Nienna chukotka, Shrubovych, Julia, 2019
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publication ID |
https://dx.doi.org/10.3897/zookeys.899.47030 |
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publication LSID |
lsid:zoobank.org:pub:0EDFAA7D-133C-462D-BDB3-B38A228FFE57 |
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persistent identifier |
https://treatment.plazi.org/id/2FEE913F-CC4C-445A-869E-F25B7267F644 |
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taxon LSID |
lsid:zoobank.org:act:2FEE913F-CC4C-445A-869E-F25B7267F644 |
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treatment provided by |
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scientific name |
Nienna chukotka |
| status |
sp. nov. |
Nienna chukotka sp. nov. Figs 1 View Figure 1 , 2 View Figure 2 , Table 1 View Table
Material examined.
Holotype (ISEA 6650): female, Russia, Chukotka Autonomous Okrug, Chaunskiy district, 2 kilometers from Apapelgino village, hill Akanotenmeem, in dry locality with Dryas sp., elev. 20 m, 69°48'40"N, 170°35'51"E, 24-VII-2018, coll. Makarov K. and Makarova O. Paratype (ISEA 6651): female, same data as holotype. The holotype and paratype are deposited in the collection of the Institute of Systematics and Evolution of Animals, Krakow, Poland (ISEA).
Diagnosis.
Nienna chukotka is characterized by 3 pairs of A -setae on the mesonotum, metanotum and tergite VIII, 3 A -setae on sternites I–VII, absence of P1a setae on tergites I–VI, 5 pairs of A -setae on tergites II–VII, absence of A2 on prosternum, presence of seta Pc on tergite VII and sternites VI–VII, and presence of additional d6 setae on head. Foretarsal sensillum a is broadened, very long, surpassing the base of sensillum e. Posterolateral pores (pl) present on tergite I, psl pores present on tergites VI and VII, asymmetrical spsm pores present on sternites IV–VII.
Description.
Head setae l3, sd4 and sd5 long, setiform, additional seta d6 present, length ratio of posterior setae d7: sd7:l5 as 2.4:2.5:1.0; frontal pore (fp) and a pair of clypeal (cp) pores present ( Fig. 1A View Figure 1 ). Pseudoculus circular, with short posterior extension, PR = 12 ( Fig. 1B View Figure 1 ). Sensilla of maxillary palps slender, pointed apically, equal in length ( Fig. 1C View Figure 1 ). Labial palps with four-branched tuft of apical setae and broadened sensillum ( Fig. 1D View Figure 1 ). Maxillary gland with small, indistinctly granulated calyx, short posterior filament and trilobed posterior dilation ( Fig. 1E View Figure 1 ), CF = 6.0.
Foretarsus ( Fig. 1J, H View Figure 1 ) without sensillum b '; t1 filiform, t3 small and globular; a broad, very long, evidently surpassing base of seta γ 3, nearly reaching base of sensillum f; other sensilla parallel-sided. Sensillum b slightly longer than c. Sensillum d situated nearer to e than to c; a ' distal to level of t2 insertion. Length formula of sensilla: t3 <t1 <t2 <(c = e) <b <(g = a’ = c ') <(d = f) <a. Setae β 1 and δ 4 long and setiform, about twice as long as other δ -setae ( Fig. 1H View Figure 1 ). Single pores situated near bases of sensilla t1 ( Fig. 1J View Figure 1 ) and t3 (pore not visible on Fig. 1J View Figure 1 because closed by sensillum e). Claw short, without inner tooth, empodial appendage short. BS = 0.4, TR = 2.7, EU = 0.3.
Formula of chaetotaxy given in Table 1 View Table . Setae on nota differing in length ( Fig. 2A, B View Figure 2 ). Pronotal seta 1 1.6 times longer than seta 2 ( Fig. 1A View Figure 1 ). Meso- and metanota with setae P1a and P2a setiform, lengths 7 and 5 μm, respectively; P2a situated nearly midway between P2 and P3 ( Fig. 2A, B View Figure 2 ). Length ratio of mesonotal setae P1: P1a: P2 as 2.7: 1: 3.6. Meso- and metanota with sl and al pores ( Fig. 2B View Figure 2 ). Pro-, meso- and metasterna without pores ( Fig. 2E, F View Figure 2 ).
