Hafenrefferia gilvipes (Koch, 1839)

Zhang, Yan & Jin, Daochao, 2016, Two new species and two newly recorded species of Tenuialidae in China, with an updated key to the family (Acari: Oribatida: Gustavioidea), Zoological Systematics 41 (3), pp. 243-252 : 244

Hafenrefferia gilvipes (Koch, 1839) New record to China ( Figs 1–7 )

Oribata gilvioes Koch, 1839: 30 .

Hafenrefferia gilvioes: Oudemans, 1917: 29–31 , figs 53–57; Sellnick, 1952: 229–232, figs 3–5; Woolley & Higgins, 1955: 53–55, figs 8–9; Aoki & Shimano, 2011: 68–69, fig. E.

Liacarus pterotus Coggi, 1900: 322 , fig. 5.

Diagnosis. Lamellae fused together at base of lamellae cusps. Cusps long, narrow, gradually tapering distally. Sensillus somewhat clavate, but pointed at distal end ( Fig. 5 ). Humeral process short, triangular blade-like, with heavily sclerotized medial margins, without marginal serrations ( Fig. 1 ).

Description. General color very dark brown. Integument smooth and shiny. Body length 820–980, width 610–720.

Prodorsum ( Figs 1, 3–5 ). Rostrum deeply notched, lateral teeth pointed, medial one strongly bent ventrally, causing blunt shape in dorsal view; rostral setae (50) inserted behind rostral notches. Tutorium slender, tapering, and exceeded slightly insertion of rostral setae. Lamellae fused together at base of lamellae cusps, so lateral contour of prodorsum visible in dorsal aspect; cusps long, narrow, gradually tapering distally, with two projection on end; lamellar setae (75) inserted terminally in cups. Rostral setae, lamellar setae and interlamellar setae (108) setiform, robust and barbed. Sensillus (94) somewhat clavate, with distal half slightly thickened, but pointed at distal end.

Notogaster ( Fig. 1 ). Notogaster polished and obviously convex. Without visible setae and porosae areae, but with ten pairs of alveoli (c, la, lm, lp, h 1, h 2, h 3, p 1, p 2, p 3) and five pairs of lyrifissures (ia, im, ih, ips, ip). Humeral process short, triangular blade-like, with heavily sclerotized medial margins, no marginal serrations present.

Gnathosoma. Subcapitulum diarthric ( Fig. 7 ), longer than wide. Subcapitulum setae setiform, h, m and a 40, 32, and 33 in length respectively. Chelicerae chelate-dentate.

Ventral region ( Fig. 2 ). Third and fourth epimeral borders united with anterior border of genital opening. Epimeral setal formula: 4-1-3-3. Genital aperture pentagon-shaped, with 6 pairs of setae, anterior two setae longest. 1 pair of aggenital setae present. Anal plates much larger than genital plates, trapezoidal, longer than wide, with 2 pairs of setae. 3 pair of adanal setae present. Lyrifissure iad located in front of seta ad 3.

Legs. Tridactyle. Chaetotaxy of leg Tr-Fe-Ge-Ti-Ta(famulus included, solenidia in parentheses): leg I 1-5-3(1)-4(2)- 20(2); leg II 1-4-3(1)-4(1)-16(2); leg III 2-3-2(1)-3(1)-15; leg IV 1-2-3-3(1)-12.

Material examined. 6 adults, China, Heilongjiang, Maoershan Forest Park (45°16 ′ N, 115°23 ′ E), 17 July 2010, Lixia Xie, Daxin Yang and Rong Huang ; 15 adults, China, Heilongjiang, Mudanfeng National Nature Reserve (44°27 ′ N, 129°43 ′ E), 19–20 July 2010, Lixia Xie, Daxin Yang and Rong Huang ; 5 adults, China, Heilongjiang, Fenling National Nature Reserve (48°07 ′ N, 129°13 ′ E), 22–23 July 2010, Lixia Xie, Daxin Yang and Rong Huang ; 2 adults, China, Heilongjiang, Liangshui National Nature Reserve (47°10 ′ N, 128°52 ′ E), 24 – 26 July 2010, Lixia Xie, Daxin Yang and Rong Huang .

Distribution. China (Heilongjiang), Japan, Russia, Latvia, Czech, Hungary, Italy, Germany.

Remarks. Hafenrefferia gilvipes closely resembles to H. acuta Aoki, 1966 which had been recorded in China. Aoki (1966) noted that H. gilvipes differs from H. acuta by the differences of sclerotized median margins of humeral process, projections of lamellar cusps, sensillus and anal aperture. Aoki (1966) indicated that only the outer projection of lamellar cusps of H. acuta markedly developed, and the inner one of H. gilvipes developed more markedly than outer one. In our materials, the inner one of H. acuta developed more markedly than outer one, and the outer one of H. gilvipes was longer than the inner one. Anal aperture of our materials also showed no sensible difference between the two species. In our opinion, the principal difference between the two species are as follows: 1) Sensillus of H. gilvipes somewhat clavate, with the distal half slightly thickened ( Fig. 5 ), while the latter’s sensillus setiform with sparsely ciliate ( Fig. 6 ). 2) Humeral process with heavily sclerotized medial margins in H. gilvipes , while in the latter the medial margins of scapular process sclerotized heavily only in its posterior half.

Additionally, H. gilivipes is widely distributed in Europe. In China, the species was found only in Heilongjiang Province (Palearctic). H. acuta was widely found in China (Heilongjiang, Liaoning, Ganshu, Hebei, Heinan, Shanxi, Sichuan, Guiyang, Yunnan), encompassed Palearctic and Oriental Regions.

Figures

Figures 1–7. Hafenrefferia gilvipes (Koch, 1839). 1. Dorsal view. 2. Ventral view. 3. Prodorsum, dorsal-later view. 4. Lamellar cusp, dorsal view, left. 5. Sensillus. 6. Sensillus of Hafenrefferia acuta Aoki, 1966. 7. Subcapitulum, ventral view, right half. Scale bars= 100µm.