Suctobelbella triangulata, Liu, Dong & Wu, Donghui, 2013

Liu, Dong & Wu, Donghui, 2013, Three new species of the genus Suctobelbella (Acari: Oribatida: Suctobelbidae) from Sanjiang Plain, Northeast China, Zootaxa 3637 (2), pp. 131-138 : 131-132

Suctobelbella triangulata sp. nov.

( Figs. 1 -9)

Material examined: Holotype: adult (in alcohol, LD-10-270), China: Heilongjiang Province, Shuangyashan City, Baoqing County, Bawusan Farm (46°30'30.76"N, 133°15'18.00"E), from litter, 142 m a.s.l., 16 Aug., 2010, leg. Dong Liu and Donghui Wu. Paratypes: 2 adults (in alcohol, LD-10-277), same data as holotype, from litter under poplar tree; 4 adults (in alcohol, LD-10-199), same data as holotype.

Etymology. The new specific name “ triangulata ” is from Latin and refers to the shape of lamellar knob.

Measurements: Holotype: length of body: 280, width of body: 155, length of prodorsum: 115, width of prodorsum: 102.

Surface of prodorsum covered with many tubercles except tectopedial fields smooth; rostral apex medially concaved with a long, slender and acute tooth bilaterally (directed downwards, not projecting distinctly beyond rostral apex in dorsal view), followed by two large rostral teeth: 1st one thick and slightly rounded, 2nd one smaller, slender and acute; tectopedial fields elongate oval in shape, with irregular inner margin and opened anterior margin; lamellar knob developed and triangular in shape; interbothridial fields and bothridial lobes distinct; sensilla with long stalk and short spindle-shaped head; the head pointed at tip, with bristles densely on outer edge; rostral setae geniculate and ciliated on the basalin the basal half; lamellar setae thin and medium long, directed forward; interlamellar and exobothridial setae short and fine.

Notogaster oval in shape; notogastral condyles large and triangular, co.nl slightly smaller, connected with co.nm basally; nine pairs of notogastral setae present, smooth, long setiform and gently curved; all setae nearly same length except for h 1, p1, p2 which are short; setae c far from the posterior margin of co.nl; setae la inserted at the level between c and lm, more close to setae c; setae lm not reaching the insertion of setae lp.

Epimeral borders not touching medially, epimeral cavity indistinct; epimeral setae short and fine, no essential difference among them; epimeral formula: 3-1-2-3; six pairs of genital setae present, g1 longer than the rest setae, setae g5 and g6 situated closely at a middle portion along the width of plate, setae g1 to g4 converging anteriorly to inner margin; one pair of aggenital setae present, arising far laterally; three pairs of adanal setae and two pairs of anal setae present; setae ad1 inserted at the level between setae an1 and an2; lyrifissures iad paraanal near anal anterior margin; relative length of setal intervals: ag - ag> ad2 - ad2> ad3 - ad3 ≈ ad1 - ad1.

Setae h of mentum shorter than distance between them; setal counts for leg segments: I: 1-4-2(1)-4(2)-18(2); II: 1-4-1(1)-4(1)-14(2), III: 2-3-1(1)-2(1)-14, IV: 1-2-1-2(1)-9; all legs monodactylous.

Distribution. Known only from the type locality.

Remark. This new species is similar to Suctobelbella prominens ( Moritz, 1966) in the presence of similar shape of closely adjacent rostral teeth, spindle-shaped ciliated sensilla, and similar size of the body and notogastral setae, but can be easily distinguished from the latter species by following characters: only two rostral teeth present; lamellar knob triangular in shape; rostrum slightly narrower; the head of sensilla without terminal spine; tectopedial fields opened anteriorly; co.nl large, connected with co.nm basally.

Figures

FIGURES 1̵9. Suctobelbella triangulata sp. nov.: 1, dorsal view of body (legs removed); 2, ventral view of body (legs removed); 3, dorsal view of rostral teeth; 4, lateral view of rostral teeth; 5, leg I; 6, leg II; 7, trochanter, femur, genu of leg III; 8, tibia and tarsus of leg III; 9, leg IV. Scale bars: 1, 2, 5–9=50μm; 3, 4=25μm.