Lebertia (Pilolebertia) vigintimaculata Thor 1900

• Main Authors: Tyukosova, Valentina, Gerecke, Reinhard, Stur, Elisabeth, Ekrem, Torbjørn
• Format: Other/Unknown Material
• Language: unknown
• Published: 2022
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Trombidiformes; Lebertiidae; Lebertia; Lebertia vigintimaculata; Norway; Paa; Hammerfest
• Online Access: https://zenodo.org/record/7506363; https://doi.org/10.5281/zenodo.7506363

Lebertia (Pilolebertia) vigintimaculata Thor, 1900 Lebertia (Pilolebertia) 20maculata Thor, 1900: 272, pl. 10 figs 1–2. Nomen dubium, probably identical with L. obscura Thor, 1900. Type series Missing. Type locality: Norway, “Storvandetz (Hammerfest); Hannesvand (Senjen)”; no date, no information on number of specimens, at least one female. Material examined NORWAY • 1 ♀, 1 dn; “ 10-7-1897 Dam i Bergselv paa Hindö. Sig Thor Lebertia 20-maculata Sig Thor + NB nymfe”; slide mounted; NHMO • 4 ♂♂, 11 ♀♀; “6-7-97 Svartelv [??] Sollivand naer Bodö. Sig Thor Lebertia 20maculata Sig Thor”; of these, 2 ♂♂ and 2 ♀♀ slide mounted; NHMO • 1 ♀; “ Lebertia vigintimaculata, ♀, Hamersdengen (?) Dr. Sig Thor ges. 3.7.1897 ”; slide mounted; MNHB 1762 (see Gerecke 2009) • 1 ♀; “ K. Viets 45262; Lebertia vigintimaculata Thor / Cotype. Norwegen. Svartelv ved Bodö. 6.7.1897 S. Thor leg. 2000”; slide mounted; SMF. Remarks Characters considered as species-diagnostic in the original description concern exclusively body colouration (Thor 1900). It was described as dark brown “with a narrow, dark dorsal line” (in Thor 1900: fig. 1, a Y-shaped line is visible; such a line, representing the excretory organ, is typically whitish in species of Lebertia). Furthermore, Thor observed dorsally a pattern of ca 20 darker dots (“strongly resembling L. oudemansi, but the latter with 12 such dots only”). The description includes the following additional details: idiosoma L/W 1500/1300–1400; integument rather thick and punctate. Shape of coxal and genital fields “as in L. insignis and L. porosa ”; palps and legs very strong (palps as thick as I-L); III- and IV-L-5/6 each with 6–12 long swimming setae “in a bundle”. His two figures (Thor 1900: pl. 10 figs 1–2) show a dorsal view of a specimen of uncertain sex and the partial venter of a female. From his fig. 2, a mL ratio Cx-I/II of about 2.0 can be calculated. The arrangement of the name-giving twenty dots in Thor’s fig. 1 makes it clear that they represent glandular sacs which are present in all water ...