Hafenrefferia eurycuspis, Zhang & Jin, 2016

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 : 245-247

Hafenrefferia eurycuspis sp. nov. ( Figs 8–14 )

Diagnosis. Middle part of rostrum deeply notched, creating two pointed teeth ( Fig. 10 ). Lamellae fused together at base of lamellae cusps. Cusps long, broad, with two projections on end of cusp, inner projection markedly developed ( Fig. 12 ).

Sensillus clavate ( Fig. 13 ). Humeral process short, triangular blade-like, no marginal serrations ( Fig. 8 ).

Description. General color very dark brown. Integument shiny. Large, body length 1290–1350, width 1020–1030.

Prodorsum ( Figs 8, 10–13 ). Middle part of rostrum deeply notched, creating two sharply teeth. For anterior part of prodorsum steepened, teeth appeared to blunt shape in dorsal view. Rostral setae (73) inserted behind rostral notches. Tutorium slender, tapering, and exceeded slightly insertion of rostral seta. Lamellae fused together at base of lamellae cusps, so lateral contour of prodorsum visible in dorsal aspect. Cusps long, broad, with two projections on end. The inner one was longer than the outer one. Lamellar setae (100) inserted terminally in cups, and in close proximity to the outer projection. Rostral setae<lamellar setae<interlamellar setae (153), setiform and barbed. Sensillus (150) clavate, with distal half slightly barbed.

Notogaster ( Fig. 8 ). 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. 14 ), longer than wide. Subcapitulum setae setiform, h, m and a 73, 52, and 38 in length respectively. Chelicerae chelate-dentateVentral region ( Fig. 9 ). Epimeral borders distinctly. Third and fourth epimeral borders united with anterior border of genital opening. Taenidium and minitectum of epimeral border IV present, very short. Epimeral setal formula: 4-1-3-3, all setae barbed, seta 1d inserted near corner formed by podecephalic and mentotectum. Genital aperture in the ship of pentagon. 6 pairs of setae, anterior two setae longest. Irregular, longitudinal furrows present on the surface of genital plates. 1 pair of aggenital setae present. Anal plates much larger than genital plates, longer than wide, with 2 pairs of setae. 3 pair of adanal setae present. Lyrifissure iad located in front of seta ad 3, well removed from anal aperture.

Legs. Tridactyle. Chaetotaxy of leg Tr-Fe-Ge-Ti-Ta (famulus included, solenidia in parentheses): leg I 1-5-3(1)-4(1)- 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. Femur of leg IV with a narrow ventral blade throughout its length.

Material examined. Holotype China, Shanxi, Taibaishan National Forest Park (33°12 ′ N, 107°89 ′ E; elev. 2280 m), 18 July 2012, Wenqin Liang, Qiouxiao Tang. Paratype, 1 adult, same data as holotype .

Etymology. The specific name “ eurycuspis ” refers to broad cusps of lamellae.

Remarks. Hafenrefferia eurycuspis sp. nov. mainly differs from H. acuta and H. gilivipes by following characteristics: 1) Two teeth present on rostrum, the latter two known species have three teeth ( Fig. 3 ). 2) Lamellar cusps long, broad. The other known members of Hafenrefferia have narrow, gradually tapering distally ( Fig. 1 ), which is generic diagnosis according to Norton (1983). Though the shape of lamellar cusps of the new species don’t conform to the generic diagnosis, the new species and other members of the genus share other generic characters.

Figures

Figures 8–14. Hafenrefferia eurycuspis sp. nov. 8. Dorsal view. 9. Ventral view. 10. Prodorsum, dorsal-later view. 11. Anterior part of prodorsum, dorsal view. 12. Lamellae with cusps and lamellar setae. 13. Sensillus and bothridium. 14. Subcapitulum, ventral view, right half. Scale bars =100 µm.

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.