Plutomurus weinerae Barjadze, Kováč & Parimuchová, 2024

Barjadze, Shalva, Mayvan, Mahmood Mehrafrooz, Parimuchová, Andrea, Maghradze, Eter & Kováč, Ľubomír, 2024, Two new species of Plutomurus Yosii (Collembola: Tomoceridae) from Georgia and Iran, Zootaxa 5463 (4), pp. 559-572 : 561-566

publication ID	https://doi.org/ 10.11646/zootaxa.5463.4.6
publication LSID	lsid:zoobank.org:pub:31C63850-1899-4C2A-9BE7-950B9F9ED88D
DOI	https://doi.org/10.5281/zenodo.11612745
persistent identifier	https://treatment.plazi.org/id/DB28A21D-9214-FF8E-FF18-FBD2FC9FFEE8
treatment provided by	Plazi
scientific name	Plutomurus weinerae Barjadze, Kováč & Parimuchová
status	sp. nov.

Treatment

Plutomurus weinerae Barjadze, Kováč & Parimuchová sp. nov.

( Figs 4 View FIGURES 4–5 , 6–17 View FIGURES 6–13 View FIGURES 14–16 View FIGURE 17 )

Type locality. GEORGIA, Racha-Lechkhumi and Kvemo Svaneti region, Oni municipality, close to the village Usholta, Racha karst massif, Usholta Cave , 1796 m a.s.l.

Type material. Holotype: Female on slide, twilight zone of the main horizontal passage, about 60 m from the cave entrance, hand collecting, 23.vi.2023, leg. Ľ. Kováč, code GEOUSH20230623-05 ( IZISU) ; Paratypes: 4 specimens on separate slides with the same data as holotype : 1 specimen on slide with code GEOUSH20230623-01 ( IZISU) ; 3 specimens on separate slides with code UPJŠ-107-23-2-4 ( UPJŠ) .

Description. Body length 2.20–2.70 mm ( Fig. 4 View FIGURES 4–5 ).

Scale distribution. Scales are present dorsally on Ant. I–II, head, Th. and Abd., all leg segments, both sides of ventral tube and ventral side of furca.

Head. Ratio of antennal length: head length as 2.13–2.84. Ant. III–IV annulated without scales. Eye patch with 6 well developed eyes ( Fig. 14 View FIGURES 14–16 ). Head dorsally with 1 unpaired (A 0), and 7 paired Mc: 2 anterior (A 2, A 3), 2 interocular (S 2, S 4) and 3 postocular (Pa 3, Pa 4, Pa 5) distributed as in Fig. 14 View FIGURES 14–16 . Posterior margin of head with a row of equal mesochaetae. Prelabral and labral chaetae smooth: prelabral chaetae 4 (2+2) ( Fig. 6 View FIGURES 6–13 ); labrum with 554 papillate chaetae as typical for genus.

Body chaetotaxy. Dorsal bothriotrichal formula as 2,1/0,0,1,2,0 ( Figs 15–16 View FIGURES 14–16 ). Dorsal Mc formula 5,2/3,3,4,6,3– 4 ( Figs 15–17 View FIGURES 14–16 View FIGURE 17 ). Thoracic macrochaetotaxy as in Fig. 15 View FIGURES 14–16 . Th. II with 3 anterior (m 3, m 4, m 5) and 2 posterior (p 3, p 5) Mc; Th. III with 2 posterior (p 3, p 4) Mc. Abdominal macrochaetotaxy as in Figs 16–17 View FIGURES 14–16 View FIGURE 17 : Abd. I–II each with 3 posterior (m 2, m 3, m 4) long Mc respectively; Abd. III with 4 long Mc: 2 anterior (m 2, m 6) and 2 posterior (p 1, p 6) and one short Mc (p 7) as typical for genus; Abd. IV with 6 posterior Mc: 2 long (C 6, E 3) and 3 short Mc (A 6, B 6, D 3, T 7) ( Fig. 17 View FIGURE 17 ); Abd. V with 3–4 posterior (p 2, p 3, p 4 or p 2, p 3, p 4, p 5) long Mc ( Fig. 16 View FIGURES 14–16 ). Macrochaetal and socket proportions see in Table1 View TABLE 1 .

