Eurostocepheus (Eurostocepheus) aquilinus Aoki, 1965

Zheng, Lihao & Chen, Jun, 2021, Two new species and new records of Otocepheidae (Acari, Oribatida) from Yunnan, Southwest China, ZooKeys 1073, pp. 177-199 : 177

Eurostocepheus (Eurostocepheus) aquilinus Aoki, 1965

New record for China Figures 9 , 10

Eurostocepheus aquilinus Aoki, 1965: 334-339, figs 142-146; Ermilov, Niedbała and Anichkin 2012: 23.

Diagnosis.

Body size: 1000 × 510. Body ratio (length/width): 2.0. Costula strong, thin anteriorly, and thick posteriorly. Lamelliform expansion sigmoid and passing between base of setae ro and le in lateral view. Ten pairs of notogastral setae nearly equal in length. Sternal apodeme short and rounded. Epimeral setal formula 3-1-3-2. Epimeral setae slightly barbed, seta 1a, 2a, 3a short and thin, hardly visible.

Description.

Measurements (ZLH-20-029, male). Body length: 1000, body width: 510. Setae length and mutual distance: ro 130, le 140, bs 150, in 60, ex 20; notogastral setae range 70-110. Mutual distance: c - c 140, la - la 190, lm - lm 210, lp - lp 310, h 2- h 2 220, h 1- h 1 210.

Integument. Body color dark brownish. Body surface covered with foveola.

Prodorsum. Rostrum rounded. Both rostral setae and lamellar setae curved inward, slightly barbed outside. Lamellar setae inserted behind tip of costula. Interlamellar setae slightly barbed. Bothridial setae with a long fusiform head and a curved peduncle. Exobothridial setae short, hard to see in dorsal view. Costula strong, thin anteriorly, and thick posteriorly. Bothridium opening laterally, dorsal bothridial plate nearly straight, ventral bothridial plate invisible in dorsal view. Tutorium fainted. Lamelliform expansion sigmoid and passing between bases of setae ro and le in lateral view. Lateral prodorsal condyles broadly rounded, median prodorsal condyles absent. Mutual distance between ventral bothridial plate nearly equal with that between lateral prodorsal condyles.

Notogaster. L/W of notogaster about 1.3. Lateral notogastral condyles triangular. Median notogastral condyles absent. Ten pairs of notogastral setae nearly equal in length. All lyrifissures well visible, ip located between p 2 and p 3, ips between h 3 and p 3. Opisthonotal gland openings located close to lyrifissure im. Vitta marginalis distinct. Lyrifissures im and setae lm located nearly same level.

Epimeral and lateral podosomal regions. Epimere I with distinct, long ridge extend to pedotectum I. Apodemes I, II and sejugal apodeme well developed. Sternal apodeme short and rounded. Epimeral setal formula 3-1-3-2. Epimeral setae slightly barbed, seta 1a, 2a, 3a short and thin, hardly visible.

Anogenital region. Genital plates sculptured irregularly with several strong furrows. Four pairs of genital setae (largest mutual distance is g 3- g 3). Aggenital lyrifissures located close and anterolateral to genital aperture. One pair of aggenital, two pairs of anal (mutual distances an 1- an 1<an 2- an 2) and three pairs of adanal setae similar in length. Setae ad 3- ad 3 below level of anterior margin of anal opening. Adanal lyrifissures located longitudinally and close to anal aperture, below level of anterior margin of anal opening.

Gnathosoma. Subcapitular setae barbed. Rutellum pantelobasic, with typical dentation and rutellar brush. Chelicera chelate-dentate; with a minute denticle proximal to seta cha; cha longer than chb; Trägårdh’s organ narrowly triangular. Palp with usual setal formula: 0-2-1-3-8 (+ ω); setae of trochanter to tibia barbed. Tarsus with four short, blunt distal eupathidia- acm, su, (ul); base solenidion ω constrainted by surface of tarsus, and thus adjacent to setae ul ', ul " medioanteriorly. Postpalpal setae erect, smooth.

Legs. Monodactylous. Claw of each leg strong and smooth. Formulae of leg setation and solenidia (Table 2 ): I (1-4-3-4-16) [1-2-2], II (1-4-3-3-15) [1-1-2], III (1-2-1-2-15) [1-1-0], IV (0-2-2-2-12) [0-1-0]. Leg setae u setiform (L-type) on tarsi I, thorn-like (S-type) on tarsi II-IV.

Material examined.

One male (in alcohol, ZLH-20-029): China, Yunnan Province, Ruili County, Nongdao Town , Nankaiba , 23°55'49"N, 97°32'7"E, 752 m a. s. l., litter and soil under fern, 25 May 2020, collected by Lihao Zheng.

Specimen deposition.

Specimen is deposited in the collection of the IZAS.

Remarks.

The specimen checked in this study is almost coincident (shape of lamelliform expansion, different kind of epimeral setae in shape, etc.) with the original description given by Aoki. Here, we provide a supplementary description of this species with new figures and information about morphological characters of this species.

Figures

Figure 9. Eurostocepheus (Eurostocepheus) aquilinus Aoki, 1965, adult: a dorsal aspect (legs removed) b ventral aspect (legs and mouthparts removed). Abbreviations and notations explained in text. Scale bars: 200 µm.

Figure 10. Eurostocepheus (Eurostocepheus) aquilinus Aoki, 1965, adult, microscope images: a dorsal view b ventral view c lateral view. Abbreviations and notations explained in text. Scale bars: 200 µm.