Euphthiracarus macrorostralis, Liu, Dong, Wu, Donghui & Chen, Jun, 2012

Liu, Dong, Wu, Donghui & Chen, Jun, 2012, Six new species of the genus Euphthiracarus (Acari: Oribatida: Euphthiracaridae) from China, Zootaxa 3481, pp. 47-59 : 47-49

Euphthiracarus macrorostralis sp. nov.

( Figs. 1–3 )

Material examined: Holotype: adult (in alcohol, W-90-28), China: Sichuan Province, Songpan County, Huanglongsi (32°44'59.89"N, 103°57'40.32"E), from litter, 3000 m a.s.l., 3 Jul., 1990, leg. Fu-Sheng Huang. Paratype: one adult (in alcohol, W-90-25), China: Sichuan Province, Songpan County, Zalitai, from litter, 3000 m a.s.l., 2 Jul., 1990, leg. Fu-Sheng Huang.

Etymology. The new specific name “ macrorostralis ” is from Latin and refers to the long and robust rostral setae.

Measurements: Holotype: Prodorsum: length 300, width 215, height 115, setae: ss 110, ro 110, in 127, le 90, ex 35, distance between setae: ro–ro 67, in–in 100, le–le 55, in–le 95, le–ro 55; notogaster: length 645, width 420, height 425; setae: c1 105, c2 95, c3 75, c p 77, d1 75, d2 75, e1 80, e2 80, h1 105, h2 85, h3 77, ps1 95, ps2 90, ps3 80; distance between setae: c1–d1 157, d1–e1 170, e1–h1 175, h1–ps1 120; ventral region: genitoaggenital plate 280×90, anoadanal plate 300×85. Paratype: Prodorsum: length 330, width 225, height 115; notogaster: length 660, width 385, height 400; ventral region: genitoaggenital plate 255×100, anoadanal plate 325×82.

Colour yellowish. Surface of body smooth, except dorsal region of prodorsum finely foveolate.

Prodorsum with two parallel lateral carinae on each side, upper carina waved, stronger and longer than lower one; sensilla bacilliform, covered with small and sparse spines in distal half; interlamellar and lamellar setae robust, erect, covered with spines in distal half; rostral setae long, rough and semi-erect, bent distally, thicker than all other prodosal and notogastral setae; exobothridial setae short and fine; comparative length: in>ro = ss> le>ex.

Notogaster setae relatively short, similar in shape to interlamellar setae, barbed in distal half; setae c1–3 remote from anterior border, setae c1 slightly more so than setae c2 and c3; vestigial setae f1 located anteriorly of setae h1; arrangement of opisthosomal glands and lyrifissures typical for genus.

Genital plates each with nine setae, g1–3 short and fine, located in progenital position, other setae thicker and longer, spiniform; two pairs of aggenital setae present, spiniform, equally thick, ag2 about twice as long as ag1; setae an1 and an2 smooth and flagellate at distal end, setae an3 and adanal setae shorter, robust and covered with small and sparse spines in distal half; lyrifissures iad situated between setae an3 and ad3.

Setae h of mentum longer than distance between them; palps three-segmented with setal formula: 2-2-8(1); chaetotaxy of legs (without tarsi): I: 1-3-5(2)-5(1); II: 1-4-4(1)-5(1), III: 2-2-2(1)-2(1), IV: 2-1-1(1)-2(1); all legs heterotridactylous.

Distribution. Known only from the type locality.

Remark. This new species is similar to E. cribrarius ( Berlese, 1904) , but differs from the latter species by following characters: surface of notogaster smooth; rostral setae robust, thicker than all other setae, bent distally; rostral setae longer than lamellar setae.

Figures

FIGURES 1 – 3. Euphthiracarus macrorostralis sp. nov.: 1, lateral view of body (legs removed); 2, prodorsum, dorsal view; 3, left side of ventral plate. Scale bars = 50 μm.