Fjellbergella lazovskiensis, Bu, Yun, Potapov, Mikhail B. & Yin, Wen Ying, 2014

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 : 23-26

Taxon classification Animalia Protura Acerentomidae

Fjellbergella lazovskiensis sp. n. Figs 4, 5; Table 2

Material examined.

Holotype, female (No. FE-2011051-2) (SEM), Russia, Far East, Primorsky Krai, Lazovsky area, nearby Preobrazheniye, from the mixed samples of humus (full of white mycelium) and a little soil under a broad-leaved forest close to the seashore, 42°54.16'N, 133°53.33'E, 22-IX-2011. coll. Y. Bu, C. W. Huang, M. Potapov & V. Alpatov. Paratypes, 5 females (Nos. FE-2011046-2, FE-2011052-4, FE-2011052-5, FE-2011052-6, FE-2011073-1) (SEM), 5 males (Nos. FE-2011071-1, FE-2011072-1, FE-2011074-1, FE-2011075-1, FE-211075-3) (SEM; MSPU), same data as holotype. Other materials, 3 male preimagos (Nos. FE-2011048-2, FE-2011048-3, FE-2011049-3) (SEM), same date as holotype.

Description.

Adult body length 1100-1300 µm (n=10), pale yellow in color (Fig. 5A).

Head (Fig. 4A). Ovate, length 120-125 µm, width 85 µm. Setae d6 present, sd4 and sd5 short sensilliform. Setae d6 and d7 subequal in length. Seta sd7 18 µm in length. Clypeal pore cp and frontal pore fp present. Pseudoculus round, length 9-10 µm, with short posterior extension, some irregular lines visible under light microscope, PR=12-13 (Fig. 4B). Calyx of maxillary gland smooth, with one helmet-like dorsal appendix, blind end split into two leaves, and posterior filament 15 µm, CF=8 (Fig. 4C). Maxillary palpus with two tapering sensilla, dorsal one (8-10 µm) slightly longer than lateral one (7-9 µm) (Fig. 4D). Labial palpus reduced, with two-branched terminal tuft of setae, with one leaf-shape basal sensillum (Figs 4E, 5B).

Foretarsus (Fig. 4H, I). Length 90-95 µm, claw length 20-21 µm, without inner flap, TR=4.3-4.7; empodium length 4 µm, EU=0.2. Dorsal sensilla t-1 claviform, t-2 slender and long (25-26 µm), BS=0.38-0.42, t-3 short and lanceolate. All other exterior sensilla slender, with except a slightly broad, surpassing base of c, b shorter than c and located in subequal level, d lower than c, e slender, f long, g short. Interior sensilla a’ short and broad, b’ slender and surpassing base of δ 5, c’ reaching base of claw. Relative length of sensilla: t3 <t1< a’ <b <(a = g = d = b’ = c’) <(c = e = f = t2). Setae β 1 and δ 4 sensillum, 7 µm and 5 µm respectively. Pores close to base of sensilla a and t3 present. Length of middle tarsus 40-45 µm, claw length 18-20 µm. Length of hind tarsus 45-50 µm, claw length 20-23 µm.

Thorax. Thoracic chaetotaxy given in Table 2. Setae 1 and 2 on pronotum 20 µm and 15 µm length respectively, mesonotum and metanotum with eight pairs of P-setae, accessory setae short sensilliform, 2.5 µm; setae P1, P1a and P2 on mesonotum 18-20 µm, 2.5 µm and 22-25 µm respectively (Fig. 4J). Prosternum with two pairs of anterior seta, and setae A2 and M2 sensilliform (Fig. 5C). Mesosternum and metasternum each with 7 A-setae, and setae A2 and A4 sensilliform (Fig. 5D, E). Pronotum and prosternum without pores (Figs 4J, 5C). Mesonotum with pores sl and al, metanotum with pores sl only (Fig. 4J). Mesosternum and metasternum each with single median pore, situated anterioral to level of setae M (Fig. 5D, E).

