Support for the underrepresented sex: new descriptions of scutacarid males (Acari, Heterostigmatina) Author Jagersbacher-Baumann, Julia Author Ebermann, Ernst text Zootaxa 2016 4179 3 371 409 journal article 10.11646/zootaxa.4179.3.3 e463720d-20fc-40bf-9d39-4f05c6288a3e 1175-5326 164068 EB3D8CAC-B3D0-4007-ABB8-F2DDDBBCF26 Genus Lamnacarus Balogh and Mahunka, 1963 Type species Lamnacarus ornatus Balogh and Mahunka, 1963 , by original designation Lamnacarus ornatus Balogh and Mahunka, 1963 ( Figs. 1 , 3 , 8 , 9 ) MALE. Idiosoma length 130–150, n = 4. Gnathosoma ( Fig. 1 c) extended, tube-shaped. One pair of finger-shaped solenidia, two pairs of dorsal setae ch 1 and ch 2 , thin, smooth, one ventral pair of ventral setae su , shorter, thinner, smooth. One pair of short tube-like accessory setigenous structures distally. FIGURE 7 . Imparipes dispar male: a. leg I, b. leg II, c. leg III, d. leg IV. FIGURE 8 . Lamnacarus ornatus male: a. dorsal view, b. ventral view. Dorsum ( Fig. 8 a). Idiosoma with four sclerotized, very finely dotted plates. Most posterior plate forms dorsal cover for genital capsule. Length of dorsal setae: v about 9, sc 1 13, sc 2 31, c 1 52, c 2 24, d 25, e 29, f 45, h 1 6. Setae v , sc 1 , sc 2 , c 1 , c 2 , d , e , f barbed, c 1 only sparsely. Seta v pointed, all other setae blunt-ended; h 1 and h 2 spine-like, h 2 small. Distance between dorsal setae: v–v about 4, sc 1 –sc 1 15, sc 2 –sc 2 22, c 1 –c 1 18, c 2 –c 2 63, d–d 57, e–e 47, f–f 17, h 1 –h 1 26, h 2 –h 2 21. FIGURE 9 . Lamnacarus ornatus male: a. leg I, b. leg II, c. leg III, d. leg IV. Genital apparatus ( Figs. 3 c, 8a). Segments H and PS fused, form genital capsule. Length of genital plate (tergite H) about 40. Posterior edge of plate narrowed, short genital plate (ratio length: width of genital plate = 1: 0.65). Small area posterior of h 1 with roundish- hexagonal, sucker-like structures or cavities. Aedeagus like in I. dispar . Venter ( Fig. 8 b). Sternal plates finely dotted. Ap1 limited to region of gnathosoma, prosternal ap continuous from ap1 to sejugal ap, strongly sclerotized; sejugal ap weakly sclerotized at central part, stronger near legII; ap2, ap5 strongly sclerotized; ap3, ap4 complete, weakly sclerotized, poststernal ap between ap3 and ap5 complete, strongly sclerotized. Length of ventral setae: 1 a about 7, 1 b 8, 2 a 9, 2 b 9, 3 a 11, 3 b 10, 3 c 9, 4 a 8, 4 b 7, 4 c 10, ps 1 2, ps 2 7. All setae smooth, short, pointed. Distance between ventral setae: 1 a –1 a about 13, 1 b –1 b 37, 2 a –2 a 17, 2 b – 2 b 39, 3 a –3 a 19, 3 b –3 b 32, 3 c –3 c 56, 4 a –4 a 19, 4 b –4 b 4, 4 c –4 c 47, ps 1 –ps 1 11, ps 2 –ps 2 13. Leg I ( Fig. 9 a). Setal formula: Tr1–Fe3–Ge4–Ti6(2)–Ta13(2). Ta with one padded claw. Sol ω1 thick and finger-shaped, sol ω2 thin, sol ϕ1 , thick, club-shaped, sol ϕ2 thin. Length of solenidia: ω1 about 24, ω2 10, ϕ1 7, ϕ2 12. Eupathidia tc’ , tc’’ and ft’’ , setae pl’’ , dTi , k , l’’Ge , dFe , v’’Fe and v’’Tr sparsely barbed, all other setae smooth; Eupathidion tc’ , setae s and pl’’ blunt, all other setae more or less pointed. Leg II ( Fig. 9 b). Setal formula: Tr1–Fe3–Ge3–Ti4(1)–Ta7(1). Ta with two claws and small empodium. Sol ω 19, thick, ϕ 8, baculiform. Eupathidion tc’’ , setae u’ , u’’ , v’Ge , l’Fe , l’’F e and v’Tr smooth, all other setae barbed, most only sparsely; all setae pointed. Leg III ( Fig. 9 c). Setal formula: Tr1–Fe2–Ge2–Ti4(1)–Ta7. Fe with a fine suture, Ta with two claws and small empodium. Sol ϕ 7, slightly club-shaped. Eupathidion tc’’ , setae u’’ , pv’’ , v’Ti , v’’Ti and l’Fe smooth, all other setae sparsely barbed; all setae pointed. Leg IV ( Fig. 9 d, Table 1 ). Setal formula: Tr1–Fe1–Ge1–Ti4(1)–Ta6. Distal Ta with two adhesive pads of differing size. Tarsal setae tc’ , tc’’ are longest, length tc’ about 38, tc’’ 22. Sol ϕ , l’Ti and dTi thick, cone-shaped, l’ < d <sol ϕ ; sol ϕ 7; dFe thick. Setae v’’Ti , u , pv’ , pv’’ and tc’’ smooth, all other setae barbed. Differential diagnosis. The males of L. ornatus can be differentiated from all other known males by the setation of its leg IV ( Table 1 ), and mostly the cone-shaped form of the sol ϕ is characteristic. The claws on legs I– III are larger and stronger than in all other known males. Material examined . 5 males from laboratory cultures based on females from a composting facility; AUSTRIA : Petzendorf , 46°55’26’’N , 15°22’18’’E ; 2010, leg. Jagersbacher-Baumann. Deposition of material . 2 males : Natural History Museum Vienna , Austria ( NHMW 27.640 ) ; 2 males : Institute of Zoology , University of Graz , Austria ; 1 male : Museum of Natural History of the City of Geneva , Switzerland .