicate serration in central part.

Tergites I and VIII with pores psm only, II–VII with pores psm and al, IX–XI without pores, XII with single medial pore. Sternites I and VI without pores (Fig. 8H, L), II–V each with single medial pore (Fig. 8I, J), VII with single anterior pore asymmetrical located left or right on the line (Fig. 8M), VIII–XI without pores, XII with 1+1 pores al.

Abdominal appendages I, II, III with 2, 1, 1 segments and 4, 2, 2 setae respectively. On appendages II and III, subapical seta 16-18 µm, apical seta 12-15 µm in length. Striate band on abdominal segment VIII well developed, anterior margin regular wave shaped (Fig. 8D). Comb on abdomen VIII rectangular, with 10-12 teeth (Fig. 7K). Female squama genitalis with short basal apodeme and pointed acrostyli (Fig. 7G). Male squama genitalis with 4+4 setae on dorsal side and 2+2 setae on ventral side (Fig. 7L).

Chaetal variability. Chaetal variations were observed in 7 specimens: on tergite II, absence of P4a (No. FE-2011067-2); on tergite IV, asymmetrical absence of A1 of right side (No. FE-2011060-1); on sternite II, absence of Pc and present of P1 on right side (No. FE-2011060-1, Fig. 70); on sternite III, present of Pc (No. FE-2011060-1, Fig. 71); on sternite VI, absence of Pc (Nos. FE-2011067-2, FE-2011088-2, FE-2011089-1); on sternite VIII, asymmetrical absence of P1 of left side (Nos. FE-2011062-3, FE-2011062-5, FE-2011069-1), or both side (No. FE-2011060-1).


Russia (Far East, Magadan Oblast; Khabarovsk Krai).


Imadateiella sharovi  (Martynova, 1977) is characterized by the presence of setae Pc on sternite VI and 4/2 setae on sternite VIII.


Imadateiella sharovi  (Martynova, 1977) is the first species of Protura  described in RFE. We give the redescription of Imadateiella sharovi  basing on our vast material since it shows minor differences from the redescription of Shrubovych (2014) (labial palpus, length of sensilla b, e and t2 on fortarsus and pores on sternite I). The male squama genitalis is also described for the first time. The variation on labial palpus is also uncommon - 15 specimens from samples 27 and 24 have labial palpus with reduced terminal tuft of setae (Figs 7D, 8B) while other 5 specimens from samples 26, 30 and 32 have it well developed (Figs 7E, 8C). According to the redescription of Shrubovych (2014), the type specimens have well developed labial palpus. We treat all our populations as belonging to one variable species.