Persiatelurina daghestaniana Kaplin, 2019

Kaplin, V. G. & Vasin, V. G., 2019, A new species of silverfish of the genus Persiatelurina Molero et al. (Zygentoma: Nicoletiidae) from Daghestan, Zoosystematica Rossica (Zoosyst. Rossica) 28 (1), pp. 88-93 : 89-93

Persiatelurina daghestaniana Kaplin , sp.nov.

( Figs 1–17 )

Holotype. Female (in slides), Russia, Daghestan, environs of Derbent fortress, 42°03'10''N, 48°16'26''E, 22.IV.2018, V. Kaplin, V. Vasin ( VIZR).

Paratypes. Two females (in slides), same data as for holotype ( VIZR) .

Description. Body length 3.2–3.8 mm; head length 0.26–0.28 mm; thorax length 1.1–1.2 mm. Head width 0.8–0.9 mm; thorax width 1.3– 1.4 mm; width of abdominal segment IX about 0.5 mm.

General colouration yellowish white with golden chaetae and scales. Body small, elongate (2.2– 2.6 times as long as wide), ateluriform in shape, covered (including head and coxae) by relatively large scales which 1–2.1 times as long as wide and with 14–20 rays (antennae and cerci partially broken). Macrochaetae simple or with apical bifurcations.

Head small, 1.5 times as wide as long ( Fig. 1 ). Basal annuli of flagellum with trichobothria. Mandibles with row of macrochaetae along outer surface (last of these macrochaetae with apical bifurcation) as well as with well-developed incisor and molar regions. Incisor region with seven incisives. Maxillary palps with five palpomeres. Ultimate palpomere of maxillary palps 1.2 times as long as penultimate one; ultimate palpomere with four apical sensorial papillae of usual form ( Fig.3 ). Galea of maxilla with two apical conules: one more rounded than other. Apical tooth of lacinia bifid; pectinate prostheca long with about 20–22 narrow hyaline projections, five bifurcated hyaline lamellae (first of these lamellae large and perpendicular, rest lamellae inclined), about five simple macrochaetae and three small chaetae along inner margin. Perpendicular lamella in apical part with five lateral projections ( Fig. 4 ). Apical palpomere of labial palp ovoid, about 1.3–1.5 times as long as wide, with six typical sensorial papillae ( Fig. 2 ). Undersurface of last three palpomeres of labial palps with numerous relatively shortened and thickened, slightly curved and apically bifurcated chaetae. Glossae divided into two pairs of lobes, shorter than paraglossae. Paraglossae with simple and bifid chaetae.

Lateral margins of thoracic tergites with a row of setae, two of which (located in posterolateral angles of tergites) apically bifid and longest ( Fig. 9 ). Anterior border of pronotum with numerous small chaetae. Posterior margin of pro-, meso- and metanotum with eight to ten small chaetae ( Fig. 9 ). Legs quite elongate. Coxae and femora widened ( Fig. 5 ). Ratio of lengths: for I, II and III coxae about 2.0, 1.6 and 1.4, respectively; for femora, 1.7, 1.6 and 1.5; for tibiae, 3.7, 4.2 and 4.5. All tibiae with two lyriform spines located at apex of dorsal part, but all femora with only one such spine ( Fig. 6 ). Tibia also with one relatively large apical spur and four ventral simple macrochaetae. Middle part of all femora with two long macrochaetae on poorly marked ledge: distal one bifid, proximal one simple. Praetarsus with two strong claws, two small pulvilli, medial empodial claw and slightly convex small support oval platform with 3–4 transverse ribs ( Fig. 7 ).

Urotergites I–VIII infralaterally with 2+2 bifid and 2+2 additional simple macrochaetae: inner chaetae more robust and longer than other ones. Posterior margin of urotergites I–VIII with four small chaetae ( Fig. 10 ). Urotergite IX with posterolateral corners protruding, with 1+1 apical, 5+5 outer and 1+1 inner macrochaetae; outer and inner macrochaetae shorter than apical ones ( Fig. 11 ). Urotergite X with semicircular concave hind margin; ratio of width to depth of this notch (concavity) about 2.2; apex of posterolateral angles of urotergite X with 1+1 long and strong macrochaetae; inner and outer margins of this notch with three macrochaetae each ( Fig. 8 ).

Urosternite I with 1+1 submedian small chaetae. Urosternite II with one pair of submedian vesicles and with six setae ( Fig. 12 ). Urosternite III with four macrochaetae and two small chaetae ( Fig. 13 ). Urosternites IV–VI with five or six chaetae on hind margin. Two submedian macrochaetae of urosternites III–VI long, apically bifurcated ( Fig. 13 ). Urosternite VII with one pair of pseudovesicles, 1+1 submedian long simple macrochaetae between pseudovesicles and 2+2 sublateral smaller setae ( Fig. 14 ). Subgenital plate well developed, 1.8 times as wide as long, with rounded hind margin and single row of simple setae, apically slightly acute ( Fig. 14 ). Urosternites VII–IX with styli; ratios of length of styli (without apical spines) on urosternite VII, urocoxite VIII and urocoxite IX to length of corresponding urosternite and urocoxites about 0.74, 0.78 and 0.84, respectively; ratios of lengths of apical spines and styli (without apical spines) for urosternite VII as well as for urocoxites VIII and IX about 0.30, 0.25 and 0.18, respectively ( Figs 14, 15 ). Ovipositor spindle-shaped, slightly shorter than styli IX. Gonapophyses VIII and IX with nine divisions and acute apices; gonapophyses VIII with numerous straight chaetae, but its outer margin also with one longer chaeta on each of 2–9th or 2–8th divisions; inner margin of gonapophysis IX with one such chaeta on each of 5–9th divisions ( Figs 16, 17 ); gonapophyses IX with an inner apical spiny area; apical part of gonapophyses IX also with well-developed oval sensorial field. Basal part of cerci with trichobothria.

Male unknown.

Remarks. The new species belongs to the genus Persiatelurina , which includes two previosly described species: P. caucasica ( Kaplin, 2016) from Abkhazia and P. farsiana Molero et al., 2018 from Southwestern Iran. The new species differs from these species by structure of the legs, maxillae, maxillary and labial palps, pronotum, urotergite X, urosternites II, VII, urocoxites VIII and IX, subgenital plate, ovipositor. The main differences between species are shown in Table.

Etymology. The name of the new species derives from the Daghestan Republic combined with the suffix “-iana”.

Habitats. All specimens of Persiatelurina daghestaniana sp. nov. were collected in mountain forest ( Quércus, Fráxinus , Rosa , other shrubs), in soil under stones, with small ants.

Figures

Figs 1–8. Persiatelurina daghestaniana sp. nov., holotype (female): 1, head; 2, labial palps with ligula; 3, maxillary palp; 4, galea and lacinia of maxilla; 5, fore leg; 6, lyriform spine; 7, fore pretarsus and third tarsomere; 8, urotergite X. Scale bar: 0.1 mm.

Figs 9–17. Persiatelurina daghestaniana sp.nov., holotype (female): 9, pronotum; 10, urotergite II; 11, urotergite IX; 12, urosternite II; 13, urosternite III; 14, urosternite VII and subgenital plate; 15, urocoxite VIII; 16, gonapophysis VIII (outer side); 17, gonapophysis IX (inner side). Scale bar: 0.1 mm.