Eryngiopus techuelche, Khaustov, 2016

Khaustov, A. A., 2016, New species and records of mites of the family Stigmaeidae (Acari: Prostigmata) collected from mosses in Southern Chile, Acarologia 56 (4), pp. 639-679 : 673-679

Eryngiopus techuelche n. sp.

( Figures 31-35 )

Description

Female ( Figures 31-35 ) — Length of idiosoma 365, width 185.

Idiosomal dorsum ( Figures 31A , 35A, B ) — Idiosoma fusiform, soft, mostly striated. Eyes present. Propodosomal plate divided into two separated longitudinally aligned parts bearing setae vi and ve ( Figure 35B ). All dorsal setae uniform, bluntended and weakly barbed. Setae c 2 situated dorsally. Suranal plate divided, with two pairs of setae ( Figure 35A ). A pair of platelets situated between setae c 1 and d 1; another pair of very small platelets situated anteriorly to setae e 1. Lengths of dorsal setae: vi 17, ve 26, sci 26, sce 31, c 1 27, c 2 30, d 1 22, d 2 24, e 1 16, e 2 16, f 1 23, h 1 29, h 2 33.

Idiosomal venter ( Figure 31B ) — Ventral setae smooth and pointed, except weakly barbed and blunt-ended ps 1-2. Two pairs of aggenital setae; ag 1 situated on soft cuticle; ag 2 on weakly defined platelet. Another small platelet situated posterolaterally to seta ag 2. One pair of genital setae. Cuticle posteriad to gnathosomal base with microtubercles. Setae 1 a, 3 a and 4 a very long. Coxal fields IV with one pair of setae. Lengths of ventral setae: 1 a 81, 1 b 20, 1 c 22, 2 b 27, 3 a 67, 3 b 25, 3 c 27, 4 a 81, 4 b 24, ag 1 22, ag 2 28, g 30, ps 1 19, ps 2 17, ps 3 23.

Gnathosoma ( Figure 32 ) — Tibial claw large. Setae l’ of palpal tibia thin, seta-like. All palpal setae pointed and smooth. Number of setae on palpal segments: Tr 0, Fe 3 (d, l’, v"), Ge 1 (d), Ti 3 (d, l’, l"), Ta 8(1) (fused eupathidia ul’, ul", sul, eupathidion acm, ba, bp, lp, 1 solenidion ω). Setae v" of femur very short ( Figure 35C ). Palpal supracoxal setae (ep) small, thick, with distinctly rounded tip. Chelicerae dorsally smooth ( Figure 35D ). Rostrum of subcapitulum long. Subcapitular setae pointed; and smooth. Setae n very long. Basal part of subcapitulum without reticulation ( Figure 35C ). Lengths of subcapitular setae: m 26, n 70, or 1 14, or 2 15.

Legs ( Figures 33 , 34 ) — Empodial raylets distinctly capitate. Leg segments without reticulation. Leg I ( Figure 33A ). Coxae I posterodorsally with small, thick, with distinctly rounded tip leg supracoxal setae (el). Leg setation: Tr 1 (v’), Fe 4 (d, l’, l", bv"), Ge 4 (d, l’, l", k), Ti 5(1) (d, l’, l", v’, v", φp), Ta 13(1) (p’, p", tc’, tc", ft ’, ft", u’, u", a’, a", pl’, pl", vs, ω). Setae d of tibia, (p) and (tc) of tarsus are eupathidia. Seta k 4 needle-like. Solenidion ω short 8, finger-shaped; solenidion φp 12 uniformly thin. All leg setae smooth. Leg II ( Figure 33B ). Leg setation: Tr 1 (v’), Fe 4 (d, l’, l", bv"), Ge 1 (l’), Ti 5(1) (d, l’, l", v’, v", φp), Ta 9(1) (p’, tc’, tc", u’, u", a’, a", pl’, vs, ω). Solenidion ω 6 finger-shaped; solenidion φp 10 uniformly thin. All leg setae smooth. Setae d of tibia and tc" of tarsus long. Leg III ( Figure 34A ). Leg setation: Tr 1 (v’), Fe 2 (d, ev’), Ge 0, Ti 5(1) (d, l’, l", v’, v", φp), Ta 7(1) (tc’, tc", u’, u", a’, a", vs, ω). Solenidion ω 5 baculiform; solenidion φp 9 uniformly thin. Setae d of tibia and (tc) of tarsus very long. All leg setae smooth. Leg IV ( Figure 34B ). Leg setation: Tr 0, Fe 2 (d, ev’), Ge 0, Ti 5(1) (d, l’, l", v’, v", φp), Ta 7(1) (tc’, tc", u’, u", a’, a", vs, ω). Solenidion ω 4 baculiform; solenidion φp 7 uniformly thin. Setae d of tibia and (ts) of tarsus very long. All leg setae smooth.

Male and immatures unknown.

Type material — Female holotype, slide AT260115 /S2, Chile, the Region of Magallanes, Nothofagus forest, in Sphagnum sp. , 53°41’08.8"S, 70°58’24.2"W, 26 January 2015, coll. A.V. Tolstikov.

Etymology — The name of the new species is derived from the name of Tehuelche people, a group of Amerindian tribes indigenous to Patagonia and the southern pampas regions of Argentina and Chile.

Differential diagnosis — The new species is most similar to E. similis Wood, 1967 , described from New Zealand ( Fan and Zhang 2005), by divided propodosomal and suranal plates and similar leg setation. However, it differs from the latter by very short seta v" of palpfemur (vs. well-developed in E. similis ), by much longer setae (tc) on tarsi III and IV, presence of small platelets anteriorly to setae e 1 (vs. absent in E. similis ).

Figures

FIGURE 31: Eryngiopus techuelche n. sp., female: A – idiosomal dorsum, B – idiosomal venter.

FIGURE 32: Eryngiopus techuelche n. sp., female: A – gnathosoma dorsally, B – subcapitulum.

FIGURE 33: Eryngiopus techuelche n. sp., female: A – leg I, B – leg II.

FIGURE 34: Eryngiopus techuelche n. sp., female: A – leg III, B – leg IV.

FIGURE 35: DIC micrographs of Eryngiopus techuelche n. sp., female: A – opisthosoma dorsally, B – prodorsum, C – gnathosoma ventrally, D – gnathosoma dorsally.