Spinonychiurus persicus

Kaprus’, Igor, Shayanmehr, Masoumeh, Kahrarian, Morteza & Lafooraki, Elham Yoosefi, 2017, Three new species of Onychiuridae Lubbock, 1871 (Collembola, Poduromorpha) from Iran, Zootaxa 4291 (2), pp. 335-346 : 342-344

Spinonychiurus persicus Kaprus’, Shayanmehr & Kahrarian sp. nov.

( Figs 16–21 )

Type material. Holotype: female (mounted on slide), Iran, Osmanevand area, Dereh badam village, oak jungle, soil, 20.XII.2013, leg. M. Kahrarian . Paratypes: 2 females (mounted on slide), Iran, Kermanshah country, pine forest, leaf litter, 8.I.2014, leg. M. Kahrarian .

Etymology. Named after Persia ––historical region in Southern Iran, which is associated with the modern Iran.

Diagnosis. PAO with 19–21 granulated vesicles. Pso formula dorsally 33/233/44453, ventrally 10/000/0001. Psx formula: 01/000/222103. Labial palp of A type. Th. tergum I with 8+8 chaetae. Abd. VI tergum with one axial chaetae m0 and 1+1 prespinal chaetae. Subcoxae1 of I–III legs usually with 4, 4, 4 chaetae respectively. Tibiotarsi I–III with 11 chaetae in distal whorl. Empodial appendage without distinct lamella. AS present.

Description. Color white. Holotype length 1.3 mm, length of paratypes: 1.1–1.2 mm. Body shape cylindrical with curved anal spines, equal or larger than inner edge of claw (ratio 1–1.1) ( Fig. 16, 19 ). Granulation of body surface fine and uniform, distinctly stronger around cephalic pso. Antennal bases poorly marked by fine granulation.

Antennae distinctly shorter than head (ratio 0.85). Ms of Ant. IV located in latero-external position, in proximal whorl of chaetae ( Fig. 18 ). Ant. IV with 9–11 slightly differentiated sensilla ( Fig. 18 ). AIIIO with 5 guard chaetae, 5 papillae, 2 sensory rods, 2 smooth with only two ribs and slightly bent sensory clubs, and ms located slightly below AIIIO ( Fig 18 ). Ant. II with 16 chaetae. Ant. I with 8–9 chaetae.

PAO consisting of 19–21 granulated vesicles ( Fig. 17 ). Maxillary outer lobe with simple palp, basal chaeta and without sublobal hairs. Labral formula 4/1,4,2. Labial palp of A type (guard chaetae are difficult to observe). Labium with 6 proximal, 4 basomedian and 6 basolateral chaetae. Head ventrally with 5–6+5–6 postlabial chaetae along ventral groove.

Pso formula dorsally: 33/233/44453, ventrally: 10/000/0001. Localization of dorsal pso presented in Fig. 16 . Psx formula: 01/000/222103 (each anal valve with one psx). Localization of psx on Abd. sterna II–VI as in Fig. 19 . Subcoxae1 of I–III legs with 1 pso and 1 psx each. Femur of all legs with one psx on internal side.

Dorsal chaetotaxy as in Fig. 16 , nearly symmetrical (some asymmetries in subaxial chaetotaxy of Abd. terga IV and V), well differentiated into apically rounded macro-, mesochaetae and apically pointed microchaetae. Dorsal cephalic chaeta d0 absent.Th. tergum I with 8+8 chaetae. Th. terga II and III with lateral ms each and 3+3 axial chaetae. Body sensory chaetae s poorly marked, distributed according to formula: 1/011/222121 ( Fig. 20 ). Abd. tergum IV with one (p0) or two (m0, p0) median chaetae (sometimes asymmetries present). Abdominal tergum V with one (p0) or two (a0, p0) median chaetae (sometimes asymmetries present). Abd. VI tergum with one median chaetae m0 and 1+1 prespinal chaetae. Subcoxae1 of I–III legs usually with 4, 4, 4 chaetae respectively ( Fig. 16 ).

Th. sterna I–III with 0+0, 1+1, 1+1 chaetae respectively. VT with 8+8 chaetae and 1+1 chaetae at base. Abd. III sternum is divided on two distinct subsegments. Chaetotachy of Abd. sterna II–VI as in Fig. 19 . Furca reduced to small area of fine granulation with four small dental chaetae arranged in two rows posteriorly; only one manubrial row of chaetae posterior to dental chaetae present ( Fig. 19 ). Claws without teeth ( Fig. 21 ). Empodial appendage without basal distinct lamella, shorter than inner edge of claw (ratio 0.6–0.65). Tibiotarsi I–III with 11 chaetae in distal whorl ( Fig. 20 ). Males unknown. Anal valves with numerous acuminate chaetae: each lateral valve with a0, 2a1; unpaired anal valve with chaetae a0, 2b1, 2b2, c0, 2c1, 2c2, ( Fig. 19 ).

Remarks. The new species belongs to the group of species with 11 chaetae in distal whorl of tibiotarsi. Main differences between S. persicus sp. nov. and relatives species are summarized in Table 2. The new species is closely related to S. tianshanicus ( Martynova, 1971, see also Pomorski & Kaprus’, 2014). They differs by the dorsal pso formulas, the absence of psx on Abd. sternum V, the number of vesicles in PAO and chaetae on subcoxae 1 of II–III legs.

Figures

FIGURES 16 – 21. Spinonychiurus persicus sp. nov.: 16, habitus and dorsal chaetotaxy; 17, PAO and anterior cephalic pso; 18, dorsal side of Ant. III – IV; 19, chaetotaxy of Abd. sterna II-VI; 20, chaetotaxy and localization of pso on Abd. terga V – VI; 21, distal part of leg III with claw and empodium.