Accessory setae on tergites and sternites I–VII setiform, those of tergite VII significantly longer than those on I–VI. ( Fig. 2C, D, G, H, K, L View Figure 2 ). Pores pl present on tergite I, psm on tergites I–VII, psl on tergites VI–VII, al on tergites II–VII ( Fig. 2C, D, H View Figure 2 ).
Abdominal legs with 4, 2, 2 setae. Subapical and lateral apical setae on second and third pairs of abdominal legs nearly equal in length, 15 and 14 μm, respectively ( Fig. 2J View Figure 2 ). Sternites I–III without pores ( Fig. 2G View Figure 2 ). Sternites IV–VII with asymmetrical spsm pore, with short anterolateral lines and sternite VII with a connecting line on anterior part ( Figs 2K, L View Figure 2 ).
Abdominal segment VIII with distinct striate band; tergite and sternite anteriorly with irregular small teeth ( Figs 2 I, M View Figure 2 ). Pore psm without accompanying teeth. Posterior margin of sternite VIII and laterotergites smooth. Comb VIII with 9-10 small teeth ( Fig. 1I View Figure 1 ). Seta 1a on tergite IX half the length of seta 1. Seta 2a on tergites IX and X shorter than other setae. Sternites IX–X with traces of striate band ( Fig. 2N View Figure 2 ). Setae 1 and 2 on sternite IX of equal length, on sternite X seta 1 about half the length of seta 2 ( Fig. 2N View Figure 2 ). Medial pore on dorsal lobe of segment XII and pair of sal pores on ventral lobe. Hind margin of dorsal lobe smooth, ventral lobe with fine serrations ( Fig. 2O View Figure 2 ).
Female squama genitalis with short, pointed acrostyli ( Fig. 1F View Figure 1 ).
Body measurements (2 females) (in μm): maximum body length 1004, head 115, pseudoculus 8, lever 3, posterior part of maxillary gland 12; pronotal setae 1 18, 2 11; mesonotal setae P1 19, P1a 7, P2 25, M 10, foretarsus 94-95, claw 30, empodial appendage 4.
Chaetal variability.
In the holotype, seta P4 is doubled asymmetrically on the mesonotum; in the paratype, seta A3 is absent symmetrically on tergite I and seta P2a is doubled on tergite VII.
Etymology.
The species name is taken from the general locality where the specimens were collected.
Remarks.
Nienna chukotka sp. nov. differs from N. parvula and N. quinghaiensis in the presence of seta Pc on tergite VII and sternites VI–VII (in N. quinghaiensis seta Pc is present on sternite VII only), the presence of 5 pairs of A -setae (4 pairs in the other two species) and P3a on tergite VII, the shape of the accessory setae on tergites and sternites I–VI (setiform in the new species, sensilliform in the other two species) and the shape of foretarsal sensilla a, c and e (in the other species sensillum a is shorter, reaching base of sensillum t2, sensilla c and e short and broad). The porotaxy of meso- and metanota and abdominal sternites also differs: Nienna chukotka has two pairs of sl and al pores on the meso- and metanota, and asymmetrical spsm pores on sternites IV–VII;], whereas N. parvula has a pair of sl pores on the meso- and metanota, and a simple spm pore on sternites VI–VII. Nienna quinghaiensis has al and l pores on the mesonotum, l pores on the metanotum, and an spm pore on sternite VII. The new species is more similar to N. parvula in possessing traces of a striate band on sternites IX–X and in the globular foretarsal sensillum t3. Nienna chukotka is characterized by the presence of pl on tergite I, which is the first report of posterolateral pores in Acerentomidae . Szeptycki (1988) previously described pl pores on Hesperentomon martynovae Szeptycki, 1988 ( Hesperentomidae ) collected in the Altai Mts. These pl pores have also been recorded in other Hesperentomon species: H. fopingense Bu, Shrubovych & Yin, 2011, H. nanshanensis Bu & Yin, 2007, H. xiningense Bu & Yin, 2007 distributed in China, and H. tianshanicum Martynova, 1970 ( Shrubovych 2010).
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