Chistyakovella, Ermilov, Sergey G., Aoki, Jun-Ichi & Anichkin, Alexander E., 2013

Ermilov, Sergey G., Aoki, Jun-Ichi & Anichkin, Alexander E., 2013, Description of Chistyakovella insolita gen. nov., sp. nov., and redescription of the type species of Diplobodes, D. kanekoi Aoki, 1958 (Acari: Oribatida: Carabodidae), Zootaxa 3608 (3), pp. 178-190 : 179-182

Genus Chistyakovella gen. nov.

Diagnosis. Lamellae large, simple, separated, but touching medially, forming a triangular interlamellar region. Translamella absent. Rostral setae setiform, inserted on rostrum. Lamellar setae thick. Interlamellar setae setiform, inserted mediodistally on lamellae. Sensilli setiform, with strong spines unilaterally on weakly developed sensillar head. Tutorium lineate. Fifteen pairs of setiform, notogastral setae present, with only lp and h 3 closely positioned. Notogaster with large apophyses, bearing nine pairs of notogastral setae (c 1, da, dm, dp, la, lm, lp, h 2, h 3). Two pairs of notogastral setae (c 2, c 3) inserted close to humeral regions of notogaster. Posterior of notogaster with four pairs of notogastral setae (h 1, p 1– p 3). Epimeral setal formula 3–1–3–3. Four pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae present. Leg tarsi with one claw.

Type species. Chistyakovella insolita sp. nov.

Etymology. The genus is named after the late Dr. Mikhail P. Chistyakov, the oribatologist from Nizhniy Novgorod, Russia.

Remarks. Chistyakovella gen. nov. can clearly be distinguished from all the other genera of Carabodoidea by the following apomorphic character: lamellae touching medially, forming a triangular interlamellar region (versus lamellae well separated medially, often connected by a translamella, not forming a clear, triangular interlamellar region).

The new genus is most similar in appearance to representatives of the genera Gibbicepheus Balogh, 1958 and Diplobodes Aoki, 1958 , with which it shares large lamellae, located dorso-laterally; prodorsum without apophyses; 15 pairs of notogastral setae, which are removed from each other; notogaster with large apophyses; setation of ventral plate. However, it can clearly be distinguished from both genera by the following characters (in addition to the morphology of lamellae): 1) position of interlamellar setae mediodistally on lamellae (some representatives of Gibbicepheus — G. baccanensis Jeleva & Vu, 1987 from Vietnam, G. chinensis Wen, 1992 from China, G. fenestralis Hammer, 1979 and G. ventrostriatus Hammer, 1979 , both from Java Island,—also have interlamellar setae positioned mediodistally, but in the interlamellar region, not on the lamellae,); 2) two pairs notogastral setae (c 2, c 3) inserted close to humeral regions (versus without setae in Gibbicepheus ; without or with one pair of setae in Diplobodes ). Also, rostral setae of Chistyakovella gen. nov. are inserted on rostrum (only G. baccanensis has similar insertions of these setae; other species of Gibbicepheus and Diplobodes have rostral setae inserted on lamellae).

FIGURES 4–10. Chistyakovella insolita sp. nov.: 4—distal part of lamellae and lamellar setae, dorso-anterior view; 5—posterior view; 6—rostral and lamellar setae, dorso-lateral view; 7—interlamellar seta; 8—sensillus; 9—tubercles in central part of notogaster; 10—notogastral seta p 2. Scale bars (4) 20 μm, (5) 50 μm, (6–10) 10 μm.

FIGURES 11–17. Chistyakovella insolita sp. nov.: 11—subcapitulum, right half; 12—palp; 13—chelicera, anterior part; 14—epimeral seta 1b; 15—genital plate, right; 16—anal plate, right; 17—adanal seta ad 2. Scale bars (11) 20 μm, (12–17) 10 μm.