Fissicepheus (Fissicepheus) combicondylus, 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 : 542-544

Fissicepheus (Fissicepheus) combicondylus sp. nov.

( Fig. 2 )

Material examined: Holotype: adult (in alcohol, LD-08-69), CHINA: Guangdong Province: Ruyang County, Babao Mt. (24°55'42.9"N, 113°0'57.3"E), 1030m a.s.l., 16 Jul., 2008, leg. Dong Liu.

Etymology. The specific epithet “ combi ” is from Latin for “combine, unite” and refers to the fused median notogastral condyles.

Description. Measurements. Holotype: body length 860, width 380, notogastral length 545, setae lengths: ss 40, in 60, le 100, ro 95, ex 20, mutual distances of setae: c -c 130, la -la 230, lm -lm 185, lp -lp 325, h 2- h 2 230, h 1- h 1 160.

Prodorsum ( Fig. 2a ). Fine foveolae present on prodorsum. Rostrum rounded. Seta ro and le glabrous, curved inward. Le inserted behind tip of lamella. In glabrous, shorter than their mutual distance. Distance between outer margins of lamellae at the level of apexes of pedotecta I accounting for ca. 36% of distance between apexes of pedotectae I. Tutorium well developed. Dense granules found posterlaterally on prodorsum. Ss peduncle short, with strongly expanded and rounded head ( Fig. 2b ). Two pairs of prodorsal condyles present, co.pl peach-shaped, co.pm semicircular. Mutual distance between ventral bothridial plate (tbv) larger than that between co.pl.

Notogaster ( Fig. 2a ). L/W of notogaster about 1.4. Surface of notogaster densely punctate. Two pairs of notogastral condyles present, co.nl triangular, co.nm wide, fused to each other, with broadly rounded apex. Ten pairs of notogastral setae (c, la, lm, lp, h 1, h 2, h 3, p 1, p 2, p 3) present with nearly equal length (range 50–75), and fine tips. Lyrifissures ih and ips situated anterior to h 3.

Venter ( Fig. 2c ) Subcapitulum with one pair of setae h. Surface of ventral plate punctate. Epimeral setal formula: 2-0-2-3. Apo.2 and apo.sj developed distinctly, apo.3 short. Surface of genital plate nearly smooth, with four pairs of genital setae, g 1, g 2, g 4 nearly lined along medial margin, g 3 removed to central part. Co.ag well developed. Anal plate conspicuously punctate, with two pairs of anal setae, mutual distance an 1 -an 1<an 2 -an 2. Three pairs of adanal setae present, ad 3 somewhat shorter than ad 2 and ad 1, ad 3 inserted at the level a little behind anterior margin of anal opening. Adanal lyrifissure (iad) situated not far anterior to ad 3.

Legs. All legs monodactyle, all ultimate setae L-type. Formulae of leg setation and solenidia: I (1-4-3-4-18) [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. This new species is close to F. clavatus from Japan in having four pairs of prodorsal and notogastral condyles and head of ss expanded and rounded. They can be distinguished by: in this new species, spa.l separated from each other, co.nm wide, fused to each other, with broadly rounded heads; in F. clavatus , spa.l well developed, fused to each other to form a brim-like structure, and co.nm well separated.

Figures

FIGURE 2. Fissicepheus (Fissicepheus) combicondylus n. sp.: a, dorsal aspect (legs removed); b, sensillus; c, ventral aspect (legs and mouthparts removed).