Heterodispus Paoli 1911
Creators: name: Jagersbacher-Baumann, Julia
name: Ebermann, Ernst
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Prostigmata
Scutacaridae
Heterodispus

description: Genus Heterodispus Paoli, 1911
Type species Heterodispus elongatus Trägårdh, 1905, by original designation
Heterodispus foveatus Jagersbacher-Baumann and Ebermann, 2012 (Figs. 1–4)
MALE. Idiosoma length 120–150, n = 3.
Gnathosoma (Fig. 1 a) 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 setae su longer, barbed.
Dorsum (Fig. 2 a). Idiosoma with four sclerotized, finely dotted plates. Most posterior plate forms dorsal cover for genital capsule. Length of dorsal setae: v about 8, sc 1 28, sc 2 39, c 1 33, c 2 41, d 40, e 29, f 34, h 1 12. Setae v smooth, sc 1, sc 2, c 1, c 2, d, e, f barbed; sc 2, c 2 and d blunt-ended, all other setae pointed. Setae h 1 and h 2 smooth, h 2 minute. Distance between dorsal setae: v–v about 15, sc 1 –sc 1 10, sc 2 –sc 2 32, c 1 –c 1 49, c 2 –c 2 93, d–d 61, e–e 52, f–f 24, h 1 –h 1 26, h 2 –h 2 21.
Genital apparatus (Figs. 2 a, 3a). Segments H and PS fused, form genital capsule. Length of genital plate (tergite H) about 54. Posterior edge of plate narrowed, ratio length: width of genital plate = 1: 0.49. Heart-shaped area posterior of h 1 with surface with roundish-hexagonal, sucker-like structures or cavities with a diameter of about 2. Aedeagus transversely striated, internally forming a loop; continues internally as ductus ejaculatorius leading into a seminal vesicle.
Venter (Fig. 2 b). Sternal plates finely dotted. Ap1 clearly sclerotized, prosternal ap almost continuous from ap1 to sejugal ap; ap2, ap4 complete, weakly sclerotized; ap3, ap5 strongly sclerotized; ap3 incomplete; poststernal ap incomplete, between ap4 and ap5 weakly sclerotized. Length of ventral setae: 1 a about 19, 1 b 15, 2 a 16, 2 b 14, 3 a 18, 3 b 14, 3 c 19, 4 a 13, 4 b 18, 4 c 14, ps 1 2, ps 2 7. Setae ps smooth, all other setae sparsely barbed, pointed. Distance between ventral setae: 1 a –1 a about 13, 1 b –1 b 39, 2 a –2 a 26, 2 b –2 b 41, 3 a –3 a 27, 3 b –3 b 40, 3 c –3 c 76, 4 a –4 a 18, 4 b –4 b 13, 4 c –4 c 52, ps 1 –ps 1 12, ps 2 –ps 2 21.
Leg I (Fig. 4 a). Setal formula: Tr1–Fe3–Ge4–Ti6(2)–Ta13(2). Ta with one small padded claw. Sol ω 1 thick and finger-shaped, ω 2 very thin, ϕ 1 and ϕ 2 thin, baculiform. Length of solenidia: ω 1 about 17, ω 2 9, ϕ 1 7, ϕ 2 7. Eupathidia p’, p’’ and ft’’ as well as setae u’, u’’, v’’Ti and v’Tr smooth, all other setae barbed, some only sparsely. Seta k blunt, all other pointed.
Leg II (Fig. 4 b). Setal formula: Tr1–Fe3–Ge3–Ti4(1)–Ta7(1). Ta with two small claws and small empodium. Sol ω thick, finger-shaped, ϕ baculiform, ω 15, ϕ 4. Eupathidion tc’’, setae u’, u’’, v’’Ti smooth, all other setae barbed, some only sparsely; all setae pointed.
Leg III (Fig. 4 c). Setal formula: Tr1–Fe2–Ge2–Ti4(1)–Ta7. Ta with two small claws and empodium. Sol ϕ 6, thick, club-shaped. Seta u’’ smooth (?), all other seate barbed, some only sparsely; all setae pointed. Leg IV (Fig. 4 d, Table 1). Setal formula: Tr1–Fe2–Ge1–Ti4(1)–Ta6. Distal Ta with two adhesive pads of differing size. Tarsal setae tc’, tc’’ are longest, length tc’ about 91, tc’’ 63; pv’’ spine-like, smooth, all other setae barbed, pointed. Seta u minute. ϕ 12, thin.
leg IV Reference
Trochanter Femur Genu cone- or spine-like modified
setae
Scutacarus agypticus needs revision Yousef & Metawally 1973 Diversipes exhamalatus needs revision Michael 1886
Differential diagnosis. The male of Heterodispus foveatus is separated from males of all other genera by the characteristic presence of a looped aedeagus which has already been described for the congeneric H. cordidiscus (Jagersbacher-Baumann & Ebermann 2012). The male of H. foveatus can be differentiated from H. cordidiscus by longer dorsal setae sc 1, c 1, e and f, by all ventral setae being barbed and by the shape of the genital plate, which is less heart-shaped in H. foveatus than in H. cordidiscus, where it is the name-giving feature. Solenidia ω 1 and ω 2 on legs I and II are longer in H. foveatus than in H. cordidiscus, and the setation of leg IV also differs (Table 1).
Material examined. 3 males from laboratory cultures based on females from sandy ground with roots; EGYPT: Luxor, Nile riverside, 25°41’38.02’’N, 32°37’41.18’’E. 1985, leg. Ebermann.
Deposition of material. 1 male: Natural History Museum Vienna, Austria (NHMW 27.638); 1 male: Institute of Zoology, University of Graz, Austria; 1 male: Museum of Natural History of the City of Geneva, Switzerland.
description: Published as part of Jagersbacher-Baumann, Julia & Ebermann, Ernst, 2016, Support for the underrepresented sex: new descriptions of scutacarid males (Acari, Heterostigmatina), pp. 371-409 in Zootaxa 4179 (3) on pages 372-378, DOI: 10.11646/zootaxa.4179.3.3, http://zenodo.org/record/164068