Tanytydeus kethleyi, Khaustov, 2017

Khaustov, Alexander A., 2017, Review of the Paratydeidae (Acari: Prostigmata), with description of three new species, Zootaxa 4303 (2), pp. 151-212 : 202-204

Tanytydeus kethleyi sp. nov.

( Figs. 52–55 )

Description. FEMALE ( Figs. 52–55 ). Idiosoma very long and narrow. Length of idiosoma 345 (340–380), width 92 (90–115). Gnathosoma ( Figs. 53 ). Palptarsus with three eupathidia (ul’ eupathidion-like). Subcapitular setae n slightly longer than m and both longer than subequal or 1-2. Idiosomal dorsum ( Fig. 52 A). Hysterosoma with transverse furrows between setal rows d-e, e-f and h-ps, respectively. All idiosomal setae smooth. Dorsal idiosomal setae ve, sce and c 2 pointed, other dorsal setae needle-like. Cupules im situated anterolaterally to setae e, cupules ip situated laterally to setae f 1 and anteromedially to setae f 2. Idiosomal venter ( Fig. 52 B). Setae 1 d, 2 b, 3 a, 3 b, 3 c, 4 b, ps 2, ad 2 with slightly rounded tips, other ventral setae pointed. Genital area with three pairs of aggenital setae and two pairs of genital setae. Two pairs of genital acetabulae. Cupules ia situated anterolaterally to setae 3 a near lateral margin of the body; cupules ih situated anterolaterally to setae ps 3. Lengths of idiosomal setae: ve 8 (7–8), sci 27 (25–28), sce 9 (8–9), c 1 10 (9–10), c 2 16 (14–16), d 9 (9–10), e 10 (9–10), f 1 10 (10–11), f 2 15 (15–17), h 1 15 (14–15), h 2 16 (16–17), ps 1 15 (14–15), ps 2 13 (13–14), ps 3 18 (17–18), ad 1 10 (9–10), ad 2 13 (12–13), ad 3 11 (10– 11), 1 a 12 (10–12), 1 b 11 (9–11), 1 c 7 (6–7), 1 d 6 (6–7), 2 a 13 (13–14), 2 b 11 (11), 2 c 7 (7), 3 a 13 (13), 3 b 9 (9), 3 c 11 (10–11), 4 a 7 (7), 4 b 8 (7–9), ag 1 9 (9), ag 2 8 (6–8), ag 3 11 (9–11), g 1-2 5 (4–6). Legs ( Figs. 54 , 55 ). Lengths of legs: leg I 110 (110), leg II 63 (62–65), leg III 68 (65–69), leg IV 74 (74–77). Leg I ( Fig. 54 A). Leg setation: Tr 0, Fe 3/5 (d, l’, l”, v’, v”, d 1, l’ 1, bv”), Ge 7(1) (d, l’, l”, v’, v”, l’ 1, l” 1, σ), Ti 8(1) (d, l’ξ, l”ξ, v’, v”, k, l’ 1, l” 1, φ), Ta 14(2) (p’ξ, p”ξ, tc’ξ, tc”ξ, ft’ξ, ft”ξ, a’, a”, u’, u”, s, pl”, pv’, pv”, ω 1, ω 2). Sensory pits on tarsus I oval; ω 1 oblique aligned between setae ft” and tc’, ω 2 situated posterolaterally to ft’. Empodium short, about two times shorter than tarsal claws. Setae k, d of tibia, d, l”, l” 1 of genu, d, l”, d 1, l’ 1 of femur blunt-ended. Leg II ( Fig. 54 B). Leg setation: Tr 1 (v’), Fe 2 (d, bv”), Ge 3(1) (d, l’, l”, σ), Ti 4(1) (d, l’, v’, v”, φ), Ta 7(1) (p’, p”, tc ’, tc”, u’, u”, ε, ω). All leg setae blunt-ended. Empodium about two times shorter than tarsal claws. Leg III ( Fig. 55 A). Leg setation: Tr 1 (v’), Fe 3 (d, v’, ev’), Ge 2 (l’, v’), Ti 3(1) (d, v’, v”, φ), Ta 6 (tc ’, tc”, p’, p”, u’, u”). Claws and empodium of same shape as on tarsus II. Seta p’ weakly barbed; setae ev’ and (u) pointed, other leg setae blunt-ended. Leg IV ( Fig. 55 B). Leg setation: Tr 0, Fe 1/2 (d, v’, ev’), Ge 2 (d, v’), Ti 3 (d, v’, v”), Ta 5 (p’, p”, tc, u’, u”). Setae (u) pointed, other leg setae blunt-ended; seta p’ weakly barbed.

DEUTONYMPH. Length of idiosoma 310–330, width 86–100. Similar to female, but differs by genital area with two pairs of genital and aggenital setae and absence of seta 4 b of coxal fields IV. Lengths of idiosomal setae: ve 7, sci 25–26, sce 9, c 1 9, c 2 15, d 9, e 8–9, f 1 10–11, f 2 15–16, h 1 14–15, h 2 17, ps 1 14–15, ps 2 12–13, ps 3 16–18, ad 1 9–10, ad 2 10–13, ad 3 8–11, 1 a 10–11, 1 b 9, 1 c 5–7, 1 d 5–6, 2 a 12–13, 2 b 11, 2 c 6–7, 3 a 13, 3 b 9–11, 3 c 10–11, 4 a 7, ag 1-2 7–8, g 1-2 5–6. Legs. Lengths of legs: leg I 105–110, leg II 60 –64, leg III 65 –70, leg IV 72 –74. Leg I as in female except absence of seta l’ 1 of basifemur I and seta l” of tibia is not eupathidion-like. Legs II–IV as in female.

MALE, LARVA, PROTONYMPH, TRITONYMPH unknown.

Type material. Female holotype, slide #83-59b, USA, Iowa, Whiteside Co., Morrison-Rockwood St, Pk, 12 ml N Morrison, 8.V.1983, clay soil 13-24” depth, col. J.B. Kethley; paratypes: 23 females, 7 deutonymphs same data.

Type deposition. All type material deposited in the Field Museum of Natural History , Chicago, USA.

Etymology. The new species is named after the well-known American acarologist Dr John Kethley for his great contribution to study of prostigmatic mites.

Differential diagnosis. The female of a new species is very similar to T. aegypticus ( Soliman, 1974) by sharing the same idiosomal and leg setation; study of additional specimens from wider geographic regions may prove they are conspecific. The female of the new species differs from T. aegypticus by having distinctly shorter idiosomal setae: sci 25–28, sce 8–9, c 2 14–16, 2 a 13–14, 2 b 11, 3 a 13, 3 b 9 (vs. distinctly longer: sci 46, sce 17, c 2 26, 2 a 26, 2 b 24, 3 a 33, 3 b 19 in T. aegypticus ) and by blunt-ended setae on most leg segments (vs. most leg setae pointed in T. aegypticus ).

Figures

FIGURE 52. Tanytydeus kethleyi sp. nov., female: A—body in dorsal view, B—body in ventral view.

FIGURE 53. Tanytydeus kethleyi sp. nov., female: A—gnathosoma in dorsal view, B—subcapitulum.

FIGURE 54. Tanytydeus kethleyi sp. nov., female: A—leg I in dorsal view, B—leg II in dorsal view.

FIGURE 55. Tanytydeus kethleyi sp. nov., female: A—leg III in dorsal view, B—leg IV in dorsal view.