Legs. Hind legs with well–developed trochanteral (10–18 chaetae) and femoral (14–21 chaetae) organs ( Fig. 9 View FIGURES 6–13 ), with several elongated chaetae; posterior side of tibiotarsus III with 2 outstanding inner, apical and basal spine–like chaetae (arrows in Fig. 12 View FIGURES 6–13 ) with tibiotarsal spine formula as 002. Apical spine–like chaeta on tibiotarsus III is always shorter and wider than basal spine–like chaeta. Ratio of apical spine–like chaeta: basal spine–like chaeta as 0.55–0.58. Tenent hair clavate ( Fig. 10A View FIGURES 6–13 ). Ratio of claw III: Empodium III: tenent hair III as 1.39–1.96: 0.83–1.22: 1. Inner edge of claw on all legs with one characteristically minute proximal unpaired tooth (as a in Fig. 10 View FIGURES 6–13 ) and 1–3 distal unpaired teeth, 2–4 in total (as b and c in Fig. 10 View FIGURES 6–13 ). Claw with long pseudonychia ( Fig. 10 View FIGURES 6–13 ). Ratio of pseudonychium III: claw III length internally as 0.42–0.59: 1. Empodium lanceolate, tapered, with 2 internal lamellae bearing 0–5 teeth ( Fig. 10A, B View FIGURES 6–13 ).

Ventral tube. It has numerous smooth chaetae: 8–18 anterior, 18–41 posterior and 24–38 lateral, respectively ( Fig. 8 View FIGURES 6–13 ).

Tenaculum. Rami with 4 + 4 teeth, corpus with 1 smooth chaeta ( Fig. 7 View FIGURES 6–13 ).

Furca. Ratio manubrium: dens: mucro as 4.49–5.43: 6.63–8.14: 1. Basal segment of dens with 3–4 apically acuminate macrochaetae on outer margin ( Fig. 13 View FIGURES 6–13 ). Inner edge of dens with well differentiated spines: spines on basal segment of dens forming 2 short and poorly organized longitudinal rows with 1 or 2 large spines apically ( Fig. 13 View FIGURES 6–13 ). Spines on apical segment of dens forming a single row extending maximum 1 / 3 or 1 / 2 of segment length. Proximal edge of apical segment of dens always starts with small spines, while terminal spine is always largest long spine in a single row ( Fig. 13 View FIGURES 6–13 ). Dental formula is variable as 5–7 I–II / 2–7 I(II) 0–3 0–I(II) 0–2 0–I (Arabic numbers represent small spines; Roman numerals in bold and Italics represent large spines, on basal/apical segments of dens). Mucro with 2 basal, 0 intermediate and 2 distal teeth (202 formula) ( Fig. 11 View FIGURES 6–13 ). Measurements of selected morphological characters are given in Table 1 View TABLE 1 .

Variation. Variable characters are given in Table 2 View TABLE 2 .

Discussion. The new species is morphologically most similar to Central European Plutomurus ruseki Barjadze, Kováč & Parimuchová, 2022 and Iranian P. danialensis sp. nov. by the combination of the following characters: (1) the number of prelabral chaetae (2+2); (2) the shape of tenent hair (clavate); (3) the formula of tibiotarsal inner spine-like chaetae (002), (4) the number of eyes (6); and (5) the number of Mc on Th. II (5) ( Barjadze et al. 2022 and present study).

The new species can be easily distinguished from Plutomurus ruseki by (1) the presence of three postocular Mc on head compared to two Mc in P. ruseki ; and (2) six Mc on Abd. IV (E 3, T 7, D 3, C 6, B 6, A 6) compared to only three Mc (E 3, T 7, C 6) in P. ruseki ( Barjadze et al. 2022 and present study). Plutomurus ruseki inhabits soil and cave habitats in Slovakia (central Europe), while the new species is only known from the cave in Georgia (Caucasus).

The new species can be distinguished from Plutomurus danialensis sp. nov. by two main characters: firstly, the antennae of P. weinerae sp. nov. are shorter, with an antenna: head ratio of 2.13–2.84, compared to 3.35–4.81 in P. danialensis ; secondly, P. weinerae has six Mc (E 3, T 7, D 3, C 6, B 6, A 6) on Abd. IV, whereas P. danialensis has only five Mc (E 3, T 7, D 3, C 6, A 6) (our personal observation). Additionally, the type localities of the two new species are approximately 1000 km apart (see Fig. 1 View FIGURE 1 ).

Etymology. The species is named in the honour of Prof. Wanda Maria Weiner (Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Kraków, Poland), an outstanding Collembola taxonomist.

Ecology. It is a troglophilous species with pigmented body and well developed 6+6 eyes, occupying twilight zone of the cave.

Distribution. For now, the species is known only from the single cave. This cave is distinctly isolated from other caves of Racha karst massif ( Tatashidze et al. 2009) inhabited by Plutomurus birsteini Djanashvili & Barjadze, 2011 known from Nikortsminda Melia, Sakishore (type locality), Shareula II, and Tsakhi (=Gogolati) caves in Ambrolauri municipality ( Djanashvili & Barjadze 2011).