Abdomen. Abdominal chaetotaxy given in Table 2. Tergite I with three pairs of anterior setae (A1, A2, A5) and six pairs of posterior setae. Tergites II–VI with eight pairs of posterior setae. Tergite VI and VII with four pairs of anterior setae (A1, A2, A4, A5). Tergite VII with nine pairs of posterior setae, P3a present. All accessory setae on tergites I–VII short sensilliform, 3 µm on tergites I–VI and 6 µm on VII. Tergite VIII with paired setae M1 (Fig. 5F). Sternites IV–VII each with eight posterior setae, Pc absent (Fig. 5K, L, M). Sternite VIII with two rows of setae (4/2) (Fig. 5G).

Tergites I and VIII with pores psm only, II–VII with pores psm and al, IX–XI without pores, XII with single medial pore (Fig. 5F). Sternites I–III without pores (Fig. 5 H–J), IV with 1+1 anteromembranal pores (Fig. 5K, N), V and VI each with 1+1 posterior pores close to seta P1 and 2+2 anteromembranal pores (Fig. 5L, O, P), VII with single posterior pore asymmetrical located left or right (Fig. 5M), VIII–XI without pores, XII with 1+1 pores al.

Abdominal appendages I, II, III with 2, 1, 1 segments and 4, 3, 3 setae respectively. On appendages II and III, subapical seta 19-21 µm, two apical setae 11-12 µm, and 5-7 µm in length (Fig. 5 I–J). Striate band on abdominal segment VIII reduced, anterior margin with sparse irregular teeth (Figs 4K, 5F, G). Comb on abdomen VIII rectangular, with 12 teeth (Fig. 4L). Female squama genitalis with short subuliform acrostyli (Fig. 4F). Male squama genitalis with 5+5 setae on dorsal side and 3+3 setae on ventral side (Fig. 4G).

Chaetal variability. Chaetal variations were observed in 4 specimens: on tergite VI, asymmetrical absence of A4 of right side (No. FE-2011071-1); on tergite VII, asymmetrical absence of P1 of right side (No. FE-2011052-4); on sternite VII, absence of Ac (No. FE-2011075-1), and asymmetrical absence of A2 of left side (No. FE-2011052-6).

Etymology.

The species is named after Lazovsky Nature Reserve where the type specimens were collected.

Distribution.

Known only from type locality.

Diagnosis.

Fjellbergella lazovskiensis sp. n. is characterized by three pairs of anterior setae on tergites II-V which is different to any other members of the genus, four pair of anterior setae, nine pairs of posterior setae on tergite VII, foretarsal sensilla b, c and d located in subequal level, b shorter than c, and tergite IX and X with 14, 12 setae respectively.

Remarks.

The present species is located in the genus Fjellbergella because three setae on abdominal legs, labial palpus with two-branched terminal tuft of setae, claviform sensillum t1 on foretarsus, reduced striate band, two pairs of anterior setae on mesonotum and metanotum, and 4/2 setae on sternite VIII. Fjellbergella lazovskiensis sp. n. is similar to Fjellbergella tuxeni Nosek, 1980 from Alaska in having 8 A-setae on tergite VII and presence of P1a on tergite I–VII. They can be distinguished by the chaetotaxy of tergite IX and X (14 and 12 setae in Fjellbergella lazovskiensis sp. n. respectively vs. 12 and 8 setae in Fjellbergella tuxeni ), length and location of foretarsal sensilla b and c (b shorter than c and they located at the same level in Fjellbergella lazovskiensis sp. n. vs. b and c subequal in length and c located lower than b distinctly in Fjellbergella tuxeni ), shape and length of sensillum a’ (broad and reaching base of sensillum b’ in Fjellbergella lazovskiensis sp. n. vs. slender and far surpassing base of sensillum b’ in Fjellbergella tuxeni ), and shape of claw of foreleg (absence of inner flap in Fjellbergella lazovskiensis sp. n. vs. presence in Fjellbergella tuxeni ). In addition, the new species has only 6 anterior setae on tergites II-V contrary to two other members of this genus, which have 8 anterior setae.