Fissicepheus (Fissicepheus) wangae, Zheng & Chen, 2018

Zheng, Li-Hao & Chen, Jun, 2018, Taxonomic study on the genus Fissicepheus (Acari: Oribatida: Otocepheidae) from China, Zootaxa 4410 (3), pp. 539-550 : 548

Fissicepheus (Fissicepheus) wangae sp. nov.

( Fig. 5 )

Material examined: Holotype: adult (in alcohol, DW-12-09), CHINA: Beijing City, Songshan Mt. (40°29′26″N, 115°49′09″E), 680m a.s.l., 1 Jul., 2012, Wei Duan, from litter under shrub . Paratype: 1 adult (in alcohol, DW-12- 09), same data as holotype .

Etymology. The name of the new species is dedicated to Prof. Hui-Fu Wang, one of the famous acarologists who made an important contribution to the study of oribatid mites in China.

Description. Measurements. Holotype: body length 630, width 340, notogastral length 400, setae lengths: ss 70, in 55, le 85, ro 70, ex 10, mutual distances of setae: c -c 117, la -la 225, lm -lm 160, lp -lp 280, h 2- h 2 205, h 1- h 1 115. Paratype: body length 530, width 275.

Prodorsum ( Fig. 5a ). Rostrum slightly notched medially. Seta ro and le curved inward, nearly smooth. Seta le inserted almost at tip of lamella. Interlamellar prodorsum with fine foveolae. Length of seta in shorter than their mutual distance. Distance of outer margins of lamellae at the level of apexes of pedotecta I accounting for ca. 48% (holotype) of distance between apexes of pedotecta I. Fine tubercles found on outer side of lamella. Tbd curved inward, tbv slightly curved inward. Ss with long peduncle and apical margin of swollen head somewhat jagged ( Fig. 5b ). Two pairs of prodorsal condyles present, co.pm distinctly projected backward. Mutual distance: tbv - tbv> co.pl -co.pl.

Notogaster ( Figs. 5a, c ). L/W of notogaster about 1.2 (holotype). Surface of notogaster densely punctate. Two pairs of notogastral condyles present, co.nl triangular with rounded tip, co.nm broad, connected with each other. Lateral margin of notogaster behind co.nl slightly waved. Ten pairs of notogastral setae (c, la, lm, lp, h 1, h 2, h 3, p 1, p 2, p 3) nearly same in length (range 45–60), smooth, with fine tips. Lyrifissures ih and ips situated anterior to h 3.

Venter ( Fig. 5d ). One pair of setae h present. Surface of ventral plate punctate. Epimeral setal formula: 2-0-2-3. Apo.2 and apo.sj distinctly developed, apo.3 short. Surface of genital plate nearly smooth. Four pairs of genital setae present, mutual distances g 1- g 1= g 2- g 2= g 4- g 4<g 3- g 3. Co.ag poorly developed, not so conspicuous. Anal plate well punctate, with two pairs of anal setae, mutual distance an 1- an 1<an 2- an 2, three pairs of adanal setae, ad 3- ad 3 at level before anterior margin of anal opening. Adanal lyrifissure (iad) situated right ahead of ad 3.

Legs. All legs monodactyle, all ultimate setae L-type. Formulae of leg setation and solenidia: I (1-4-3-4-16) [1- 2-2], II (1-4-3-3-16) [1-1-2], III (2-3-1-2-14) [1-1-0], IV (1-2-1-2-12) [0-1-0].

Remarks. F. wangae n. sp. is most similar to F. chinensis from Jiangsu, China in having a swollen sensillar head, a less conspicuous co.ag, and le inserted at tip of lamella. These two species can be easily distinguished from each other as follows: in F. chinensis , co.nm absent, epimeral setal formula 2-0-1-3; in F. wangae , co.nm present, epimeral setal formula 2-0-2-3. It is also similar to F. subclavatus Mahunka, 1971 from Korea in having a swollen sensillar head, two pairs of prodorsal condyles and two pairs of notogastral condyles, le inserted at tip of lamella. It differs from the latter as follows: in F. subclavatus , seta ex long and can easily be seen in dorsal view, co.nm triangular and separated from each other; in F. wangae , seta ex short and invisible in dorsal view, co.nm broad and broadly connected with each other.

Figures

FIGURE5. Fissicepheus (Fissicepheus) wangae n. sp.: a, dorsal aspect (legs removed); b, sensillus; c,prodorsal condyles and notogastralcondyles; d, ventral aspect (legs and mouthparts removed).